move encoding methods to shared classes

1 files changed, 1677 insertions, 0 deletions

diff --git a/MediaBrowser.MediaEncoding/Encoder/EncodingHelper.cs b/MediaBrowser.MediaEncoding/Encoder/EncodingHelper.cs
new file mode 100644
index 000000000..09b842630
--- /dev/null
+++ b/MediaBrowser.MediaEncoding/Encoder/EncodingHelper.cs
@@ -0,0 +1,1677 @@
+using System;
+using System.Collections.Generic;
+using System.Globalization;
+using System.IO;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using MediaBrowser.Common.Configuration;
+using MediaBrowser.Controller.Configuration;
+using MediaBrowser.Controller.Library;
+using MediaBrowser.Controller.MediaEncoding;
+using MediaBrowser.Model.Configuration;
+using MediaBrowser.Model.Dlna;
+using MediaBrowser.Model.Dto;
+using MediaBrowser.Model.Entities;
+using MediaBrowser.Model.IO;
+using MediaBrowser.Model.Logging;
+using MediaBrowser.Model.MediaInfo;
+
+namespace MediaBrowser.MediaEncoding.Encoder
+{
+    public class EncodingHelper
+    {
+        private readonly CultureInfo _usCulture = new CultureInfo("en-US");
+
+        private readonly IMediaEncoder _mediaEncoder;
+        private readonly IServerConfigurationManager _config;
+        private readonly IFileSystem _fileSystem;
+        private readonly ISubtitleEncoder _subtitleEncoder;
+
+        public EncodingHelper(IMediaEncoder mediaEncoder, IServerConfigurationManager config, IFileSystem fileSystem, ISubtitleEncoder subtitleEncoder)
+        {
+            _mediaEncoder = mediaEncoder;
+            _config = config;
+            _fileSystem = fileSystem;
+            _subtitleEncoder = subtitleEncoder;
+        }
+
+        public string GetH264Encoder(EncodingJobInfo state, EncodingOptions encodingOptions)
+        {
+            var defaultEncoder = "libx264";
+
+            // Only use alternative encoders for video files.
+            // When using concat with folder rips, if the mfx session fails to initialize, ffmpeg will be stuck retrying and will not exit gracefully
+            // Since transcoding of folder rips is expiremental anyway, it's not worth adding additional variables such as this.
+            if (state.VideoType == VideoType.VideoFile)
+            {
+                var hwType = encodingOptions.HardwareAccelerationType;
+
+                if (string.Equals(hwType, "qsv", StringComparison.OrdinalIgnoreCase) ||
+                    string.Equals(hwType, "h264_qsv", StringComparison.OrdinalIgnoreCase))
+                {
+                    return GetAvailableEncoder("h264_qsv", defaultEncoder);
+                }
+
+                if (string.Equals(hwType, "nvenc", StringComparison.OrdinalIgnoreCase))
+                {
+                    return GetAvailableEncoder("h264_nvenc", defaultEncoder);
+                }
+                if (string.Equals(hwType, "h264_omx", StringComparison.OrdinalIgnoreCase))
+                {
+                    return GetAvailableEncoder("h264_omx", defaultEncoder);
+                }
+                if (string.Equals(hwType, "vaapi", StringComparison.OrdinalIgnoreCase) && !string.IsNullOrWhiteSpace(encodingOptions.VaapiDevice))
+                {
+                    if (IsVaapiSupported(state))
+                    {
+                        return GetAvailableEncoder("h264_vaapi", defaultEncoder);
+                    }
+                }
+            }
+
+            return defaultEncoder;
+        }
+
+        private string GetAvailableEncoder(string preferredEncoder, string defaultEncoder)
+        {
+            if (_mediaEncoder.SupportsEncoder(preferredEncoder))
+            {
+                return preferredEncoder;
+            }
+            return defaultEncoder;
+        }
+
+        private bool IsVaapiSupported(EncodingJobInfo state)
+        {
+            var videoStream = state.VideoStream;
+
+            if (videoStream != null)
+            {
+                // vaapi will throw an error with this input
+                // [vaapi @ 0x7faed8000960] No VAAPI support for codec mpeg4 profile -99.
+                if (string.Equals(videoStream.Codec, "mpeg4", StringComparison.OrdinalIgnoreCase))
+                {
+                    if (videoStream.Level == -99 || videoStream.Level == 15)
+                    {
+                        return false;
+                    }
+                }
+            }
+            return true;
+        }
+
+        /// <summary>
+        /// Gets the name of the output video codec
+        /// </summary>
+        public string GetVideoEncoder(EncodingJobInfo state, EncodingOptions encodingOptions)
+        {
+            var codec = state.OutputVideoCodec;
+
+            if (!string.IsNullOrEmpty(codec))
+            {
+                if (string.Equals(codec, "h264", StringComparison.OrdinalIgnoreCase))
+                {
+                    return GetH264Encoder(state, encodingOptions);
+                }
+                if (string.Equals(codec, "vpx", StringComparison.OrdinalIgnoreCase))
+                {
+                    return "libvpx";
+                }
+                if (string.Equals(codec, "wmv", StringComparison.OrdinalIgnoreCase))
+                {
+                    return "wmv2";
+                }
+                if (string.Equals(codec, "theora", StringComparison.OrdinalIgnoreCase))
+                {
+                    return "libtheora";
+                }
+
+                return codec.ToLower();
+            }
+
+            return "copy";
+        }
+
+        /// <summary>
+        /// Gets the user agent param.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <returns>System.String.</returns>
+        public string GetUserAgentParam(EncodingJobInfo state)
+        {
+            string useragent = null;
+
+            state.RemoteHttpHeaders.TryGetValue("User-Agent", out useragent);
+
+            if (!string.IsNullOrWhiteSpace(useragent))
+            {
+                return "-user-agent \"" + useragent + "\"";
+            }
+
+            return string.Empty;
+        }
+
+        public string GetInputFormat(string container)
+        {
+            if (string.Equals(container, "mkv", StringComparison.OrdinalIgnoreCase))
+            {
+                return "matroska";
+            }
+
+            return container;
+        }
+
+        public string GetDecoderFromCodec(string codec)
+        {
+            if (string.Equals(codec, "mp2", StringComparison.OrdinalIgnoreCase))
+            {
+                return null;
+            }
+            if (string.Equals(codec, "aac_latm", StringComparison.OrdinalIgnoreCase))
+            {
+                return null;
+            }
+
+            return codec;
+        }
+
+        /// <summary>
+        /// Infers the audio codec based on the url
+        /// </summary>
+        /// <param name="url">The URL.</param>
+        /// <returns>System.Nullable{AudioCodecs}.</returns>
+        public string InferAudioCodec(string url)
+        {
+            var ext = Path.GetExtension(url);
+
+            if (string.Equals(ext, ".mp3", StringComparison.OrdinalIgnoreCase))
+            {
+                return "mp3";
+            }
+            if (string.Equals(ext, ".aac", StringComparison.OrdinalIgnoreCase))
+            {
+                return "aac";
+            }
+            if (string.Equals(ext, ".wma", StringComparison.OrdinalIgnoreCase))
+            {
+                return "wma";
+            }
+            if (string.Equals(ext, ".ogg", StringComparison.OrdinalIgnoreCase))
+            {
+                return "vorbis";
+            }
+            if (string.Equals(ext, ".oga", StringComparison.OrdinalIgnoreCase))
+            {
+                return "vorbis";
+            }
+            if (string.Equals(ext, ".ogv", StringComparison.OrdinalIgnoreCase))
+            {
+                return "vorbis";
+            }
+            if (string.Equals(ext, ".webm", StringComparison.OrdinalIgnoreCase))
+            {
+                return "vorbis";
+            }
+            if (string.Equals(ext, ".webma", StringComparison.OrdinalIgnoreCase))
+            {
+                return "vorbis";
+            }
+
+            return "copy";
+        }
+
+        /// <summary>
+        /// Infers the video codec.
+        /// </summary>
+        /// <param name="url">The URL.</param>
+        /// <returns>System.Nullable{VideoCodecs}.</returns>
+        public string InferVideoCodec(string url)
+        {
+            var ext = Path.GetExtension(url);
+
+            if (string.Equals(ext, ".asf", StringComparison.OrdinalIgnoreCase))
+            {
+                return "wmv";
+            }
+            if (string.Equals(ext, ".webm", StringComparison.OrdinalIgnoreCase))
+            {
+                return "vpx";
+            }
+            if (string.Equals(ext, ".ogg", StringComparison.OrdinalIgnoreCase) || string.Equals(ext, ".ogv", StringComparison.OrdinalIgnoreCase))
+            {
+                return "theora";
+            }
+            if (string.Equals(ext, ".m3u8", StringComparison.OrdinalIgnoreCase) || string.Equals(ext, ".ts", StringComparison.OrdinalIgnoreCase))
+            {
+                return "h264";
+            }
+
+            return "copy";
+        }
+
+        public int GetVideoProfileScore(string profile)
+        {
+            var list = new List<string>
+            {
+                "Constrained Baseline",
+                "Baseline",
+                "Extended",
+                "Main",
+                "High",
+                "Progressive High",
+                "Constrained High"
+            };
+
+            return Array.FindIndex(list.ToArray(), t => string.Equals(t, profile, StringComparison.OrdinalIgnoreCase));
+        }
+
+        public string GetInputPathArgument(EncodingJobInfo state)
+        {
+            var protocol = state.InputProtocol;
+            var mediaPath = state.MediaPath ?? string.Empty;
+
+            var inputPath = new[] { mediaPath };
+
+            if (state.IsInputVideo)
+            {
+                if (!(state.VideoType == VideoType.Iso && state.IsoMount == null))
+                {
+                    inputPath = MediaEncoderHelpers.GetInputArgument(_fileSystem, mediaPath, state.InputProtocol, state.IsoMount, state.PlayableStreamFileNames);
+                }
+            }
+
+            return _mediaEncoder.GetInputArgument(inputPath, protocol);
+        }
+
+        /// <summary>
+        /// Gets the audio encoder.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <returns>System.String.</returns>
+        public string GetAudioEncoder(EncodingJobInfo state)
+        {
+            var codec = state.OutputAudioCodec;
+
+            if (string.Equals(codec, "aac", StringComparison.OrdinalIgnoreCase))
+            {
+                return "aac -strict experimental";
+            }
+            if (string.Equals(codec, "mp3", StringComparison.OrdinalIgnoreCase))
+            {
+                return "libmp3lame";
+            }
+            if (string.Equals(codec, "vorbis", StringComparison.OrdinalIgnoreCase))
+            {
+                return "libvorbis";
+            }
+            if (string.Equals(codec, "wma", StringComparison.OrdinalIgnoreCase))
+            {
+                return "wmav2";
+            }
+
+            return codec.ToLower();
+        }
+
+        /// <summary>
+        /// Gets the input argument.
+        /// </summary>
+        public string GetInputArgument(EncodingJobInfo state, EncodingOptions encodingOptions)
+        {
+            var request = state.BaseRequest;
+
+            var arg = string.Format("-i {0}", GetInputPathArgument(state));
+
+            if (state.SubtitleStream != null && request.SubtitleMethod == SubtitleDeliveryMethod.Encode)
+            {
+                if (state.SubtitleStream.IsExternal && !state.SubtitleStream.IsTextSubtitleStream)
+                {
+                    if (state.VideoStream != null && state.VideoStream.Width.HasValue)
+                    {
+                        // This is hacky but not sure how to get the exact subtitle resolution
+                        double height = state.VideoStream.Width.Value;
+                        height /= 16;
+                        height *= 9;
+
+                        arg += string.Format(" -canvas_size {0}:{1}", state.VideoStream.Width.Value.ToString(CultureInfo.InvariantCulture), Convert.ToInt32(height).ToString(CultureInfo.InvariantCulture));
+                    }
+
+                    var subtitlePath = state.SubtitleStream.Path;
+
+                    if (string.Equals(Path.GetExtension(subtitlePath), ".sub", StringComparison.OrdinalIgnoreCase))
+                    {
+                        var idxFile = Path.ChangeExtension(subtitlePath, ".idx");
+                        if (_fileSystem.FileExists(idxFile))
+                        {
+                            subtitlePath = idxFile;
+                        }
+                    }
+
+                    arg += " -i \"" + subtitlePath + "\"";
+                }
+            }
+
+            if (state.IsVideoRequest)
+            {
+                if (GetVideoEncoder(state, encodingOptions).IndexOf("vaapi", StringComparison.OrdinalIgnoreCase) != -1)
+                {
+                    var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsTextSubtitleStream && request.SubtitleMethod == SubtitleDeliveryMethod.Encode;
+                    var hwOutputFormat = "vaapi";
+
+                    if (hasGraphicalSubs)
+                    {
+                        hwOutputFormat = "yuv420p";
+                    }
+
+                    arg = "-hwaccel vaapi -hwaccel_output_format " + hwOutputFormat + " -vaapi_device " + encodingOptions.VaapiDevice + " " + arg;
+                }
+            }
+
+            return arg.Trim();
+        }
+
+        /// <summary>
+        /// Determines whether the specified stream is H264.
+        /// </summary>
+        /// <param name="stream">The stream.</param>
+        /// <returns><c>true</c> if the specified stream is H264; otherwise, <c>false</c>.</returns>
+        public bool IsH264(MediaStream stream)
+        {
+            var codec = stream.Codec ?? string.Empty;
+
+            return codec.IndexOf("264", StringComparison.OrdinalIgnoreCase) != -1 ||
+                   codec.IndexOf("avc", StringComparison.OrdinalIgnoreCase) != -1;
+        }
+
+        public string GetVideoBitrateParam(EncodingJobInfo state, string videoCodec)
+        {
+            var bitrate = state.OutputVideoBitrate;
+
+            if (bitrate.HasValue)
+            {
+                if (string.Equals(videoCodec, "libvpx", StringComparison.OrdinalIgnoreCase))
+                {
+                    // With vpx when crf is used, b:v becomes a max rate
+                    // https://trac.ffmpeg.org/wiki/vpxEncodingGuide. But higher bitrate source files -b:v causes judder so limite the bitrate but dont allow it to "saturate" the bitrate. So dont contrain it down just up.
+                    return string.Format(" -maxrate:v {0} -bufsize:v ({0}*2) -b:v {0}", bitrate.Value.ToString(_usCulture));
+                }
+
+                if (string.Equals(videoCodec, "msmpeg4", StringComparison.OrdinalIgnoreCase))
+                {
+                    return string.Format(" -b:v {0}", bitrate.Value.ToString(_usCulture));
+                }
+
+                if (string.Equals(videoCodec, "libx264", StringComparison.OrdinalIgnoreCase))
+                {
+                    // h264
+                    return string.Format(" -maxrate {0} -bufsize {1}",
+                        bitrate.Value.ToString(_usCulture),
+                        (bitrate.Value * 2).ToString(_usCulture));
+                }
+
+                // h264
+                return string.Format(" -b:v {0} -maxrate {0} -bufsize {1}",
+                    bitrate.Value.ToString(_usCulture),
+                    (bitrate.Value * 2).ToString(_usCulture));
+            }
+
+            return string.Empty;
+        }
+
+        public string NormalizeTranscodingLevel(string videoCodec, string level)
+        {
+            double requestLevel;
+
+            // Clients may direct play higher than level 41, but there's no reason to transcode higher
+            if (double.TryParse(level, NumberStyles.Any, _usCulture, out requestLevel))
+            {
+                if (string.Equals(videoCodec, "h264", StringComparison.OrdinalIgnoreCase))
+                {
+                    if (requestLevel > 41)
+                    {
+                        return "41";
+                    }
+                }
+            }
+
+            return level;
+        }
+
+        /// <summary>
+        /// Gets the probe size argument.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <returns>System.String.</returns>
+        public string GetProbeSizeArgument(EncodingJobInfo state)
+        {
+            if (state.PlayableStreamFileNames.Count > 0)
+            {
+                return _mediaEncoder.GetProbeSizeAndAnalyzeDurationArgument(state.PlayableStreamFileNames.ToArray(), state.InputProtocol);
+            }
+            
+            return _mediaEncoder.GetProbeSizeAndAnalyzeDurationArgument(new[] { state.MediaPath }, state.InputProtocol);
+        }
+
+        /// <summary>
+        /// Gets the text subtitle param.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <returns>System.String.</returns>
+        public string GetTextSubtitleParam(EncodingJobInfo state)
+        {
+            var seconds = Math.Round(TimeSpan.FromTicks(state.StartTimeTicks ?? 0).TotalSeconds);
+
+            var setPtsParam = state.CopyTimestamps
+                ? string.Empty
+                : string.Format(",setpts=PTS -{0}/TB", seconds.ToString(_usCulture));
+
+            if (state.SubtitleStream.IsExternal)
+            {
+                var subtitlePath = state.SubtitleStream.Path;
+
+                var charsetParam = string.Empty;
+
+                if (!string.IsNullOrEmpty(state.SubtitleStream.Language))
+                {
+                    var charenc = _subtitleEncoder.GetSubtitleFileCharacterSet(subtitlePath, state.SubtitleStream.Language, state.MediaSource.Protocol, CancellationToken.None).Result;
+
+                    if (!string.IsNullOrEmpty(charenc))
+                    {
+                        charsetParam = ":charenc=" + charenc;
+                    }
+                }
+
+                // TODO: Perhaps also use original_size=1920x800 ??
+                return string.Format("subtitles=filename='{0}'{1}{2}",
+                    _mediaEncoder.EscapeSubtitleFilterPath(subtitlePath),
+                    charsetParam,
+                    setPtsParam);
+            }
+
+            var mediaPath = state.MediaPath ?? string.Empty;
+
+            return string.Format("subtitles='{0}:si={1}'{2}",
+                _mediaEncoder.EscapeSubtitleFilterPath(mediaPath),
+                state.InternalSubtitleStreamOffset.ToString(_usCulture),
+                setPtsParam);
+        }
+
+        public double? GetFramerateParam(EncodingJobInfo state)
+        {
+            var request = state.BaseRequest;
+
+            if (request.Framerate.HasValue)
+            {
+                return request.Framerate.Value;
+            }
+
+            var maxrate = request.MaxFramerate;
+
+            if (maxrate.HasValue && state.VideoStream != null)
+            {
+                var contentRate = state.VideoStream.AverageFrameRate ?? state.VideoStream.RealFrameRate;
+
+                if (contentRate.HasValue && contentRate.Value > maxrate.Value)
+                {
+                    return maxrate;
+                }
+            }
+
+            return null;
+        }
+
+        /// <summary>
+        /// Gets the video bitrate to specify on the command line
+        /// </summary>
+        public string GetVideoQualityParam(EncodingJobInfo state, string videoEncoder, EncodingOptions encodingOptions, string defaultH264Preset)
+        {
+            var param = string.Empty;
+
+            var isVc1 = state.VideoStream != null &&
+                string.Equals(state.VideoStream.Codec, "vc1", StringComparison.OrdinalIgnoreCase);
+
+            if (string.Equals(videoEncoder, "libx264", StringComparison.OrdinalIgnoreCase))
+            {
+                if (!string.IsNullOrWhiteSpace(encodingOptions.H264Preset))
+                {
+                    param += "-preset " + encodingOptions.H264Preset;
+                }
+                else
+                {
+                    param += "-preset " + defaultH264Preset;
+                }
+
+                if (encodingOptions.H264Crf >= 0 && encodingOptions.H264Crf <= 51)
+                {
+                    param += " -crf " + encodingOptions.H264Crf.ToString(CultureInfo.InvariantCulture);
+                }
+                else
+                {
+                    param += " -crf 23";
+                }
+            }
+
+            else if (string.Equals(videoEncoder, "libx265", StringComparison.OrdinalIgnoreCase))
+            {
+                param += "-preset fast";
+
+                param += " -crf 28";
+            }
+
+            // h264 (h264_qsv)
+            else if (string.Equals(videoEncoder, "h264_qsv", StringComparison.OrdinalIgnoreCase))
+            {
+                param += "-preset 7 -look_ahead 0";
+
+            }
+
+            // h264 (h264_nvenc)
+            else if (string.Equals(videoEncoder, "h264_nvenc", StringComparison.OrdinalIgnoreCase))
+            {
+                param += "-preset default";
+            }
+
+            // webm
+            else if (string.Equals(videoEncoder, "libvpx", StringComparison.OrdinalIgnoreCase))
+            {
+                // Values 0-3, 0 being highest quality but slower
+                var profileScore = 0;
+
+                string crf;
+                var qmin = "0";
+                var qmax = "50";
+
+                crf = "10";
+
+                if (isVc1)
+                {
+                    profileScore++;
+                }
+
+                // Max of 2
+                profileScore = Math.Min(profileScore, 2);
+
+                // http://www.webmproject.org/docs/encoder-parameters/
+                param += string.Format("-speed 16 -quality good -profile:v {0} -slices 8 -crf {1} -qmin {2} -qmax {3}",
+                    profileScore.ToString(_usCulture),
+                    crf,
+                    qmin,
+                    qmax);
+            }
+
+            else if (string.Equals(videoEncoder, "mpeg4", StringComparison.OrdinalIgnoreCase))
+            {
+                param += "-mbd rd -flags +mv4+aic -trellis 2 -cmp 2 -subcmp 2 -bf 2";
+            }
+
+            // asf/wmv
+            else if (string.Equals(videoEncoder, "wmv2", StringComparison.OrdinalIgnoreCase))
+            {
+                param += "-qmin 2";
+            }
+
+            else if (string.Equals(videoEncoder, "msmpeg4", StringComparison.OrdinalIgnoreCase))
+            {
+                param += "-mbd 2";
+            }
+
+            param += GetVideoBitrateParam(state, videoEncoder);
+
+            var framerate = GetFramerateParam(state);
+            if (framerate.HasValue)
+            {
+                param += string.Format(" -r {0}", framerate.Value.ToString(_usCulture));
+            }
+
+            if (!string.IsNullOrEmpty(state.OutputVideoSync))
+            {
+                param += " -vsync " + state.OutputVideoSync;
+            }
+
+            var request = state.BaseRequest;
+
+            if (!string.IsNullOrEmpty(request.Profile))
+            {
+                if (!string.Equals(videoEncoder, "h264_omx", StringComparison.OrdinalIgnoreCase) &&
+                    !string.Equals(videoEncoder, "h264_vaapi", StringComparison.OrdinalIgnoreCase))
+                {
+                    // not supported by h264_omx
+                    param += " -profile:v " + request.Profile;
+                }
+            }
+
+            if (!string.IsNullOrEmpty(request.Level))
+            {
+                var level = NormalizeTranscodingLevel(state.OutputVideoCodec, request.Level);
+
+                // h264_qsv and h264_nvenc expect levels to be expressed as a decimal. libx264 supports decimal and non-decimal format
+                // also needed for libx264 due to https://trac.ffmpeg.org/ticket/3307
+                if (string.Equals(videoEncoder, "h264_qsv", StringComparison.OrdinalIgnoreCase) ||
+                    string.Equals(videoEncoder, "h264_nvenc", StringComparison.OrdinalIgnoreCase) ||
+                    string.Equals(videoEncoder, "libx264", StringComparison.OrdinalIgnoreCase))
+                {
+                    switch (level)
+                    {
+                        case "30":
+                            param += " -level 3.0";
+                            break;
+                        case "31":
+                            param += " -level 3.1";
+                            break;
+                        case "32":
+                            param += " -level 3.2";
+                            break;
+                        case "40":
+                            param += " -level 4.0";
+                            break;
+                        case "41":
+                            param += " -level 4.1";
+                            break;
+                        case "42":
+                            param += " -level 4.2";
+                            break;
+                        case "50":
+                            param += " -level 5.0";
+                            break;
+                        case "51":
+                            param += " -level 5.1";
+                            break;
+                        case "52":
+                            param += " -level 5.2";
+                            break;
+                        default:
+                            param += " -level " + level;
+                            break;
+                    }
+                }
+                else if (!string.Equals(videoEncoder, "h264_omx", StringComparison.OrdinalIgnoreCase))
+                {
+                    param += " -level " + level;
+                }
+            }
+
+            if (string.Equals(videoEncoder, "libx264", StringComparison.OrdinalIgnoreCase))
+            {
+                param += " -x264opts:0 subme=0:rc_lookahead=10:me_range=4:me=dia:no_chroma_me:8x8dct=0:partitions=none";
+            }
+
+            if (!string.Equals(videoEncoder, "h264_omx", StringComparison.OrdinalIgnoreCase) &&
+                !string.Equals(videoEncoder, "h264_qsv", StringComparison.OrdinalIgnoreCase) &&
+                !string.Equals(videoEncoder, "h264_vaapi", StringComparison.OrdinalIgnoreCase))
+            {
+                param = "-pix_fmt yuv420p " + param;
+            }
+
+            return param;
+        }
+
+        public bool CanStreamCopyVideo(EncodingJobInfo state, MediaStream videoStream)
+        {
+            var request = state.BaseRequest;
+
+            if (videoStream.IsInterlaced)
+            {
+                return false;
+            }
+
+            if (videoStream.IsAnamorphic ?? false)
+            {
+                return false;
+            }
+
+            // Can't stream copy if we're burning in subtitles
+            if (request.SubtitleStreamIndex.HasValue)
+            {
+                if (request.SubtitleMethod == SubtitleDeliveryMethod.Encode)
+                {
+                    return false;
+                }
+            }
+
+            if (string.Equals("h264", videoStream.Codec, StringComparison.OrdinalIgnoreCase))
+            {
+                if (videoStream.IsAVC.HasValue && !videoStream.IsAVC.Value && request.RequireAvc)
+                {
+                    return false;
+                }
+            }
+
+            // Source and target codecs must match
+            if (string.IsNullOrEmpty(videoStream.Codec) || !state.SupportedVideoCodecs.Contains(videoStream.Codec, StringComparer.OrdinalIgnoreCase))
+            {
+                return false;
+            }
+
+            // If client is requesting a specific video profile, it must match the source
+            if (!string.IsNullOrEmpty(request.Profile))
+            {
+                if (string.IsNullOrEmpty(videoStream.Profile))
+                {
+                    //return false;
+                }
+
+                if (!string.IsNullOrEmpty(videoStream.Profile) && !string.Equals(request.Profile, videoStream.Profile, StringComparison.OrdinalIgnoreCase))
+                {
+                    var currentScore = GetVideoProfileScore(videoStream.Profile);
+                    var requestedScore = GetVideoProfileScore(request.Profile);
+
+                    if (currentScore == -1 || currentScore > requestedScore)
+                    {
+                        return false;
+                    }
+                }
+            }
+
+            // Video width must fall within requested value
+            if (request.MaxWidth.HasValue)
+            {
+                if (!videoStream.Width.HasValue || videoStream.Width.Value > request.MaxWidth.Value)
+                {
+                    return false;
+                }
+            }
+
+            // Video height must fall within requested value
+            if (request.MaxHeight.HasValue)
+            {
+                if (!videoStream.Height.HasValue || videoStream.Height.Value > request.MaxHeight.Value)
+                {
+                    return false;
+                }
+            }
+
+            // Video framerate must fall within requested value
+            var requestedFramerate = request.MaxFramerate ?? request.Framerate;
+            if (requestedFramerate.HasValue)
+            {
+                var videoFrameRate = videoStream.AverageFrameRate ?? videoStream.RealFrameRate;
+
+                if (!videoFrameRate.HasValue || videoFrameRate.Value > requestedFramerate.Value)
+                {
+                    return false;
+                }
+            }
+
+            // Video bitrate must fall within requested value
+            if (request.VideoBitRate.HasValue)
+            {
+                if (!videoStream.BitRate.HasValue || videoStream.BitRate.Value > request.VideoBitRate.Value)
+                {
+                    return false;
+                }
+            }
+
+            if (request.MaxVideoBitDepth.HasValue)
+            {
+                if (videoStream.BitDepth.HasValue && videoStream.BitDepth.Value > request.MaxVideoBitDepth.Value)
+                {
+                    return false;
+                }
+            }
+
+            if (request.MaxRefFrames.HasValue)
+            {
+                if (videoStream.RefFrames.HasValue && videoStream.RefFrames.Value > request.MaxRefFrames.Value)
+                {
+                    return false;
+                }
+            }
+
+            // If a specific level was requested, the source must match or be less than
+            if (!string.IsNullOrEmpty(request.Level))
+            {
+                double requestLevel;
+
+                if (double.TryParse(request.Level, NumberStyles.Any, _usCulture, out requestLevel))
+                {
+                    if (!videoStream.Level.HasValue)
+                    {
+                        //return false;
+                    }
+
+                    if (videoStream.Level.HasValue && videoStream.Level.Value > requestLevel)
+                    {
+                        return false;
+                    }
+                }
+            }
+
+            return request.EnableAutoStreamCopy;
+        }
+
+        public bool CanStreamCopyAudio(EncodingJobInfo state, MediaStream audioStream, List<string> supportedAudioCodecs)
+        {
+            var request = state.BaseRequest;
+
+            // Source and target codecs must match
+            if (string.IsNullOrEmpty(audioStream.Codec) || !supportedAudioCodecs.Contains(audioStream.Codec, StringComparer.OrdinalIgnoreCase))
+            {
+                return false;
+            }
+
+            // Video bitrate must fall within requested value
+            if (request.AudioBitRate.HasValue)
+            {
+                if (!audioStream.BitRate.HasValue || audioStream.BitRate.Value <= 0)
+                {
+                    return false;
+                }
+                if (audioStream.BitRate.Value > request.AudioBitRate.Value)
+                {
+                    return false;
+                }
+            }
+
+            // Channels must fall within requested value
+            var channels = request.AudioChannels ?? request.MaxAudioChannels;
+            if (channels.HasValue)
+            {
+                if (!audioStream.Channels.HasValue || audioStream.Channels.Value <= 0)
+                {
+                    return false;
+                }
+                if (audioStream.Channels.Value > channels.Value)
+                {
+                    return false;
+                }
+            }
+
+            // Sample rate must fall within requested value
+            if (request.AudioSampleRate.HasValue)
+            {
+                if (!audioStream.SampleRate.HasValue || audioStream.SampleRate.Value <= 0)
+                {
+                    return false;
+                }
+                if (audioStream.SampleRate.Value > request.AudioSampleRate.Value)
+                {
+                    return false;
+                }
+            }
+
+            return request.EnableAutoStreamCopy;
+        }
+
+        public int? GetVideoBitrateParamValue(BaseEncodingJobOptions request, MediaStream videoStream, string outputVideoCodec)
+        {
+            var bitrate = request.VideoBitRate;
+
+            if (videoStream != null)
+            {
+                var isUpscaling = request.Height.HasValue && videoStream.Height.HasValue &&
+                                   request.Height.Value > videoStream.Height.Value;
+
+                if (request.Width.HasValue && videoStream.Width.HasValue &&
+                    request.Width.Value > videoStream.Width.Value)
+                {
+                    isUpscaling = true;
+                }
+
+                // Don't allow bitrate increases unless upscaling
+                if (!isUpscaling)
+                {
+                    if (bitrate.HasValue && videoStream.BitRate.HasValue)
+                    {
+                        bitrate = Math.Min(bitrate.Value, videoStream.BitRate.Value);
+                    }
+                }
+            }
+
+            if (bitrate.HasValue)
+            {
+                var inputVideoCodec = videoStream == null ? null : videoStream.Codec;
+                bitrate = ResolutionNormalizer.ScaleBitrate(bitrate.Value, inputVideoCodec, outputVideoCodec);
+
+                // If a max bitrate was requested, don't let the scaled bitrate exceed it
+                if (request.VideoBitRate.HasValue)
+                {
+                    bitrate = Math.Min(bitrate.Value, request.VideoBitRate.Value);
+                }
+            }
+
+            return bitrate;
+        }
+
+        public int? GetAudioBitrateParam(BaseEncodingJobOptions request, MediaStream audioStream)
+        {
+            if (request.AudioBitRate.HasValue)
+            {
+                // Make sure we don't request a bitrate higher than the source
+                var currentBitrate = audioStream == null ? request.AudioBitRate.Value : audioStream.BitRate ?? request.AudioBitRate.Value;
+
+                // Don't encode any higher than this
+                return Math.Min(384000, request.AudioBitRate.Value);
+                //return Math.Min(currentBitrate, request.AudioBitRate.Value);
+            }
+
+            return null;
+        }
+
+        public string GetAudioFilterParam(EncodingJobInfo state, EncodingOptions encodingOptions, bool isHls)
+        {
+            var volParam = string.Empty;
+            var audioSampleRate = string.Empty;
+
+            var channels = state.OutputAudioChannels;
+
+            // Boost volume to 200% when downsampling from 6ch to 2ch
+            if (channels.HasValue && channels.Value <= 2)
+            {
+                if (state.AudioStream != null && state.AudioStream.Channels.HasValue && state.AudioStream.Channels.Value > 5 && !encodingOptions.DownMixAudioBoost.Equals(1))
+                {
+                    volParam = ",volume=" + encodingOptions.DownMixAudioBoost.ToString(_usCulture);
+                }
+            }
+
+            if (state.OutputAudioSampleRate.HasValue)
+            {
+                audioSampleRate = state.OutputAudioSampleRate.Value + ":";
+            }
+
+            var adelay = isHls ? "adelay=1," : string.Empty;
+
+            var pts = string.Empty;
+
+            if (state.SubtitleStream != null && state.SubtitleStream.IsTextSubtitleStream && state.BaseRequest.SubtitleMethod == SubtitleDeliveryMethod.Encode && !state.CopyTimestamps)
+            {
+                var seconds = TimeSpan.FromTicks(state.StartTimeTicks ?? 0).TotalSeconds;
+
+                pts = string.Format(",asetpts=PTS-{0}/TB", Math.Round(seconds).ToString(_usCulture));
+            }
+
+            return string.Format("-af \"{0}aresample={1}async={4}{2}{3}\"",
+
+                adelay,
+                audioSampleRate,
+                volParam,
+                pts,
+                state.OutputAudioSync);
+        }
+
+        /// <summary>
+        /// Gets the number of audio channels to specify on the command line
+        /// </summary>
+        /// <param name="request">The request.</param>
+        /// <param name="audioStream">The audio stream.</param>
+        /// <param name="outputAudioCodec">The output audio codec.</param>
+        /// <returns>System.Nullable{System.Int32}.</returns>
+        public int? GetNumAudioChannelsParam(BaseEncodingJobOptions request, MediaStream audioStream, string outputAudioCodec)
+        {
+            var inputChannels = audioStream == null
+                ? null
+                : audioStream.Channels;
+
+            if (inputChannels <= 0)
+            {
+                inputChannels = null;
+            }
+
+            int? transcoderChannelLimit = null;
+            var codec = outputAudioCodec ?? string.Empty;
+
+            if (codec.IndexOf("wma", StringComparison.OrdinalIgnoreCase) != -1)
+            {
+                // wmav2 currently only supports two channel output
+                transcoderChannelLimit = 2;
+            }
+
+            else if (codec.IndexOf("mp3", StringComparison.OrdinalIgnoreCase) != -1)
+            {
+                // libmp3lame currently only supports two channel output
+                transcoderChannelLimit = 2;
+            }
+            else
+            {
+                // If we don't have any media info then limit it to 6 to prevent encoding errors due to asking for too many channels
+                transcoderChannelLimit = 6;
+            }
+
+            var isTranscodingAudio = !string.Equals(codec, "copy", StringComparison.OrdinalIgnoreCase);
+
+            int? resultChannels = null;
+            if (isTranscodingAudio)
+            {
+                resultChannels = request.TranscodingMaxAudioChannels;
+            }
+            resultChannels = resultChannels ?? request.MaxAudioChannels ?? request.AudioChannels;
+
+            if (inputChannels.HasValue)
+            {
+                resultChannels = resultChannels.HasValue
+                    ? Math.Min(resultChannels.Value, inputChannels.Value)
+                    : inputChannels.Value;
+            }
+
+            if (isTranscodingAudio && transcoderChannelLimit.HasValue)
+            {
+                resultChannels = resultChannels.HasValue
+                    ? Math.Min(resultChannels.Value, transcoderChannelLimit.Value)
+                    : transcoderChannelLimit.Value;
+            }
+
+            return resultChannels ?? request.AudioChannels;
+        }
+
+        /// <summary>
+        /// Enforces the resolution limit.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        public void EnforceResolutionLimit(EncodingJobInfo state)
+        {
+            var videoRequest = state.BaseRequest;
+
+            // Switch the incoming params to be ceilings rather than fixed values
+            videoRequest.MaxWidth = videoRequest.MaxWidth ?? videoRequest.Width;
+            videoRequest.MaxHeight = videoRequest.MaxHeight ?? videoRequest.Height;
+
+            videoRequest.Width = null;
+            videoRequest.Height = null;
+        }
+
+        /// <summary>
+        /// Gets the fast seek command line parameter.
+        /// </summary>
+        /// <param name="request">The request.</param>
+        /// <returns>System.String.</returns>
+        /// <value>The fast seek command line parameter.</value>
+        public string GetFastSeekCommandLineParameter(BaseEncodingJobOptions request)
+        {
+            var time = request.StartTimeTicks ?? 0;
+
+            if (time > 0)
+            {
+                return string.Format("-ss {0}", _mediaEncoder.GetTimeParameter(time));
+            }
+
+            return string.Empty;
+        }
+
+        /// <summary>
+        /// Gets the map args.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <returns>System.String.</returns>
+        public string GetMapArgs(EncodingJobInfo state)
+        {
+            // If we don't have known media info
+            // If input is video, use -sn to drop subtitles
+            // Otherwise just return empty
+            if (state.VideoStream == null && state.AudioStream == null)
+            {
+                return state.IsInputVideo ? "-sn" : string.Empty;
+            }
+
+            // We have media info, but we don't know the stream indexes
+            if (state.VideoStream != null && state.VideoStream.Index == -1)
+            {
+                return "-sn";
+            }
+
+            // We have media info, but we don't know the stream indexes
+            if (state.AudioStream != null && state.AudioStream.Index == -1)
+            {
+                return state.IsInputVideo ? "-sn" : string.Empty;
+            }
+
+            var args = string.Empty;
+
+            if (state.VideoStream != null)
+            {
+                args += string.Format("-map 0:{0}", state.VideoStream.Index);
+            }
+            else
+            {
+                // No known video stream
+                args += "-vn";
+            }
+
+            if (state.AudioStream != null)
+            {
+                args += string.Format(" -map 0:{0}", state.AudioStream.Index);
+            }
+
+            else
+            {
+                args += " -map -0:a";
+            }
+
+            var subtitleMethod = state.BaseRequest.SubtitleMethod;
+            if (state.SubtitleStream == null || subtitleMethod == SubtitleDeliveryMethod.Hls)
+            {
+                args += " -map -0:s";
+            }
+            else if (subtitleMethod == SubtitleDeliveryMethod.Embed)
+            {
+                args += string.Format(" -map 0:{0}", state.SubtitleStream.Index);
+            }
+            else if (state.SubtitleStream.IsExternal && !state.SubtitleStream.IsTextSubtitleStream)
+            {
+                args += " -map 1:0 -sn";
+            }
+
+            return args;
+        }
+
+        /// <summary>
+        /// Determines which stream will be used for playback
+        /// </summary>
+        /// <param name="allStream">All stream.</param>
+        /// <param name="desiredIndex">Index of the desired.</param>
+        /// <param name="type">The type.</param>
+        /// <param name="returnFirstIfNoIndex">if set to <c>true</c> [return first if no index].</param>
+        /// <returns>MediaStream.</returns>
+        public MediaStream GetMediaStream(IEnumerable<MediaStream> allStream, int? desiredIndex, MediaStreamType type, bool returnFirstIfNoIndex = true)
+        {
+            var streams = allStream.Where(s => s.Type == type).OrderBy(i => i.Index).ToList();
+
+            if (desiredIndex.HasValue)
+            {
+                var stream = streams.FirstOrDefault(s => s.Index == desiredIndex.Value);
+
+                if (stream != null)
+                {
+                    return stream;
+                }
+            }
+
+            if (type == MediaStreamType.Video)
+            {
+                streams = streams.Where(i => !string.Equals(i.Codec, "mjpeg", StringComparison.OrdinalIgnoreCase)).ToList();
+            }
+
+            if (returnFirstIfNoIndex && type == MediaStreamType.Audio)
+            {
+                return streams.FirstOrDefault(i => i.Channels.HasValue && i.Channels.Value > 0) ??
+                       streams.FirstOrDefault();
+            }
+
+            // Just return the first one
+            return returnFirstIfNoIndex ? streams.FirstOrDefault() : null;
+        }
+
+        /// <summary>
+        /// Gets the internal graphical subtitle param.
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <param name="outputVideoCodec">The output video codec.</param>
+        /// <returns>System.String.</returns>
+        public string GetGraphicalSubtitleParam(EncodingJobInfo state, string outputVideoCodec)
+        {
+            var outputSizeParam = string.Empty;
+
+            var request = state.BaseRequest;
+
+            // Add resolution params, if specified
+            if (request.Width.HasValue || request.Height.HasValue || request.MaxHeight.HasValue || request.MaxWidth.HasValue)
+            {
+                outputSizeParam = GetOutputSizeParam(state, outputVideoCodec).TrimEnd('"');
+
+                if (string.Equals(outputVideoCodec, "h264_vaapi", StringComparison.OrdinalIgnoreCase))
+                {
+                    outputSizeParam = "," + outputSizeParam.Substring(outputSizeParam.IndexOf("format", StringComparison.OrdinalIgnoreCase));
+                }
+                else
+                {
+                    outputSizeParam = "," + outputSizeParam.Substring(outputSizeParam.IndexOf("scale", StringComparison.OrdinalIgnoreCase));
+                }
+            }
+
+            if (string.Equals(outputVideoCodec, "h264_vaapi", StringComparison.OrdinalIgnoreCase) && outputSizeParam.Length == 0)
+            {
+                outputSizeParam = ",format=nv12|vaapi,hwupload";
+            }
+
+            var videoSizeParam = string.Empty;
+            
+            if (state.VideoStream != null && state.VideoStream.Width.HasValue && state.VideoStream.Height.HasValue)
+            {
+                videoSizeParam = string.Format("scale={0}:{1}", state.VideoStream.Width.Value.ToString(_usCulture), state.VideoStream.Height.Value.ToString(_usCulture));
+            }
+
+            var mapPrefix = state.SubtitleStream.IsExternal ?
+                1 :
+                0;
+
+            var subtitleStreamIndex = state.SubtitleStream.IsExternal
+                ? 0
+                : state.SubtitleStream.Index;
+
+            return string.Format(" -filter_complex \"[{0}:{1}]{4}[sub] ; [0:{2}] [sub] overlay{3}\"",
+                mapPrefix.ToString(_usCulture),
+                subtitleStreamIndex.ToString(_usCulture),
+                state.VideoStream.Index.ToString(_usCulture),
+                outputSizeParam,
+                videoSizeParam);
+        }
+
+        /// <summary>
+        /// If we're going to put a fixed size on the command line, this will calculate it
+        /// </summary>
+        /// <param name="state">The state.</param>
+        /// <param name="outputVideoCodec">The output video codec.</param>
+        /// <param name="allowTimeStampCopy">if set to <c>true</c> [allow time stamp copy].</param>
+        /// <returns>System.String.</returns>
+        public string GetOutputSizeParam(EncodingJobInfo state,
+            string outputVideoCodec,
+            bool allowTimeStampCopy = true)
+        {
+            // http://sonnati.wordpress.com/2012/10/19/ffmpeg-the-swiss-army-knife-of-internet-streaming-part-vi/
+
+            var request = state.BaseRequest;
+
+            var filters = new List<string>();
+
+            if (string.Equals(outputVideoCodec, "h264_vaapi", StringComparison.OrdinalIgnoreCase))
+            {
+                filters.Add("format=nv12|vaapi");
+                filters.Add("hwupload");
+            }
+            else if (state.DeInterlace && !string.Equals(outputVideoCodec, "h264_vaapi", StringComparison.OrdinalIgnoreCase))
+            {
+                filters.Add("yadif=0:-1:0");
+            }
+
+            if (string.Equals(outputVideoCodec, "h264_vaapi", StringComparison.OrdinalIgnoreCase))
+            {
+                // Work around vaapi's reduced scaling features
+                var scaler = "scale_vaapi";
+
+                // Given the input dimensions (inputWidth, inputHeight), determine the output dimensions
+                // (outputWidth, outputHeight). The user may request precise output dimensions or maximum
+                // output dimensions. Output dimensions are guaranteed to be even.
+                decimal inputWidth = Convert.ToDecimal(state.VideoStream.Width);
+                decimal inputHeight = Convert.ToDecimal(state.VideoStream.Height);
+                decimal outputWidth = request.Width.HasValue ? Convert.ToDecimal(request.Width.Value) : inputWidth;
+                decimal outputHeight = request.Height.HasValue ? Convert.ToDecimal(request.Height.Value) : inputHeight;
+                decimal maximumWidth = request.MaxWidth.HasValue ? Convert.ToDecimal(request.MaxWidth.Value) : outputWidth;
+                decimal maximumHeight = request.MaxHeight.HasValue ? Convert.ToDecimal(request.MaxHeight.Value) : outputHeight;
+
+                if (outputWidth > maximumWidth || outputHeight > maximumHeight)
+                {
+                    var scale = Math.Min(maximumWidth / outputWidth, maximumHeight / outputHeight);
+                    outputWidth = Math.Min(maximumWidth, Math.Truncate(outputWidth * scale));
+                    outputHeight = Math.Min(maximumHeight, Math.Truncate(outputHeight * scale));
+                }
+
+                outputWidth = 2 * Math.Truncate(outputWidth / 2);
+                outputHeight = 2 * Math.Truncate(outputHeight / 2);
+
+                if (outputWidth != inputWidth || outputHeight != inputHeight)
+                {
+                    filters.Add(string.Format("{0}=w={1}:h={2}", scaler, outputWidth.ToString(_usCulture), outputHeight.ToString(_usCulture)));
+                }
+            }
+            else
+            {
+                // If fixed dimensions were supplied
+                if (request.Width.HasValue && request.Height.HasValue)
+                {
+                    var widthParam = request.Width.Value.ToString(_usCulture);
+                    var heightParam = request.Height.Value.ToString(_usCulture);
+
+                    filters.Add(string.Format("scale=trunc({0}/2)*2:trunc({1}/2)*2", widthParam, heightParam));
+                }
+
+                // If Max dimensions were supplied, for width selects lowest even number between input width and width req size and selects lowest even number from in width*display aspect and requested size
+                else if (request.MaxWidth.HasValue && request.MaxHeight.HasValue)
+                {
+                    var maxWidthParam = request.MaxWidth.Value.ToString(_usCulture);
+                    var maxHeightParam = request.MaxHeight.Value.ToString(_usCulture);
+
+                    filters.Add(string.Format("scale=trunc(min(max(iw\\,ih*dar)\\,min({0}\\,{1}*dar))/2)*2:trunc(min(max(iw/dar\\,ih)\\,min({0}/dar\\,{1}))/2)*2", maxWidthParam, maxHeightParam));
+                }
+
+                // If a fixed width was requested
+                else if (request.Width.HasValue)
+                {
+                    var widthParam = request.Width.Value.ToString(_usCulture);
+
+                    filters.Add(string.Format("scale={0}:trunc(ow/a/2)*2", widthParam));
+                }
+
+                // If a fixed height was requested
+                else if (request.Height.HasValue)
+                {
+                    var heightParam = request.Height.Value.ToString(_usCulture);
+
+                    filters.Add(string.Format("scale=trunc(oh*a/2)*2:{0}", heightParam));
+                }
+
+                // If a max width was requested
+                else if (request.MaxWidth.HasValue)
+                {
+                    var maxWidthParam = request.MaxWidth.Value.ToString(_usCulture);
+
+                    filters.Add(string.Format("scale=trunc(min(max(iw\\,ih*dar)\\,{0})/2)*2:trunc(ow/dar/2)*2", maxWidthParam));
+                }
+
+                // If a max height was requested
+                else if (request.MaxHeight.HasValue)
+                {
+                    var maxHeightParam = request.MaxHeight.Value.ToString(_usCulture);
+
+                    filters.Add(string.Format("scale=trunc(oh*a/2)*2:min(max(iw/dar\\,ih)\\,{0})", maxHeightParam));
+                }
+            }
+
+            var output = string.Empty;
+
+            if (state.SubtitleStream != null && state.SubtitleStream.IsTextSubtitleStream && request.SubtitleMethod == SubtitleDeliveryMethod.Encode)
+            {
+                var subParam = GetTextSubtitleParam(state);
+
+                filters.Add(subParam);
+
+                if (allowTimeStampCopy)
+                {
+                    output += " -copyts";
+                }
+            }
+
+            if (filters.Count > 0)
+            {
+                output += string.Format(" -vf \"{0}\"", string.Join(",", filters.ToArray()));
+            }
+
+            return output;
+        }
+
+
+        /// <summary>
+        /// Gets the number of threads.
+        /// </summary>
+        /// <returns>System.Int32.</returns>
+        public int GetNumberOfThreads(EncodingJobInfo state, EncodingOptions encodingOptions, bool isWebm)
+        {
+            var threads = GetNumberOfThreadsInternal(state, encodingOptions, isWebm);
+
+            if (state.BaseRequest.CpuCoreLimit.HasValue && state.BaseRequest.CpuCoreLimit.Value > 0)
+            {
+                threads = Math.Min(threads, state.BaseRequest.CpuCoreLimit.Value);
+            }
+
+            return threads;
+        }
+
+        public void TryStreamCopy(EncodingJobInfo state)
+        {
+            if (state.VideoStream != null && CanStreamCopyVideo(state, state.VideoStream))
+            {
+                state.OutputVideoCodec = "copy";
+            }
+            else
+            {
+                var user = state.User;
+
+                // If the user doesn't have access to transcoding, then force stream copy, regardless of whether it will be compatible or not
+                if (user != null && !user.Policy.EnableVideoPlaybackTranscoding)
+                {
+                    state.OutputVideoCodec = "copy";
+                }
+            }
+
+            if (state.AudioStream != null && CanStreamCopyAudio(state, state.AudioStream, state.SupportedAudioCodecs))
+            {
+                state.OutputAudioCodec = "copy";
+            }
+            else
+            {
+                var user = state.User;
+
+                // If the user doesn't have access to transcoding, then force stream copy, regardless of whether it will be compatible or not
+                if (user != null && !user.Policy.EnableAudioPlaybackTranscoding)
+                {
+                    state.OutputAudioCodec = "copy";
+                }
+            }
+        }
+
+        public string GetInputModifier(EncodingJobInfo state, EncodingOptions encodingOptions)
+        {
+            var inputModifier = string.Empty;
+
+            var probeSize = GetProbeSizeArgument(state);
+            inputModifier += " " + probeSize;
+            inputModifier = inputModifier.Trim();
+
+            var userAgentParam = GetUserAgentParam(state);
+
+            if (!string.IsNullOrWhiteSpace(userAgentParam))
+            {
+                inputModifier += " " + userAgentParam;
+            }
+
+            inputModifier = inputModifier.Trim();
+
+            inputModifier += " " + GetFastSeekCommandLineParameter(state.BaseRequest);
+            inputModifier = inputModifier.Trim();
+
+            //inputModifier += " -fflags +genpts+ignidx+igndts";
+            //if (state.IsVideoRequest && genPts)
+            //{
+            //    inputModifier += " -fflags +genpts";
+            //}
+
+            if (!string.IsNullOrEmpty(state.InputAudioSync))
+            {
+                inputModifier += " -async " + state.InputAudioSync;
+            }
+
+            if (!string.IsNullOrEmpty(state.InputVideoSync))
+            {
+                inputModifier += " -vsync " + state.InputVideoSync;
+            }
+
+            if (state.ReadInputAtNativeFramerate)
+            {
+                inputModifier += " -re";
+            }
+
+            var videoDecoder = GetVideoDecoder(state, encodingOptions);
+            if (!string.IsNullOrWhiteSpace(videoDecoder))
+            {
+                inputModifier += " " + videoDecoder;
+            }
+
+            if (state.IsVideoRequest)
+            {
+                // Important: If this is ever re-enabled, make sure not to use it with wtv because it breaks seeking
+                if (string.Equals(state.OutputContainer, "mkv", StringComparison.OrdinalIgnoreCase) && state.CopyTimestamps)
+                {
+                    //inputModifier += " -noaccurate_seek";
+                }
+
+                if (!string.IsNullOrWhiteSpace(state.InputContainer))
+                {
+                    var inputFormat = GetInputFormat(state.InputContainer);
+                    if (!string.IsNullOrWhiteSpace(inputFormat))
+                    {
+                        inputModifier += " -f " + inputFormat;
+                    }
+                }
+
+                if (state.RunTimeTicks.HasValue)
+                {
+                    foreach (var stream in state.MediaSource.MediaStreams)
+                    {
+                        if (!stream.IsExternal && stream.Type != MediaStreamType.Subtitle)
+                        {
+                            if (!string.IsNullOrWhiteSpace(stream.Codec) && stream.Index != -1)
+                            {
+                                var decoder = GetDecoderFromCodec(stream.Codec);
+
+                                if (!string.IsNullOrWhiteSpace(decoder))
+                                {
+                                    inputModifier += " -codec:" + stream.Index.ToString(_usCulture) + " " + decoder;
+                                }
+                            }
+                        }
+                    }
+                }
+            }
+
+            return inputModifier;
+        }
+
+
+        public void AttachMediaSourceInfo(EncodingJobInfo state,
+          MediaSourceInfo mediaSource,
+          string requestedUrl)
+        {
+            state.MediaPath = mediaSource.Path;
+            state.InputProtocol = mediaSource.Protocol;
+            state.InputContainer = mediaSource.Container;
+            state.RunTimeTicks = mediaSource.RunTimeTicks;
+            state.RemoteHttpHeaders = mediaSource.RequiredHttpHeaders;
+
+            if (mediaSource.VideoType.HasValue)
+            {
+                state.VideoType = mediaSource.VideoType.Value;
+            }
+
+            state.IsoType = mediaSource.IsoType;
+
+            state.PlayableStreamFileNames = mediaSource.PlayableStreamFileNames.ToList();
+
+            if (mediaSource.Timestamp.HasValue)
+            {
+                state.InputTimestamp = mediaSource.Timestamp.Value;
+            }
+
+            state.InputProtocol = mediaSource.Protocol;
+            state.MediaPath = mediaSource.Path;
+            state.RunTimeTicks = mediaSource.RunTimeTicks;
+            state.RemoteHttpHeaders = mediaSource.RequiredHttpHeaders;
+            state.ReadInputAtNativeFramerate = mediaSource.ReadAtNativeFramerate;
+
+            if (state.ReadInputAtNativeFramerate ||
+                mediaSource.Protocol == MediaProtocol.File && string.Equals(mediaSource.Container, "wtv", StringComparison.OrdinalIgnoreCase))
+            {
+                state.OutputAudioSync = "1000";
+                state.InputVideoSync = "-1";
+                state.InputAudioSync = "1";
+            }
+
+            if (string.Equals(mediaSource.Container, "wma", StringComparison.OrdinalIgnoreCase))
+            {
+                // Seeing some stuttering when transcoding wma to audio-only HLS
+                state.InputAudioSync = "1";
+            }
+
+            var mediaStreams = mediaSource.MediaStreams;
+
+            if (state.IsVideoRequest)
+            {
+                var videoRequest = state.BaseRequest;
+
+                if (string.IsNullOrEmpty(videoRequest.VideoCodec))
+                {
+                    if (string.IsNullOrWhiteSpace(requestedUrl))
+                    {
+                        requestedUrl = "test." + videoRequest.OutputContainer;
+                    }
+
+                    videoRequest.VideoCodec = InferVideoCodec(requestedUrl);
+                }
+
+                state.VideoStream = GetMediaStream(mediaStreams, videoRequest.VideoStreamIndex, MediaStreamType.Video);
+                state.SubtitleStream = GetMediaStream(mediaStreams, videoRequest.SubtitleStreamIndex, MediaStreamType.Subtitle, false);
+                state.SubtitleDeliveryMethod = videoRequest.SubtitleMethod;
+                state.AudioStream = GetMediaStream(mediaStreams, videoRequest.AudioStreamIndex, MediaStreamType.Audio);
+
+                if (state.SubtitleStream != null && !state.SubtitleStream.IsExternal)
+                {
+                    state.InternalSubtitleStreamOffset = mediaStreams.Where(i => i.Type == MediaStreamType.Subtitle && !i.IsExternal).ToList().IndexOf(state.SubtitleStream);
+                }
+
+                if (state.VideoStream != null && state.VideoStream.IsInterlaced)
+                {
+                    state.DeInterlace = true;
+                }
+
+                EnforceResolutionLimit(state);
+            }
+            else
+            {
+                state.AudioStream = GetMediaStream(mediaStreams, null, MediaStreamType.Audio, true);
+            }
+
+            state.MediaSource = mediaSource;
+        }
+
+        /// <summary>
+        /// Gets the name of the output video codec
+        /// </summary>
+        protected string GetVideoDecoder(EncodingJobInfo state, EncodingOptions encodingOptions)
+        {
+            if (string.Equals(state.OutputVideoCodec, "copy", StringComparison.OrdinalIgnoreCase))
+            {
+                return null;
+            }
+
+            // Only use alternative encoders for video files.
+            // When using concat with folder rips, if the mfx session fails to initialize, ffmpeg will be stuck retrying and will not exit gracefully
+            // Since transcoding of folder rips is expiremental anyway, it's not worth adding additional variables such as this.
+            if (state.VideoType != VideoType.VideoFile)
+            {
+                return null;
+            }
+
+            if (state.VideoStream != null && !string.IsNullOrWhiteSpace(state.VideoStream.Codec))
+            {
+                if (string.Equals(encodingOptions.HardwareAccelerationType, "qsv", StringComparison.OrdinalIgnoreCase))
+                {
+                    switch (state.MediaSource.VideoStream.Codec.ToLower())
+                    {
+                        case "avc":
+                        case "h264":
+                            if (_mediaEncoder.SupportsDecoder("h264_qsv"))
+                            {
+                                return "-c:v h264_qsv ";
+                            }
+                            break;
+                        case "mpeg2video":
+                            if (_mediaEncoder.SupportsDecoder("mpeg2_qsv"))
+                            {
+                                return "-c:v mpeg2_qsv ";
+                            }
+                            break;
+                        case "vc1":
+                            if (_mediaEncoder.SupportsDecoder("vc1_qsv"))
+                            {
+                                return "-c:v vc1_qsv ";
+                            }
+                            break;
+                    }
+                }
+            }
+
+            // leave blank so ffmpeg will decide
+            return null;
+        }
+
+        /// <summary>
+        /// Gets the number of threads.
+        /// </summary>
+        /// <returns>System.Int32.</returns>
+        private int GetNumberOfThreadsInternal(EncodingJobInfo state, EncodingOptions encodingOptions, bool isWebm)
+        {
+            var threads = encodingOptions.EncodingThreadCount;
+
+            if (isWebm)
+            {
+                // Recommended per docs
+                return Math.Max(Environment.ProcessorCount - 1, 2);
+            }
+
+            // Automatic
+            if (threads == -1)
+            {
+                return 0;
+            }
+
+            return threads;
+        }
+    }
+}