diff options
Diffstat (limited to 'MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs')
| -rw-r--r-- | MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs | 110 |
1 files changed, 70 insertions, 40 deletions
diff --git a/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs b/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs index f5f753684..9ecb5fe8c 100644 --- a/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs +++ b/MediaBrowser.Api/Playback/Hls/DynamicHlsService.cs @@ -192,6 +192,7 @@ namespace MediaBrowser.Api.Playback.Hls if (File.Exists(segmentPath)) { job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType); + Logger.LogDebug("returning {0} [it exists, try 1]", segmentPath); return await GetSegmentResult(state, playlistPath, segmentPath, segmentExtension, requestedIndex, job, cancellationToken).ConfigureAwait(false); } @@ -207,6 +208,7 @@ namespace MediaBrowser.Api.Playback.Hls job = ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType); transcodingLock.Release(); released = true; + Logger.LogDebug("returning {0} [it exists, try 2]", segmentPath); return await GetSegmentResult(state, playlistPath, segmentPath, segmentExtension, requestedIndex, job, cancellationToken).ConfigureAwait(false); } else @@ -243,6 +245,7 @@ namespace MediaBrowser.Api.Playback.Hls request.StartTimeTicks = GetStartPositionTicks(state, requestedIndex); + state.WaitForPath = segmentPath; job = await StartFfMpeg(state, playlistPath, cancellationTokenSource).ConfigureAwait(false); } catch @@ -277,7 +280,7 @@ namespace MediaBrowser.Api.Playback.Hls // await Task.Delay(50, cancellationToken).ConfigureAwait(false); //} - Logger.LogInformation("returning {0}", segmentPath); + Logger.LogDebug("returning {0} [general case]", segmentPath); job = job ?? ApiEntryPoint.Instance.OnTranscodeBeginRequest(playlistPath, TranscodingJobType); return await GetSegmentResult(state, playlistPath, segmentPath, segmentExtension, requestedIndex, job, cancellationToken).ConfigureAwait(false); } @@ -458,56 +461,68 @@ namespace MediaBrowser.Api.Playback.Hls TranscodingJob transcodingJob, CancellationToken cancellationToken) { - var segmentFileExists = File.Exists(segmentPath); - - // If all transcoding has completed, just return immediately - if (transcodingJob != null && transcodingJob.HasExited && segmentFileExists) + var segmentExists = File.Exists(segmentPath); + if (segmentExists) { - return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false); - } + if (transcodingJob != null && transcodingJob.HasExited) + { + // Transcoding job is over, so assume all existing files are ready + Logger.LogDebug("serving up {0} as transcode is over", segmentPath); + return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false); + } - if (segmentFileExists) - { var currentTranscodingIndex = GetCurrentTranscodingIndex(playlistPath, segmentExtension); // If requested segment is less than transcoding position, we can't transcode backwards, so assume it's ready if (segmentIndex < currentTranscodingIndex) { + Logger.LogDebug("serving up {0} as transcode index {1} is past requested point {2}", segmentPath, currentTranscodingIndex, segmentIndex); return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false); } } - var segmentFilename = Path.GetFileName(segmentPath); - - while (!cancellationToken.IsCancellationRequested) + var nextSegmentPath = GetSegmentPath(state, playlistPath, segmentIndex + 1); + if (transcodingJob != null) { - try + while (!cancellationToken.IsCancellationRequested && !transcodingJob.HasExited) { - var text = File.ReadAllText(playlistPath, Encoding.UTF8); - - // If it appears in the playlist, it's done - if (text.IndexOf(segmentFilename, StringComparison.OrdinalIgnoreCase) != -1) + // To be considered ready, the segment file has to exist AND + // either the transcoding job should be done or next segment should also exist + if (segmentExists) { - if (!segmentFileExists) + if (transcodingJob.HasExited || File.Exists(nextSegmentPath)) { - segmentFileExists = File.Exists(segmentPath); + Logger.LogDebug("serving up {0} as it deemed ready", segmentPath); + return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false); } - if (segmentFileExists) + } + else + { + segmentExists = File.Exists(segmentPath); + if (segmentExists) { - return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false); + continue; // avoid unnecessary waiting if segment just became available } - //break; } + + await Task.Delay(100, cancellationToken).ConfigureAwait(false); + } + + if (!File.Exists(segmentPath)) + { + Logger.LogWarning("cannot serve {0} as transcoding quit before we got there", segmentPath); } - catch (IOException) + else { - // May get an error if the file is locked + Logger.LogDebug("serving {0} as it's on disk and transcoding stopped", segmentPath); } - - await Task.Delay(100, cancellationToken).ConfigureAwait(false); + cancellationToken.ThrowIfCancellationRequested(); + } + else + { + Logger.LogWarning("cannot serve {0} as it doesn't exist and no transcode is running", segmentPath); } - cancellationToken.ThrowIfCancellationRequested(); return await GetSegmentResult(state, segmentPath, segmentIndex, transcodingJob).ConfigureAwait(false); } @@ -521,6 +536,7 @@ namespace MediaBrowser.Api.Playback.Hls FileShare = FileShareMode.ReadWrite, OnComplete = () => { + Logger.LogDebug("finished serving {0}", segmentPath); if (transcodingJob != null) { transcodingJob.DownloadPositionTicks = Math.Max(transcodingJob.DownloadPositionTicks ?? segmentEndingPositionTicks, segmentEndingPositionTicks); @@ -909,9 +925,23 @@ namespace MediaBrowser.Api.Playback.Hls else { var keyFrameArg = string.Format( + CultureInfo.InvariantCulture, " -force_key_frames:0 \"expr:gte(t,{0}+n_forced*{1})\"", GetStartNumber(state) * state.SegmentLength, - state.SegmentLength.ToString(CultureInfo.InvariantCulture)); + state.SegmentLength); + if (state.TargetFramerate.HasValue) + { + // This is to make sure keyframe interval is limited to our segment, + // as forcing keyframes is not enough. + // Example: we encoded half of desired length, then codec detected + // scene cut and inserted a keyframe; next forced keyframe would + // be created outside of segment, which breaks seeking. + keyFrameArg += string.Format( + CultureInfo.InvariantCulture, + " -g {0} -keyint_min {0}", + (int)(state.SegmentLength * state.TargetFramerate) + ); + } var hasGraphicalSubs = state.SubtitleStream != null && !state.SubtitleStream.IsTextSubtitleStream && state.SubtitleDeliveryMethod == SubtitleDeliveryMethod.Encode; @@ -955,6 +985,15 @@ namespace MediaBrowser.Api.Playback.Hls var threads = EncodingHelper.GetNumberOfThreads(state, encodingOptions, videoCodec); + if (state.BaseRequest.BreakOnNonKeyFrames) + { + // FIXME: this is actually a workaround, as ideally it really should be the client which decides whether non-keyframe + // breakpoints are supported; but current implementation always uses "ffmpeg input seeking" which is liable + // to produce a missing part of video stream before first keyframe is encountered, which may lead to + // awkward cases like a few starting HLS segments having no video whatsoever, which breaks hls.js + Logger.LogInformation("Current HLS implementation doesn't support non-keyframe breaks but one is requested, ignoring that request"); + state.BaseRequest.BreakOnNonKeyFrames = false; + } var inputModifier = EncodingHelper.GetInputModifier(state, encodingOptions); // If isEncoding is true we're actually starting ffmpeg @@ -965,14 +1004,6 @@ namespace MediaBrowser.Api.Playback.Hls var outputTsArg = Path.Combine(Path.GetDirectoryName(outputPath), Path.GetFileNameWithoutExtension(outputPath)) + "%d" + GetSegmentFileExtension(state.Request); - var timeDeltaParam = string.Empty; - - if (isEncoding && state.TargetFramerate > 0) - { - float startTime = 1 / (state.TargetFramerate.Value * 2); - timeDeltaParam = string.Format(CultureInfo.InvariantCulture, "-segment_time_delta {0:F3}", startTime); - } - var segmentFormat = GetSegmentFileExtension(state.Request).TrimStart('.'); if (string.Equals(segmentFormat, "ts", StringComparison.OrdinalIgnoreCase)) { @@ -980,7 +1011,7 @@ namespace MediaBrowser.Api.Playback.Hls } return string.Format( - "{0} {1} -map_metadata -1 -map_chapters -1 -threads {2} {3} {4} {5} -f segment -max_delay 5000000 -avoid_negative_ts disabled -start_at_zero -segment_time {6} {10} -individual_header_trailer 0 -segment_format {11} -segment_list_type m3u8 -segment_start_number {7} -segment_list \"{8}\" -y \"{9}\"", + "{0} {1} -map_metadata -1 -map_chapters -1 -threads {2} {3} {4} {5} -f hls -max_delay 5000000 -avoid_negative_ts disabled -start_at_zero -hls_time {6} -individual_header_trailer 0 -hls_segment_type {7} -start_number {8} -hls_segment_filename \"{9}\" -hls_playlist_type vod -hls_list_size 0 -y \"{10}\"", inputModifier, EncodingHelper.GetInputArgument(state, encodingOptions), threads, @@ -988,11 +1019,10 @@ namespace MediaBrowser.Api.Playback.Hls GetVideoArguments(state, encodingOptions), GetAudioArguments(state, encodingOptions), state.SegmentLength.ToString(CultureInfo.InvariantCulture), + segmentFormat, startNumberParam, - outputPath, outputTsArg, - timeDeltaParam, - segmentFormat + outputPath ).Trim(); } } |