diff options
| -rw-r--r-- | MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs | 22 |
1 files changed, 16 insertions, 6 deletions
diff --git a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs index 9a759ba41..39c0bfed4 100644 --- a/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs +++ b/MediaBrowser.MediaEncoding/Encoder/MediaEncoder.cs @@ -720,13 +720,11 @@ namespace MediaBrowser.MediaEncoding.Encoder filters.Add(scaler); - // Use ffmpeg to sample 100 (we can drop this if required using thumbnail=50 for 50 frames) frames and pick the best thumbnail. Have a fall back just in case. - // mpegts need larger batch size otherwise the corrupted thumbnail will be created. Larger batch size will lower the processing speed. + // Use ffmpeg to sample N frames and pick the best thumbnail. Have a fall back just in case. var enableThumbnail = !useTradeoff && useIFrame && !string.Equals("wtv", container, StringComparison.OrdinalIgnoreCase); if (enableThumbnail) { - var useLargerBatchSize = string.Equals("mpegts", container, StringComparison.OrdinalIgnoreCase); - filters.Add("thumbnail=n=" + (useLargerBatchSize ? "50" : "24")); + filters.Add("thumbnail=n=24"); } // Use SW tonemap on HDR video stream only when the zscale or tonemapx filter is available. @@ -750,14 +748,26 @@ namespace MediaBrowser.MediaEncoding.Encoder var vf = string.Join(',', filters); var mapArg = imageStreamIndex.HasValue ? (" -map 0:" + imageStreamIndex.Value.ToString(CultureInfo.InvariantCulture)) : string.Empty; - var args = string.Format(CultureInfo.InvariantCulture, "-i {0}{3} -threads {4} -v quiet -vframes 1 -vf {2}{5} -f image2 \"{1}\"", inputPath, tempExtractPath, vf, mapArg, _threads, isAudio ? string.Empty : GetImageResolutionParameter()); + var args = string.Format( + CultureInfo.InvariantCulture, + "-i {0}{1} -threads {2} -v quiet -vframes 1 -vf {3}{4}{5} -f image2 \"{6}\"", + inputPath, + mapArg, + _threads, + vf, + isAudio ? string.Empty : GetImageResolutionParameter(), + EncodingHelper.GetVideoSyncOption("0", EncoderVersion).Trim(), // passthrough timestamp + tempExtractPath); if (offset.HasValue) { args = string.Format(CultureInfo.InvariantCulture, "-ss {0} ", GetTimeParameter(offset.Value)) + args; } - if (useIFrame && useTradeoff) + // The mpegts demuxer cannot seek to keyframes, so we have to let the + // decoder discard non-keyframes, which may contain corrupted images. + var seekMpegTs = offset.HasValue && string.Equals("mpegts", container, StringComparison.OrdinalIgnoreCase); + if ((useIFrame && useTradeoff) || seekMpegTs) { args = "-skip_frame nokey " + args; } |