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FixingShortVideoError.md

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Fixing Short Video Error

For the following video, https://www.youtube.com/watch?v=FztEmE7F68Q, youtube-dl does not create a final video file that plays correctly. This has to due with ffmpeg incorrectly muxing the audio and video streams that it gets from youtube. To work around this:

  1. Add -k to your youtube-dl command to keep the audio and video streams.
  2. Download avconv from https://libav.org/documentation
  3. Combine the video and audio streams into one file avconv.exe -i .\video.mp4 -i .\audio.m4a -acodec copy -vcodec copy merged.mp4
  4. Re-add the metadata from original file produced by youtube-dl/ffmpeg ffmpeg -i broken_original.mp4 -i merged.mp4 -map 1 -c copy -map_metadata 0 -map_metadata:s:v 0:s:v -map_metadata:s:a 0:s:a out.mp4
  5. Rename out.mp4 and delete the other .mp4 and .m4a files.