4 ms·

What is the difference between these: ffmpeg -i in.mkv out.mp4 ffmpeg -i in.mkv -c:v copy -c:a copy out.mp4

• pvg 6y ago
  The first one might re-encode, the second one explicitly doesn't, the streams are just copied as is.
  • _Gyan_ 6y ago
    The first one will re-encode.
    • pvg 6y ago
      Right but it's conceivable the default behaviour might change, the explicit one is quite unlikely to.
      • _Gyan_ 6y ago
        It hasn't, since ffmpeg's inception. It's very unlikely - it would require that ffmpeg verify codec compatibility with the output muxer. Not all muxers have registered a codec tags list , so that can't happen.
• deleted 6y ago
  [deleted]