When I try to use either of the two commands below using "-map 0" just like I did when I remuxed the original MKV into an MP4, the commands fail and both result in the following output.įfmpeg.exe -i input.mp4 -map 0 -c copy -c:s srt output.mkvįfmpeg.exe -i input.mp4 -map 0 -c:v copy -c:a copy -c:s srt output.mkv These two commands work, however, the output MKV only contains ONE of the TWO audio streams.įfmpeg.exe -i input.mp4 -c copy -c:s srt output.mkvįfmpeg.exe -i input.mp4 -c:v copy -c:a copy -c:s srt output.mkv However, if I omit "-map 0" from the command, it works but only ONE of the audio streams get copied to the output MKV file. The resulting output MP4 contains all the streams from the original MKV.īut if I try to remux the output MP4 into an MKV using the same command, but with a different codec for the subtitles and different file extension, I get an error. I was able to remux the MKV into an MP4 using this command.įfmpeg.exe -i input.mp4 -c copy -c:s mov_text output.mkv I have an MKV file that contains 5 streams. MacOS/Linux: for f in *.mkv do ffmpeg -i "$f" -c copy "$ \
All MKV files found in the directory will be converted with their original filename. This can be run directly from command line.
If you want to batch convert multiple MKV files, you can switch into the directory that contains MKV files and run the following, depending on OS. Single file conversion example ffmpeg -i example.mkv -c copy example.mp4 If not just substitute with the full path to your ffmpeg binary. These examples assume ffmpeg is in your PATH. Older examples may use -vcodec copy -acodec copy which does the same thing.
With ffmpeg this can be achieved with -c copy. The main factor is disk read/write speed. This avoids any encoding task and hence no quality will be lost, it is also a fairly quick process and requires very little CPU power. The easiest way to "convert" MKV to MP4, is to copy the existing video and audio streams and place them into a new container.
Converting mkv to mp4 with ffmpeg Essentially just copy the existing video and audio stream as is into a new container, no funny business!
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