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mkv might need to re-encode and it might failed to play in mplayer player, in that case either you want to re-encode that files without -c copy option OR play with better player such as mpv player. 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!