You can use it to quickly see what is in the MKV container. It does a bunch, but I primarily us it to remux MKV files or put MP4's in to an MKV with subtitles, chapters, etc. I know its old, but since no one said it I just have to leave a comment. mkv extension is removed from the final output to avoid the filename ending up as 4 which would be a bit weird, although harmless.Was looking for something else and saw this. If running within a batch script, you will need to double the percentage signs %% in order for the command to run properly. R is used to recursively search within sub directories at the target location. Windows one-liner example: for /R %f IN (*.mkv) DO ffmpeg -i '%f' -c copy '%~nf.mp4' MacOS/Linux: for f in *.mkv do ffmpeg -i '$f' -c copy '$.mp4' done 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!

Ffmpeg convert mkv to mp4 for ps4