.MP4 and .MKV are just containers, they can hold multiple media streams. You can convert with no quantity loss using ffmpeg.

https://askubuntu.com/questions/50433/how-to-convert-mkv-file-into-mp4-file-losslessly

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but how many subtitles and dubs can I have in one single .mp4 ?

I didn't know if there are different limits in MKV and MP4 for number of streams. I've encountered both with multiple audio and sometimes video streams.

https://video.stackexchange.com/questions/15821/how-are-video-and-audio-streams-placed-in-container-files-and-what-interrelati

also I’m on windows πŸ’€πŸ˜…

FFmpeg runs on everything.

Sounds good, doesn’t look retard frenly but I’ll try it!

https://www.ffmpeg.org <- this correct

Yes.

Let an LLM help you with the commands πŸ‘

"Use this command to include all streams:

ffmpeg -i input.mkv -c copy -map 0 output.mp4

Explanation of the added parts:

* -map 0: This option tells ffmpeg to include all streams (video, audio, and subtitles) from the input file (indicated by '0') in the output.

Important Note about Subtitles:

* MP4 has limited support for subtitle formats compared to MKV.

* If your MKV has advanced subtitle formats (like PGS or ASS), they might not be displayed correctly in some MP4 players.

* You can convert subtitles to a more compatible format (like MOV_text) if needed, but that's a more complex command."