Mp4 Remux into different container

[therock003]

My Media player has some problems with mp4s for some reason. No matter how many mp4s ivve tried playback is stutter and jittery. Mkvs on the other hand ive played 20gb 4k atmos files, no problem.

So whats the best way to remux those mp4s into mkvs and retain all information, tracks, subs chapters, whatever is on the inital mp4 file?

[pandy]

Doubt if your issue is related to container but you can try use ffmpeg to remux mp4 into mkv - not sure if all datatypes supported by mp4 are also supported by mkv (matroska) container but you can try - this is fast operation - you only need to have sufficient storage space.

@ffmpeg.exe -y -hide_banner -v 32 -stats -i %file% -c copy -f matroska "%~n1_.mkv"

[therock003]

Doubt if your issue is related to container but you can try use ffmpeg to remux mp4 into mkv

Why do you think so?

Also how can i add external subtitles from .srt and have them included as the default subtitle in the container?

[therock003]

Anyway so I used mkvtoolnix to remux and the sub as internal stream and everything worked perfectly. I now have a non stuttering file with sub included. I just don't know why that mp4 thing happens but I'll just have to remux i guess