How do I convert/re-encode this huge mp4-file to mkv (h264)?

[Packan]

Hi guys!
This is really embarrassing for me, but my memory or whatever have totally signed out when it came to this.

What I want to do is to convert mp4 to mkv, keep the video as it is and prepare for some subtitles.

I think i've used programs to mux/demux the files to split the audio/video. Then I think we used Avisynth or something and mkvmerge.
I have forgot almost everything and I Really need this mp4 to be mkv with my subs added aswell asap.

If some of you guys know how to rips in the best way this days, with the right "scene-standards" and all, feel free to en-light me!

Please, help a fellow Swede in small panic.
Best Regards
Marcus

Here is some data from the mp4.

[manono]

You could demux with MP4Box together with a GUI, and then make an MKV of the video, audio and subs with MKVMerge/MKVToolNix.

[Packan]

You could demux with MP4Box together with a GUI, and then make an MKV of the video, audio and subs with MKVMerge/MKVToolNix.

Thanks for the ideas. Gonna try it.

[videobruger]

No need to de-mux. Just use MKVMergeGUI and add your MP4 and subtitles.

[manono]

Oh yeah, you're right. I never used it for that. Thanks for pointing out the quicker and easier way.