.mp4 and multiple audio and subtitles tracks

[kaz219]

I'd like to know if there is a way to put a label on a subtitle or an audio track. So that, in VLC, instead of "track 1", "track 2" and so on, I have an indication of the content of each track.

I'm not interested in embedded subtitles, since they are obviously not yet supported by VLC. I'm talking about subtitles which are in an external .srt file.

I know I open once an mp4 file with VLC, and in the video>subtitle track menu, there was written "track 1 [english]" instead of just "track 1". Of course I'm unable to find it again...

Does any body know how to "labelize" this audio and subtitles tracks?

[kaz219]

./MP4Box -add video.mp4#video -add video.mp4#trackID=2:lang=eng video-new.mp4

does the trick.
Don't forget to run ./MP4Box -info video.mp4 to know which track got which ID. The ID have NOTHING to do with the order of the tracks.
track # 3 can have ID 34, even if there is only 5 tracks altogether.

I'm still searching how to modify the language without having to reimport the tracks. If somebody has an idea...

[kaz219]

ok:

 ./MP4Box -info video.mp4

get the trackID of the track (audio, video or sub) you want to set/change the language.

./MP4Box -lang trackID=eng video.mp4

done.

It's faster than the other method, even if the whole file has to be rewritten also. I couldn't manage to find a way to change/set many tracks' languages at the same time...