Here are some commonly-used MP4Box commands.
Check MP4 File Content
MP4Box -info <filename>
Extract MP4 Track
MP4Box -raw <Track Number> <filename>
Track number can be seen using
Merge Raw Files into MP4
MP4Box -add '<Video Track>#video' -add '<Audio Track>#audio' [Output Filename]
#audio suffixes signify the tracks are video and audio,
respectively, and should be appended to the filenames. If additional tracks need
to be added, such as subtitle tracks, just append
-add '<filename>' to the
Note: All the tracks in the MP4, MKV, AVI or MPEG containers need to be extracted first before they can be put in a new MP4 container using MP4Box.