I had a mp4 file with one audio track and an additional audio track.
I did MP4Box -add addtional.mp3 movie.mp4
The result is a file which Quicktime refuses to play and iTunes doesn't even imort it.
The error message (humbly translated by my from German to english) "The movie contains an invalid sample description".
I tried MP4Box -ipod movie.mp4
but the resulting file is still unusable.
I'm using
MP4Box - GPAC version 0.4.6-DEV-rev3812
GPAC Copyright: (c) Jean Le Feuvre 2000-2005
(c) ENST 2005-200X
GPAC Configuration: --extra-cflags='-arch i386 -isysroot /Developer/SDKs/MacOSX10.5.sdk' --extra-ldflags='-mmacosx-version-min=10.4 -arch i386 -isysroot /Developer/SDKs/MacOSX10.5.sdk'
Features: GPAC_HAS_SSL GPAC_HAS_SPIDERMONKEY GPAC_HAS_JPEG GPAC_HAS_PNG
as I just have a MacBook with 10.5.8
Copy & paste of part of the output:
ISO File Writing: |=================== |No such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such fiNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such file or directoryNo such fiNo such file or directory
iTunes / QuckTime doesn't support MP3 in MP4 - at least not with the standard storage way. Try reencoding in aac your additional audio file and import again
I've fixed the "No such file or directory" thing with https://sourceforge.net/apps/trac/gpac/changeset/3817/
Romain