Howto change fourcc in mp4 file?

[david_tm]

Hello. I need to change fourcc codes (subcodes) in some file.
MP4Box reports on -info following:
Track # 1 Info - TrackID 1 - TimeScale 22050 - Duration 00:11:20.669
Media Info: Language "Undetermined" - Type "soun:mp4a" - 14657 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 22050
Self-synchronized

Track # 2 Info - TrackID 2 - TimeScale 1000 - Duration 00:11:20.668
Media Info: Language "Undetermined" - Type "text:tx3g" - 2 samples
3GPP/MPEG-4 Timed Text - Size 0 x 0 - Translation X=0 Y=0 - Layer 0


I want it to be like this:
Track # 1 Info - TrackID 1 - TimeScale 22050 - Duration 00:11:20.669
Media Info: Language "Unknown" - Type "soun:mp4a" - 14657 samples
MPEG-4 Config: Audio Stream - ObjectTypeIndication 0x40
MPEG-4 Audio AAC LC - 2 Channel(s) - SampleRate 22050
Self-synchronized

Track # 2 Info - TrackID 2 - TimeScale 600 - Duration 00:11:20.668
Media Info: Language "Undetermined" - Type "text:text" - 2 samples
3GPP/MPEG-4 Timed Text - Size 0 x 0 - Translation X=0 Y=0 - Layer 0

How this can be achieved?