[Mp4-tech] MP4 file with more than one video tracks

[Cyril Concolato]

Hi,
If you're file is compliant to MPEG-4 Systems, it should contain a BIFS 
track which contains the composition instructions among which you will 
find: scene size (w,h) position and size of the video to be displayed 
and time at which they should be displayed.
If the file does not contain the BIFS track, then it is not a compliant 
MP4 file, and to my knowledge behavior is undefined (except maybe for 
Quicktime).
Best,
Cyril Concolato
¤_©ú®Û a écrit :
> Hi,
> 
> I'm developing a media player the supports mp4 file with MPEG4 simple
> profile 
> but I've gotten problem when rendering a mp4 file with 2 video tracks 
> and 1 audio track. 
> Is this a legal mp4 file ? If yes, which video track should I render ?
> I have consulted the MP4 system standard 14496-1 Ch.13 to
> find some information. But the spec does not mention this.
> 
> Can anyone tell me how to render this file ?
> 
> Thanks !
> 
> Henry
> 
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