[M4IF Technotes] Media Data Query
Magnus Hoem
magnus.hoem popwire.com
Wed Mar 5 10:59:06 EST 2003
Hi!
It doesn't matter how many mdat-atoms there are. Which data to get is
defined in the stco-atom (together with stsz-atom). Often neither the
audio not the video data comes first, it is usually muxed to prevent
the parser of the file from having to do a lot of skipping back and
forth in the file.
Best regards,
Magnus
On Wednesday, March 5, 2003, at 10:35 AM, bharat nihalani wrote:
> Dear All !
>
> As per the standard, there could be more than one 'mdat' atoms in the
> MP4 file. Is there any info in MP4 file that says which 'mdat' atom
> corresponds to which track.
>
> 1) Suppose there are 2 tracks (Audio and Video) and 2 'mdat'
> atoms that contain data for Audio and Video tracks in the MP4 file;
> now how do I know which 'mdat' atom corresponds to a particular track?
>
> 2) There could even be just one 'mdat' atom that may contain data for
> both the tracks in the MP4 file. In this case either the Auidio data
> precedes the Video data or vice versa. Here, how do I get this
> information?
>
> Please try to help on this matter.
>
> Thanx in advance.
>
> Regards,
>
> Bharat
>
>
>
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>
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