[M4IF Technotes] elementary stream location in mp4 file

[T Sundar Murthy]

Hi,
You can find the elementary stream  samples info in the following locations (In case of self-contained MP4 file)
Locate sample table atom (stbl) for the track. This contains the details of the elementary stream arrangement in the mp4 file.
Inside 'stbl', you can find the following atoms:
-- 'stts' - maps the time to sample(frame)-numbers
-- 'stsz' - gives size or each sample
-- 'stsc' - maps samples to chunks (which sample falls in which chunk)
-- 'stco' - gives the chunk offset
The Config-Info (VOL headers) can be found in the sample description ('stsd') atom in 'stbl'.
Refer to ISO/IEC 14496-1:2001(E) - Annex R (Informative) - Random Access.
or
Refer to "ISO Base Media File Format" - Annex A-3 & A-7.
Regards
Sundar
Ariel David wrote:
> Hi,
>
> I am trying to decode mp4 files that have simple profile video in them.
> In other words, I am trying to extract simple profile video from mp4 files.
>
> I've gone through the system standard and managed to read and decode the different atoms.
>
> I can't seem to find anywhere an atom that tells me the elementary stream location in the MDAT atom.
> At first I thought it would be in the DREF (url or urn) atom, but I could not find it there.
> Which atom holds this information if at all?
>
> Can someone point me to mp4 files with simple profile video in them?  I have the 4 different "lastword" mp4 files and that's it.
>
> Thanks,
>
> Ariel
>
> _______________________________________________
> Technotes mailing list
> Technotes   lists.m4if.org
> http://lists.m4if.org/mailman/listinfo/technotes
>
> **************************************************************
> Scanned by  MailScan Anti-Virus and Content Security Software.
> Visit http://www.mwti.net for more info on eScan and MailScan.
> **************************************************************

--