[M4IF Technotes] osdm handler

[Harald Fuchs]

On Thursday 03 July 2023 04:01, Trevor NG wrote:
> Hi experts,
>
> Referring to 14496-12 FDIS, the syntax elements
> for "mdia.minf.stbl.stsd" with handler_type "vide"
> and "soun" are clearly defined. But I can't find
> any syntax elements for handler_type "osdm". Could
> anyone here give me some hints that I can follow
> to decode the "mdia.minf.stbl.stsd" atom.
>
> Thanks in advance,
> Trevor

Hello Trevor,
14496-12 is the "ISO Media Fileformat". This document describes the basic 
elements of the fileformat. The ISO fileformat is not used directly, only 
derived versions (MP4, Motion-JPEG2000, 3GPP) are used.
In case of MP4: the MPEG-4 specific additions to the ISO base fileformat are 
described in 14496-14. "osdm" (ObjectDescriptorStream) is an MPEG-4 element, 
so you have to look into 14496-14 for it.
Regards,
Harald
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