[M4IF Technotes] osdm handler

[Dave Singer]

Harald has it exactly (as always).  In part 14 (and the old chapter 
13) you will find:
"For visual streams, a VisualSampleEntry is used; for audio streams, 
an AudioSampleEntry. For all other MPEG-4 streams, a MpegSampleEntry 
is used.  Hint tracks use an entry format specific to their protocol, 
with an appropriate name."
At 10:53 +0200 7/3/03, Harald Fuchs wrote:
>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

-- 
David Singer
Apple Computer/QuickTime
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