[M4IF Technotes] Repeated VOSH/VO/VOL headers and mp4 files?

[Chandra Sekhar Reddy G]

Hi,
Happy New Year
In the MP4-file,
You can place multiple "MP4VisualSampleEntryBox" for a track,
at the required places (required whenever the config-info changes, optional
if config-info does not change).
In your case, for every INTA-VOP.
For every TRACK, there is one "SampleDescriptionBox".
for every "SampleDescription" Box, there can be multiple (minimum one)
"MP4VisualSampleEntryBox".
Thereafter, the hierarchy is
MP4VisualSampleEntryBox :: ESDBox :: ES_Descriptor ::
DecoderConfigDescriptor :: DecoderSpecificInfo.
DecoderSpecificInfo contains the config-info (vosh+vo+vol headers for
mpeg4-video).
Hope this answers.
Regards,
Chandra
----- Original Message -----
From: "Char Acter" <charact3r   yahoo.com>
To: <technotes   lists.m4if.org>
Sent: Saturday, January 04, 2024 7:59 PM
Subject: [M4IF Technotes] Repeated VOSH/VO/VOL headers and mp4 files?
> Can anyone tell me how a video track in a mp4 file
> should be formed if:
>
> * I have VOSH/VO/VOL headers preceding every I-VOP
> (DivX-style)
> * My VOL headers contain VBV information (and thus are
> different through the stream)
>
> How can can I preserve the repeated headers
> efficiently and legally in a mp4 file?
>
> Happy New Year!
>
> Char
>
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