[Mp4-tech] Close Caption in MPEG4-AVC

[Gary Sullivan]

Ilan et al,
That would likely be defined by the standards body that designs the
system (e.g., in ATSC it could be put into the video elementary stream
using a "User data registered by ITU-T Recommendation T.35" SEI message,
or it could be specified as a separate bitstream with a distinct PID in
the MPEG-2 systems (ITU-T Rec. H.222.0 | ISO/IEC 13818-1) multiplex.  
There is nothing defined in the AVC/H.264 standard itself that mandates
any particular method to carry such data.  The same is true in the case
of MPEG-2 Video (ITU-T Rec. H.262 | ISO/IEC 13818-2) -- in that case it
is the ATSC spec, rather than the video or systems ISO/IEC/ITU-T specs
where the method of carrying the closed captioning data is prescribed.
Best Regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Ilan Daniel
	Sent: Sunday, January 29, 2024 8:16 AM
	To: mp4-tech lists.mpegif.org
	Cc: David Ben Atar
	Subject: [Mp4-tech] Close Caption in MPEG4-AVC
	Hello experts,
	I wonder if someone has the answer:
	In the old standard that is in use today (MPEG2) in USA, 
	ATSC defines how to put the close caption inside the MPEG2 ES
video picture header user data.
	is there a parallel way to put Close Caption inside MPEG4-AVC?
	thanks,
	Ilan Daniel
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