[Mp4-tech] Close Caption in MPEG4-AVC

[Sassan Pejhan]

Ilan,
To pick up where Gary left off, one standard body which has defined a 
mechanism for transport and storage of Closed Caption data in an MPEG-4
setting is the Internet Streaming Media Alliance (ISMA). They have defined 
a spec which carries the CC data as a separate stream altogether (rather 
than embedded as User data in the video frames - which was the case with 
ATSC and MPEG-2). 
ISMA specs are freely available from www.isma.tv
Regards,
Sassan
-----Original Message-----
From: Gary Sullivan [mailto:garysull windows.microsoft.com]
Sent: Sunday, January 29, 2024 2:01 PM
To: Ilan Daniel; mp4-tech lists.mpegif.org
Cc: David Ben Atar
Subject: RE: [Mp4-tech] Close Caption in MPEG4-AVC
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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