[Mp4-tech] Re: Packetization (mayank agarwal)

[Joshi]

Dear Mr. Googie and Mayank!!
I am able to locate the PSC Code in the H.263 Elementary Stream.  But
have some difficulty in locating GOB and MB Boundaries.  This I did by
refereeing to the ffmpeg source.  But I have a doubt. In the application
level, how do we provide the RTP Time Stamp for the next frames,
assuming the first frame RTP Time stamp is some random or starts from
'0'.
[Assume:-   1.  I Know the Temporal Reference bits.
2.      PTYPE.
3.       Number of bytes contained in that previous frame]
My BIGGEST QUESTION Is. Whether the RTP Time stamp increments remain
constant from one frame to next frame [Assuming there is no skip in the
frames.]
Calculation:
                   I am using 25 fps.  90kHz sampling frequency.  
                   So, 40 ms --> 1 frame
                         1ms --> 90, 000 samples
           ------------------------------------------
                       1 frame --> 90, 000 x 40 ms = 3, 600 samples
So whether the increment in the RTP Time stamps from frame to frame
always increments by 3, 600.  
OR
It varies according to the INTRA or INTER Frames.??
Pls Confirm.. Experts pls comment if it is correct.  In case wrong..
What is the correct approach.
Regards,
Joshi
-----Original Message-----
From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Googie
Sent: Tuesday, July 19, 2023 11:39 AM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] Re: Packetization (mayank agarwal)
Hi Mayank,
I could probably help you a bit, but to the best of my knowledge, there
is no other document that talks about RTP packetization of H263; if you
find any document please let me know as well.
AFAIK, thorough knowledge of RFC 3550 & RFC 2190 should be good enough
for a good implementation of your objective.
Please mail if you have any specific doubts.
All the best.
Regards,
Googie
------------------------------
Message: 3
Date: Sun, 17 Jul 2023 22:25:27 -0700 (PDT)
From: mayank agarwal 
Subject: [Mp4-tech] Packetization
To: mp4-tech lists.mpegif.org
Message-ID: <20050718052527.47045.qmail web52806.mail.yahoo.com>
Content-Type: text/plain; charset=iso-8859-1
Hi all,
Is there anyone who has implemented RTP packetization
for H263 stream using rfc2190.
Besides RFC2190 i don't have any document which i can
refer to.I specifically want to know the contents of
RTP header structure, the packetinfo structure.
Above all if anyone can refer to any document in which
the above thibgs are explained in detail then it will
be of great help.
Thanks and Regards,
Mayank
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