[Mp4-tech] [Video] H.263 maximum encoded frame size

[Mody, Mihir]

Hi,
H.263 specifies maximum frame size by means of "BPPmaxKb" parameter.
BPPmaxKb defines the maximum frame size  in terms of 1024 bits units.
The standard specifies table for BPPMaxKb, which is dependent
resolution. For QCIF, value of BPPmaxKb is 64 units, which translates
into 8 Kbytes.
Regards,
Mihir Mody,
Multimedia codec group,
Texas instruments India ltd.
Bangalore, India 
________________________________
From: mp4-tech-bounces lists.mpegif.org
[mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of Strong Qu
Sent: Wednesday, July 20, 2023 6:51 PM
To: mp4-tech lists.mpegif.org
Subject: [Mp4-tech] [Video] H.263 maximum encoded frame size
Hi,
Does any body know whether there is limitation for maximum H.263 frame
size? For mpeg4 simple profile QCIF the spec said:
ISO/IEC 14496-2:2003(E) \ Annex D: Video buffering verifier \ D.2 Video
Rate Buffer Model Definition clause 10:
The number of bits used for coding any single VOP, di, shall not exceed
k * 16384 bits, where k = 4 for QCIF and Sub-QCIF, k = 16 for CIF, k =
32 for 4CIF, and k = 64 for 16CIF, unless a larger value of k is
specified in the profile and level definition.
For QCIF, k=4. So maximum encoded frame size should be 8k bytes.
Does H.263 comply with the same rule? How about H.264? How about the
compatibility between H.263 and Mpeg4? I found an article referred by
others:
San Jose meeting, Feb. 1998. 10. French National Body, "Compatibility
Between MPEG-4 and H263", ISO/IEC. JTC/SC29/WG11 MPEG98/3065
But I don't where I could get it. Is it published? Thanks in advance.
Regards,
Strong Qu 
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