[Mp4-tech] [Video] Conformance test stream asserts

[toshi.horie conexant.com]

Dan,
        All of the conformance bitstreams you mentioned are obsolete 
because they have problems.  They have unrestricted motion vectors even 
though 14496-2, section 7.6.4 says "Motion vectors are allowed to point 
outside the decoded area of a reference VOP when (and only when) the short 
video header format is not in use (i.e., when short_video_header is 0)." 
The problem is documented in N6185_VP11.doc "MPEG-4 Visual: List of 
Problems Reported, v.11."  The corresponding Excel spreadsheet reports the 
status of all the MPEG-4 visual conformance bitstreams.
Regards,
Toshi Horie
Conexant Systems
"Dan Searles" <dsearles mmc.atmel.com>
Sent by: mp4-tech-bounces lists.mpegif.org
05/10/2023 10:59 AM
        To:     mp4-tech lists.mpegif.org
        cc: 
        Subject:        [Mp4-tech] [Video] Conformance test stream asserts
Regarding the Microsoft version 2.5 reference code mentioned earlier...
Conformance streams nec008, san021/22/23/24 generate the following:
Assertion failed: vctDecode.x+iMBX*32>=0 && 
vctDecode.x+iMBX*32<=(m_iNumMBX-1)*3
2, file c:\mpeg4\ms_v25\sys\decoder\mvdec.cpp, line 164
(or line 165)
Is this just a matter of using obsolete conformance streams, or is 
something
else going on? Is there a document or something anywhere that would
indicate current status of conformance streams?
Thanks
-- 
Dan Searles
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