Re: [Opalvoip-devel] H.323 video-size and resolution downgrade bug

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This is a nasty problem, coming about due to a legal, but a bit odd, configuration of the Polycom.

If you look at the TCS, you can see that the "main" video is, as you say at level 2.1 (parameter 42 is 50) however ,there is an extended video capability for H.264 that has level 3.1. Extended video is typically used for things like "slide show" secondary video.

The problem is that OPAL only has one H.264 capability (one per fundamental format) for a connection, and thus cannot distinguish between the "main" or the "extended" video. Whatever is later in the TCS is what gets used.

It is a difficult problem and one for which I cannot think of a quick fix for. :-(

----------
Robert Jongbloed
Vox Lucida Pty. Ltd.

-----Original message-----
From: Alexander Sbitnev
Sent: Wednesday, 27th April 2016, 17:11
To: opa...@li...
Subject: [Opalvoip-devel] H.323 video-size and resolution downgrade bug

   Got another problem with polycom and conopal. It happens if I 
manually setup preferred video resolution (720p) in conopal and connect 

to Polycom which can only receive a smaller video resolution (h264 level 
2.1) but can send a higher resolution (720p). As result during 
negotiations and startup phase mediaformat and encoder first downgrade 

to CIF:

   0:00.209          H.245 Handler:16421     mediafmt.cxx(1331) 
MediaFormat     Merging H.264-1 into H.264-1
   0:00.209          H.245 Handler:16421     mediafmt.cxx(1331) 
MediaFormat     Merging H.264-1 into YUV420P
   0:00.209          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Frame Height" from "720" to "576"
   0:00.209          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Frame Width" from "1280" to "352"
   0:00.209          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Max Bit Rate" from "1382400000" to 
"1024000"
   0:00.209          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Max Rx Frame Height" from "1080" 
to "576"
   0:00.209          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Max Rx Frame Width" from "1920" to 
"352"
....
   0:00.263          H.245 Handler:16421    h264-x264.cxx(773) 
x264            Applied options: prof=66 lev=21 res=352x576 fps=30 
bps=1000000 period=1000 RTP=1400 NALU=1400 TSTO=31 Mode=1

  and next get back to 720p:

   0:00.269          H.245 Handler:16421     mediafmt.cxx(1331) 
MediaFormat     Merging H.264-1 into H.264-1
   0:00.269          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Frame Height" from "576" to "720"
   0:00.269          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Frame Width" from "352" to "1280"
   0:00.269          H.245 Handler:16421     mediafmt.cxx(1331) 
MediaFormat     Merging H.264-1 into YUV420P
   0:00.269          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Frame Height" from "576" to "720"
   0:00.269          H.245 Handler:16421     mediafmt.cxx(266) 
MediaFormat     Changed media option "Frame Width" from "352" to "1280"
....
   0:00.286          H.245 Handler:16421    h264-x264.cxx(773) 
x264            Applied options: prof=66 lev=21 res=1280x720 fps=6 
bps=1000000 period=1000 RTP=1400 NALU=1400 TSTO=31 Mode=1

As result tx video frame failing with a incorrect buffer size:

   0:00.346               Tx video:16463  rtp_session.cxx(1257) 
RTP             Session 2, SSRC=321345223 (0x132756c7), sending (forced) 
empty ReceiverReport
   0:00.346               Tx video:16463  rtp_session.cxx(1299) 
RTP             Session 2, SSRC=321345223 (0x132756c7), sending SDES 
cname="dl056bmuVh+UNLzue1xTfQ"
   0:00.346               Tx video:16463  rtp_session.cxx(1409) 
RTP             Session 2, sent 1 forced reports: status=1
   0:00.346          H.245 Handler:16421 opalpluginmgr.cx(625) 
OpalPlugin      Setting encoder options: H.264-1 res=1280x720 target=960000
   0:00.346               Tx video:16463    mediastrm.cxx(1329) 
Media           Tried to read with insufficient buffer size - 304160 < 
1382400
   0:00.346               Tx video:16463        patch.cxx(781) 
Patch           Thread ended because source read failed on 
14OpalMediaPatch[0x7fa3000e65e0] 
20OpalVideoMediaStream[0x7fa30011c5b0],Source,YUV420P,2 -> 
18OpalRTPMediaStream[0x7fa30007b5c0],Sink,H.264-1,2

Full logs and packet dumps I will send directly to Robert and anyone 
else interested.

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