[h323plus] OpenMCU 4CIF Issues

Simon Horne s.horne at packetizer.com
Fri Jul 4 20:12:23 EDT 2008


BitRate and FrameRate reversed in PacPhone? That a display issue. Well I
better fix that. :-)

The issue is in the ffmpeg decoder library. From past discussions it a
setting issue in the library however the person who found the issue never
contributed it back to the project. A contribution to fix the issue from
anyone would be very most welcomed.

  -----Original Message-----
  From: Adrien Rudulier [mailto:rudz04 at yahoo.ca]
  Sent: Saturday, 5 July 2008 6:41 AM
  To: Simon Horne; h323plus at lists.packetizer.com
  Subject: Re: [h323plus] OpenMCU 4CIF Issues


  I tried using PacPhone v2.0.5 but I couldn't connect to openMCU. I also
found that in the Video settings the bitrate and framerate configurations
are reversed. Also, I am using an analog HD camera through a usb capture
card that supports up to 4CIF but I could only transmit QCIF or VGA.

  Do you think the error with PVX and OpenMCU is in the ffmpeg decoder, an
un-expected header, or some other reason?


  ----- Original Message ----
  From: Simon Horne <s.horne at packetizer.com>
  To: Adrien Rudulier <rudz04 at yahoo.ca>; h323plus at lists.packetizer.com
  Sent: Thursday, July 3, 2008 7:59:42 PM
  Subject: RE: [h323plus] OpenMCU 4CIF Issues


  There are known outstanding issues with h323plus H.263 and Polycom PVX and
  If anyone can assist in resolving these issues, a contribution would be
greatly appreciated.

  You can try using PacPhone it supports 4CIF and is built off h323plus.

    -----Original Message-----
    From: h323plus-bounces at lists.packetizer.com
[mailto:h323plus-bounces at lists.packetizer.com]On Behalf Of Adrien Rudulier
    Sent: Friday, 4 July 2008 6:36 AM
    To: h323plus at lists.packetizer.com
    Subject: [h323plus] OpenMCU 4CIF Issues

    I am currently using the newest versions (as of July 2, 2008) of
ptlib(2.3.0), h323plus(1.20.5) and openmcu(2.2.4) from cvs on Ubuntu 8.04. I
installed the plugins correctly and openmcu runs fine. However when using
two polycom pvx clients to connect to openmcu using H.263 at 4CIF for both
transmitting and receiving, the video is blocky and very distorted. There is
no packet loss, the bitrate is set to 1920 kbps and the frame rate is a
constant 30 fps for both transmitting and receiving. I was wondering if the
problem is with openmcu or the pvx clients. Has anyone successfully used
4CIF resolution to be clear and smooth? Also, I had to massage the h.263
plugin code to get 4CIF to work with openmcu. Any help would greatly be

    Adrien Rudulier

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