Re: ohphone / h263rfc21930 video problem

["Dan Julius" <dan.julius@xxxxxxxxx>]

Progress update:

I was able to write a proxy which I call from H323_RFC2190_H263Codec::RtpCallback to re-packetize the libavcodec output stream using only Mode A packets. This seems to do the trick with the RVGW.

Dan

On 2/22/07, Dan Julius <dan.julius@xxxxxxxxx> wrote:

hi,

I can't really be sure which model is being used since it is hosted by the service provider. I am trying to use ohphone instead of their netmeeting based client. I will try to ask around. I know it is a radvision gatekeeper because it identifies as RVGK.

I'd be happy to take on the programming task, but I could use some guidance since I don't really have much experience with video encoding or h263.

Which part of the standard do you think is not supported? and what approach would you recommend?

thanks,
Dan

On 2/22/07, GT < gravsten@xxxxxxxxx> wrote:

Hi,

> I'm trying to use ohphone to communicate with a 3g phone via a Radvision
> gateway,
> and am having problems with the video stream. It seems as if some of the
> images I'm sending only get partially decoded (top lines remain black) or
> have specific blocks which look bad.

RADVision equipment is probably at fault (please tell us which model/revision
you are using?), given that several of their products do not fully comply to
the ITU/IETF standards. Unfortunately, this is a fairly common problem among
H.263 codecs, as you can see here: http://www.salyens.com/interop/

> When using netmeeting instead of ohphone everything works ok. I also checked
> conferencing between ohphone and netmeeting which works fine.
> Any ideas what I should be looking for?

If NetMeeting works well with said RADVision equipment, then I have a good idea
of which part of the ITU/IETF standards the RADVision equipment does not
conform to. OhPhone and other OpenH323 applications will not work
out-of-the-box with it, I am afraid.

Unless you have programming talent, I suggest to call up RADVision and ask for
an updated firmware or a refund.

Regards,

_______________________________________________________________________

                           Salyens - Video streaming and VoIP solutions
                                                 http://www.salyens.com/



____________________________________________________________________________________
It's here! Your new message!
Get new email alerts with the free Yahoo! Toolbar.
http://tools.search.yahoo.com/toolbar/features/mail/