[sip-comm-dev] Improving Video Quality


#1

Hi All,

Can anyone provide some suggestions to improve the video quality of sip-comm. Even on high bandwidth n/w the quality of video chat between two clients is not decent enough.
Any suggestions on how to tweak the code/configurations to get better video quality are welcome.

Thanks,
Apurv


#2

Hi Apurv,

We are aware of video quality problem.

I work on desktop streaming/sharing and improving video quality is part of this work so stay tuned.

Best regards,

···

--
Sebastien Vincent

Apurv Agnihotri a écrit :

Hi All,

Can anyone provide some suggestions to improve the video quality of sip-comm. Even on high bandwidth n/w the quality of video chat between two clients is not decent enough.

Any suggestions on how to tweak the code/configurations to get better video quality are welcome.

Thanks,

Apurv


#3

There are many components involved in streaming video between two
clients so I think the answer isn't straightforward.

To start with, check the quality of the video capture on your
operating system and camera with various applications. For example, on
my Linux the capture in Cheese doesn't look great so I don't really
expect it to be better in SIP Communicator. Compare the quality of the
video capture in SIP Communicator and the other applications. The
video preview in the Media (new) configuration form should give you a
rough idea but keep in mind that the video rendering is affected by
the scaling so it could look disgusting in the video preview (as it
looks on my Windows) and still look better while in a call. You could
also resize your call window while streaming to see if it changes the
quality in any way.

Then, of course, compare the various video codecs. For example, H.264
is supposed to be pretty decent. A tiny chance of improvement is to
update FFmpeg and x264 to the latest releases (the changelog of
HandBrake mentioned that it got boosted H.264 support partly thanks to
recent changes in x264).

Also take into consideration how the quality of the received video
changes in different applications i.e. when you steam video with SIP
Communicator, look at how it appears not only in SIP Communicator but
in other applications as well. It's necessary again because of the
differences in the video rendering in SIP Communicator on the various
operating systems (as I pointed out above). Once again, you could
resize the call window while receiving to see it it changes the
quality in any way.

In the future, please provide details with respect to your operating
system, the video codec you're using when you're reporting issues with
video in order to avoid the roundtrips of us asking.

···

On Fri, Dec 4, 2009 at 11:50 AM, Apurv Agnihotri <Apurv_Agnihotri@infosys.com> wrote:

Hi All,

Can anyone provide some suggestions to improve the video quality of
sip-comm. Even on high bandwidth n/w the quality of video chat between two
clients is not decent enough.

Any suggestions on how to tweak the code/configurations to get better video
quality are welcome.

Thanks,

Apurv

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