Hello list,
we've had some trouble with video quality with H.263, which
does not
seem to be optimal.
A guy from radvision states here
( http://www.commsdesign.com/design_corner/OEG20030128S00
10 ):
"The 3G-324M standard calls out the H.263 codec as
mandatory and MPEG-4
as recommended codec for video processing. However, MPEG-4
is the
3G-324M standard de-facto used by all major supporting
vendors.
Resiliency and high efficiency make MPEG-4 codec
particularly well
suited for 3G-324M."
He continues by praising the error resilience features of
MPEG4 part2:
"As stated above, error resilience is achieved through
resynchronization, byte alignment, data partitioning the
reversible
variable length code (RVLC), adaptive intra refresh (AIR),
and error
detection and concealment. Let's look at each of these in
more detail."
Having read that, we'd like to use MPEG4 part 2 simple
profile 1 level 0
as the video codec.
Looking at this patch (http://bugs.d
igium.com/view.php?id=8663) from
2006, Asterisk should already be able to pass MPEG4 part2
video.
As support for this MPEG4 part 2 codec is not mandatory,
every video
played must be available in both formats, and there must be
a way to
select the respective file according to the video codec
negotiated by
H.245.
Furthermore, there is the need for an asterisk app to play
and save
MPEG4.
The only mails I found in the Asterisk Video archive
( http://www.asteriskguru.com/archives/asterisk-vid
eo-how-to-integrate-mpeg4visual-h264-mpeg4-p-vt108615.html?h
ighlight=mpeg4 and http://www.asteriskguru.com/archives/asterisk-vide
o-integrating-mpeg4-video-codec-in-asterisk-vt85784.html?hig
hlight=mpeg4 ) are not really helpful.
So, my questions are:
Has anybody ever done it?
Is there any patch?
Are there any Experiences?
Are there other things needed to change?
Is this guy from radvision right? Do most mobile phones
really support
MPEG4 part2 and has it really better video quality?
Every answer is welcome! 
Kind regards,
Florian
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