[asterisk-users] Video codecs: H263 & H264

[Alex Saavedra]

Jonas,

Sorry for the late response. In fact I don't rely on Asterisk settings for
video codecs, I rather prefer controlling these in specific devices. The
reason being that I experienced video codecs priorities were not always
respected by client devices. What's even funnier, for GXV3140, if I leave
H264 only, I can still receive calls using H263+. Thus I guess the answer to
your question is yes. It seems like both Asterisk and those devices are only
applying pass-through strategy for video traffic.

When using softpones (Linphone) I can enable H264, H263+ and H263. The
preferred codec seems to be used according to this order at handshake time.

HTH,

Alex Saavedra


On Fri, Dec 10, 2010 at 3:41 AM, Jonas Kellens <jonas.kellens at telenet.be>wrote:

>  On 12/08/2010 02:48 PM, Alex Saavedra wrote:
>
> Jonas,
>
>  I've been using H.264 and H.263+ with a few Grandstream GVX3140. When
> using H.264 the image quality was better, and required bandwidth appeared
> lower compared with H.263+. In fact H.264 is expected to consume less
> bandwidth for as much as 50% (according to Wikipedia). Note however that
> when configuring bandwidth limits inside Asterisk (maxcallbitrate directive)
> I saw no effect on client devices. Only client configuration succeeded (v
> 1.6.2.7 here).
>
>  I kept H.263+ only for compatibility reasons when using X-Lite softphone
> (no support for H.264).
>
>  Regards,
>
> Alex Saavedra
>
>
> Do you use H263 and H264 together on a peer ?
>
> Because when I define :
>
> allow=h263
> allow=h264
>
> there is no video.
>
> I can only allow 1 video-codec on a peer...
>
> Jonas.
>
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