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Re: [Linphone-developers] Contract Project: 720p and 1080p support

From: Jonathan Rosser
Subject: Re: [Linphone-developers] Contract Project: 720p and 1080p support
Date: Thu, 20 Dec 2012 21:00:36 +0000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/17.0 Thunderbird/17.0

On 20/12/12 20:52, Nathan Stratton wrote:
On Thu, Dec 20, 2012 at 3:16 AM, Jonathan Rosser <
address@hidden> wrote:

This is really quite trivial. Search for ENABLE_HD in
coreapi/linphonecore.c. It's a one line patch to turn that on.

:) It looks quite trivial, but have you tried it? There are other issues of
the code, if you ENABLE_HD you can select say 720p, but the encoded video
is NOT 720p.

Yes - I am using it in a LAN scenario daily. I've heavily modified msx264 and we get low latency, 10-30Mbits of traffic and excellent quality video from semi-pro and professional video cameras. The coding quality is good enough that the limiting factor is the quality of the sensor/optics on the camera.

You need to do mods to msx264 to enable HD1080 encoding over a certain bitrate threshold - that and ENABLE_HD should get you going with the existing code quite easily. It is then necessary to specify the bitrate in the video codecs dialog to be greater than the threshold you set for 1080 encoding in msx264.

I just wish that the L16 codec would work properly and I'd have uncompressed audio to go with the nice video. The VOIP codecs are pretty poor for non-speech content.

Hope this helps,

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