[Ekiga-list] black video sent from ekiga on linux mint

[Alex Frase <atf3 psu edu>]

Hi,

(Apologies if this ends up posting twice; I sent it before subscribing 
and it may have gotten lost in moderation)

I'm trying to use Ekiga v4.0.1 on Linux Mint 15 (based on Ubuntu, based 
on Debian) but can't seem to transmit video via h.323.

I am able to connect to two different h.323 endpoints, and in both cases 
I can see and hear the other side just fine, and they can hear me, but 
they see only a black screen instead of the video from my side.

I know that the camera works and Ekiga recognizes it, because I can see 
my own video preview picture-in-picture. Skype also works just fine for 
both audio and video in both directions.

I can also successfully call the ekiga.net echo test 
(sip:500 ekiga net), and I see my video echo (with a slight delay vs. my 
local video picture-in-picture), so it seems to work okay via SIP. It's 
just over h.323 that the other side does not receive my video.

While connected via h.323, the call tooltip says "Codecs: PCMU - H264"; 
when I call the echo test via SIP, the tooltip instead says "Codecs: 
PCMA - H261". I've tried disabling the H264 video codec, but then the 
remote side reports not even seeing a black screen -- instead they just 
see their own camera on the whole screen, as if no video signal is being 
received by them whatsoever. When the H264 codec is enabled, then they 
see their video picture-in-picture on top of a black screen. So perhaps 
the problem is the H264 encoder producing only black frames?

Thanks for any suggestions,
-alex