Video seems to not be transmitted over h323 using H264

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Hello,

I am experiencing a problem similar to what is decribed in this older
thread:
black video sent from ekiga on linux mint
https://mail.gnome.org/archives/ekiga-list/2013-September/thread.html#00040

In short, on my work computer I have two different versions of Ubuntu
installed, with roughly the same setup. I am connecting using H323 to a
specific endpoint and I am getting different behavior.

On my older Ubuntu 16.04 distro, everything looks good, I (and others) can
see the image from my webcam. On my newer Ubuntu 18.04 (Kubuntu actually),
the image from my webcam seems to be completely black and this is confirmed
by other participants, note that I can see their image fine. On this newer
distro, the problem disappears if I deactivate h264 (and h263) and revert
to h261 (although the image is at quite lower resolution. If I just test
the webcam using the preview  or try to see the local stream during a
meeting it works fine.

I tried debugging the ekiga sessions using '-d 4', I was only able to spot
some FFMPEG errors in the case of my newer distro ("FFMPEG  non-existing
PPS 0 referenced" and then "FFMPEG  decode_slice_header error").

Here are the 2 debugging outputs.

Ubuntu 16.04 Xenial: https://paste.ubuntu.com/p/HJF4Sfwq5y/
Ubuntu 18.04 Bionic: https://paste.ubuntu.com/p/MFkhmnGPk5/

Best regards,
Antoine Merle.

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<div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div dir=3D"ltr"><div di=
r=3D"ltr"><div dir=3D"ltr"><div class=3D"gmail_default" style=3D"font-famil=
y:arial,helvetica,sans-serif">Hello,</div><div class=3D"gmail_default" styl=
e=3D"font-family:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_=
default" style=3D"font-family:arial,helvetica,sans-serif">I am experiencing=
 a problem similar to what is decribed in this older thread:<br></div><div =
class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif">bl=
ack video sent from ekiga on linux mint</div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif"><a href=3D"https://mail.gno=
me.org/archives/ekiga-list/2013-September/thread.html#00040">https://mail.g=
nome.org/archives/ekiga-list/2013-September/thread.html#00040</a></div><div=
 class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif"><=
br></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,=
sans-serif">In short, on my work computer I have two different versions of =
Ubuntu installed, with roughly the same setup. I am connecting using H323 t=
o a specific endpoint and I am getting different behavior.</div><div class=
=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif"><br></d=
iv><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-s=
erif">On my older Ubuntu 16.04 distro, everything looks good, I (and others=
) can see the image from my webcam. On my newer Ubuntu 18.04 (Kubuntu actua=
lly), the image from my webcam seems to be completely black and this is con=
firmed by other participants, note that I can see their image fine. On this=
 newer distro, the problem disappears if I deactivate h264 (and h263) and r=
evert to h261 (although the image is at quite lower resolution. If I just t=
est the webcam using the preview=C2=A0 or try to see the local stream durin=
g a meeting it works fine.</div><div class=3D"gmail_default" style=3D"font-=
family:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_default" s=
tyle=3D"font-family:arial,helvetica,sans-serif">I tried debugging the ekiga=
 sessions using &#39;-d 4&#39;, I was only able to spot some FFMPEG errors =
in the case of my newer distro (&quot;FFMPEG=C2=A0 non-existing PPS 0 refer=
enced&quot; and then &quot;FFMPEG=C2=A0 decode_slice_header error&quot;).<b=
r></div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,s=
ans-serif"><br></div><div class=3D"gmail_default" style=3D"font-family:aria=
l,helvetica,sans-serif">Here are the 2 debugging outputs.<br></div><div cla=
ss=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif"><br><=
/div><div class=3D"gmail_default" style=3D"font-family:arial,helvetica,sans=
-serif">Ubuntu 16.04 Xenial: <a href=3D"https://paste.ubuntu.com/p/HJF4Sfwq=
5y/">https://paste.ubuntu.com/p/HJF4Sfwq5y/</a><br><div class=3D"gmail_defa=
ult" style=3D"font-family:arial,helvetica,sans-serif">Ubuntu 18.04 Bionic: =
<a href=3D"https://paste.ubuntu.com/p/MFkhmnGPk5/">https://paste.ubuntu.com=
/p/MFkhmnGPk5/</a></div></div><div class=3D"gmail_default" style=3D"font-fa=
mily:arial,helvetica,sans-serif"><br></div><div class=3D"gmail_default" sty=
le=3D"font-family:arial,helvetica,sans-serif">Best regards,<br></div><div c=
lass=3D"gmail_default" style=3D"font-family:arial,helvetica,sans-serif">Ant=
oine Merle.<br></div></div></div></div></div></div></div>

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