Seven Du said:
> the codec doesn't change resolution, the source does. so if you record a conference to send rtmp, change the conference canvas size. or you can try explicitly set the size e.g. record {vw=320,vh=240}rtmp://url... attach a log if it still not working.

We initially tried to set the rtmp resolution via "video-canvas-size" in conference.conf.xml...

Dialplan snippet:
<action application="record_session" data="{modname=mod_av}rtmp://${ipOfPeerInCluster}:5150/viewOfUser/${idOfClientSession}"/>
<action application="conference_set_auto_outcall" data="['conference_member_flags=endconf,jitterbuffer_msec=5p:100p']sofia/gateway/asterisk/${example_destination}"/>
<action application="conference" data="${example_destination}@example_conference+flags{endconf|mintwo}"/>

conference.conf.xml snippet:
<profile name="example_conference">
  <param name="domain" value="$${domain}"/>
  <param name="rate" value="8000"/>
  <param name="channels" value="2"/>
  <param name="interval" value="20"/>
  <param name="energy-level" value="0"/>
  <param name="caller-controls" value="none"/>
  <param name="caller-id-name" value="$${outbound_caller_name}"/>
  <param name="caller-id-number" value="$${outbound_caller_id}"/>
  <param name="comfort-noise" value="false"/>
  <param name="conference-flags" value="video-floor-only|rfc-4579|livearray-sync|minimize-video-encoding"/>
  <param name="video-mode" value="mux"/>
  <param name="video-layout-name" value="1x1"/>
  <param name="video-canvas-size" value="320x240"/>
  <param name="video-canvas-bgcolor" value="#333333"/>
  <param name="video-layout-bgcolor" value="#000000"/>
  <param name="video-codec-bandwidth" value="1mb"/>
  <param name="video-fps" value="15"/>
  <param name="max-members" value="2"/>
<!--      <param name="terminate-on-silence" value="5"/> -->
  <param name="endconf-grace-time" value="5"/>
</profile>

...and then we tried the av.conf.xml change that I already mentioned. I'm not sure I need {modname=mod_av} in front of my rtmp url, but in case I do, I adopted your suggestion in this way:

New change to dialplan snippet:
<action application="record_session" data="{modname=mod_av,vw=320,vh=240}rtmp://${ipOfPeerInCluster}:5150/viewOfUser/${idOfClientSession}"/>

...And it worked! I wonder why this works and the conference.conf.xml setting doesn't.

Thanks!