Hi,<br>I try to use Telepathy-qt4 API to implement video call with GTALK protocal. <br>I called below API in my demo:<br>   QStringList clientCapabilities;<br>        clientCapabilities<br>            &lt;&lt; QLatin1String(TELEPATHY_INTERFACE_CHANNEL_INTERFACE_MEDIA_SIGNALLING &quot;/gtalk-p2p&quot;)<br>
            &lt;&lt; QLatin1String(TELEPATHY_INTERFACE_CHANNEL_INTERFACE_MEDIA_SIGNALLING &quot;/ice-udp&quot;)<br>            &lt;&lt; QLatin1String(TELEPATHY_INTERFACE_CHANNEL_INTERFACE_MEDIA_SIGNALLING &quot;/wlm-8.5&quot;)<br>
            &lt;&lt; QLatin1String(TELEPATHY_INTERFACE_CHANNEL_INTERFACE_MEDIA_SIGNALLING &quot;/video/h264&quot;)<br>            &lt;&lt; QLatin1String(TELEPATHY_INTERFACE_CHANNEL_INTERFACE_MEDIA_SIGNALLING &quot;/video/theora&quot;)<br>
            &lt;&lt; QLatin1String(TELEPATHY_INTERFACE_CHANNEL_INTERFACE_MEDIA_SIGNALLING &quot;/audio/speex&quot;);<br>
    ensureStreamedMediaCall( contactName, userActionTime,preferredHandler ) );<br>
    QList&lt;Tp::MediaStreamType&gt; request_types;<br>    request_types.append(Tp::MediaStreamTypeVideo);<br><div class="im">    request_types.append(Tp::MediaStreamTypeAudio);<br>   ret = (*mWaiter)( mChannel-&gt;requestStreams( aTarget, request_types);<br>
<br>Error log as below:<br> 
DEBUG: Received StreamedMedia.StreamError for stream 1<br> 
with error code 2 and message: &quot;&quot;<br>
Error code:<br>
Codec negotiation failed<br>
<br>
I&#39;m not sure if I need call some codec API and if I need to launch camera by myself, has telepathy packaged them and there are Available API already?<br><br>Thanks,<br>Cassie<br><br></div>