Count the total number of RTP sources found in the meta of buffer, which will be automically added by gstrtp.rtpbase_payload.RTPBasePayload.allocateOutputBuffer. If #GstRTPBasePayload:source-info is false the count will be 0.
a #GstBuffer, typically the buffer to payload
The number of sources.
Count the total number of RTP sources found in the meta of buffer, which will be automically added by gstrtp.rtpbase_payload.RTPBasePayload.allocateOutputBuffer. If #GstRTPBasePayload:source-info is false the count will be 0.