gstrtpjitterbuffer: Support RTCP sender reports that arrive before the first RTP packet
Steps to reproduce:
- Launch rtspsrc pointed to a server that delivers rtp packets in the following order:
- ...RTSP handshake packets ...
- RTCP sender report
- First rtp packet
- ...all remaining rtp packets...
- Add a probe to listen for and log reference-timestamp-meta (absolute timestamps) Expected: The probe should find reference-timestamp-meta on all rtp buffers immediately after the RTCP SR is received. Actual: The probe only finds the reference-timestamp-meta after the second RTCP SR is received and processed.
Gstreamer version: 1.22 OS: MacOS