[gst-devel] Upstream event or bus for RTCP info to video encoder?

[Qin Chen]

Hi experts,

I am writing a video streaming application. I used gstrtpbin for RTP/RTCP
packet transmission.

Furthermore, at the sender side, I would like to adapt video encoding
parameters according to RTCP receiver report QoS statistics. The sender
pipeline is shown below. In the pipeline, identity element is used to probe
RTCP packets for QoS statistics.

 * .-------.    .-------.    .-------.      .----------.     .-------.
 * |v4l2   |    |x264enc|    |h264pay|      | rtpbin   |     |udpsink|  RTP
 * |      src->sink    src->sink    src->send_rtp send_rtp->sink     |
port=5000
 * '-------'    '-------'    '-------'      |          |     '-------'
 *                                          |          |
 *                                          |          |     .-------.
 *                                          |          |     |udpsink|  RTCP
 *                                          |    send_rtcp->sink     |
port=5001
 *              .-------.    .--------.     |          |     '-------'
sync=false
 *    RTCP      |udpsrc |    |identity|     |          |
async=false
 *    port=5005 |      src->sink     src->recv_rtcp    |
 *              '-------'    '--------'     '----------'
 */

My question is, what is the best way to send the QoS statistics obtained
from identity element to x264enc element (directly or indirectly)?

>From the GStreamer manual, it seems that upstream event could be a candidate
since it can be used for application-element interaction. And bus is used
for application-pipeline interaction. So which one is more suitable here and
where can I find similar examples? Thanks in advance.

Regards,

Qin
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