Rtsp server. Synchronize audiotestsrc with live video stream.

[alexey burov]

Hi, all!

There is a rtsp server. The rtsp server gets stream from a panaramic camera
(two video streams and one audio stream).
Sometimes the camera can send only video streams without an audio stream. In
this case I want to send fake audio stream (silence) to player.
I use following pipeline in rtsp server:

tcpserversrc host="{tcphost}" port={tcpport} ! tsdemux name=d \
d.video_0022 ! queue ! rtph264pay name=pay0 \
d.video_0023 ! queue ! rtph264pay name=pay1 \
audiotestsrc wave=silence is-live=true name=silence ! mulawenc ! rtppcmupay
name=pay2

gst-play-1.0 can play video from the rtsp server.
But ffplay and vlc doesn't play video from the rtsp server and I see an
error (seek failed) in log of the rtsp server:


0:00:01.845274915 14125      0x1362f20 WARN                 basesrc
gstbasesrc.c:1629:gst_base_src_perform_seek:<silence> duplicate event found
646
0:00:01.845755009 14125      0x1362f20 WARN                 tsdemux
tsdemux.c:891:gst_ts_demux_srcpad_event: seeking failed
0:00:01.845959050 14125      0x1362f20 WARN                 tsdemux
tsdemux.c:891:gst_ts_demux_srcpad_event: seeking failed
0:00:01.846171582 14125      0x1362f20 WARN                 tsdemux
tsdemux.c:891:gst_ts_demux_srcpad_event: seeking failed
0:00:01.846308130 14125      0x1362f20 WARN                 tsdemux
tsdemux.c:891:gst_ts_demux_srcpad_event: seeking failed
0:00:01.846421559 14125      0x1362f20 ERROR             rtspclient
rtsp-client.c:1260:handle_play_request: client 0x13f50c0: seek failed
0:00:01.847500207 14125      0x1362f20 WARN               rtspmedia
rtsp-media.c:4073:gst_rtsp_media_set_state: media 0x7fdd10058300 in error
status while changing to state 1
0:00:01.847612518 14125      0x1362f20 WARN               rtspmedia
rtsp-media.c:4073:gst_rtsp_media_set_state: media 0x7fdd10058300 in error
status while changing to state 1


As I understand I need to synchorinze audio from audiotestsrc with video.
But I can't understand how can I do it. 

How can I synchorinze audiotestsrc with video streams from camera and at
what point does it have to be done??

Any advice will be appreciate. 
Thank you for advance.




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