RTSP-Streaming

[Nicolas Dufresne]

Le vendredi 29 septembre 2017 à 11:32 +0000, Thornton, Keith a écrit :
> Hi,
> when I stream with the following pipelines everything works as
> expected
>  
> Server
> test-launch "( videotestsrc do-timestamp=true is-live=true
> pattern=smpte horizontal-speed=5 ! video/x-
> raw,width=1920,height=1080,framerate=60000/1001,format=NV12 ! queue
> name=encode-queue max-size-bytes=124416000 ! x264enc ! video/x-
> h264,stream-format=byte-stream ! h264parse ! rtph264pay name=pay0
> config-interval=10 pt=96 )");
>  
> client
> gst-launch-1.0 -v -e rtspsrc location=rtsp://192.168.0.5:8554/live !
> rtph264depay ! h264parse ! capsfilter caps="video/x-
> h264,width=1920,height=1080,framerate=(fraction)60000/1001" !
> avdec_h264 ! identity silent=false ! fpsdisplaysink sync=true
>  
> When I implement the server in my code using the test_appsrc.c as
> muster
> The appsrc part of the pipeline is
> “( appsrc name=MyHQSrc min-latency=500000000 format=3  rtph264pay
> name=pay0 config-interval=10 pt=96 )”
>  
> The buffers arrive at the client with different timestamps from those
> which my encoder sets which are monotonously incrementing DTS and
> PTS=GST_CLOCK_TIME_NONE.
> Can it be that appsink / appsrc re-stamps the buffers with
> incrementing PTS timestamps.

The timestamp will be different, at least shifted forward a little,
unless you are using a very special setup.

>  
> The consequence is that the demuxer on the client side complains
> about decreasing timestamps every third or fourth buffer.

That's because RTP does not transport both PTS and DTS, and we don't
have any code in GStreamer to reconstruct one from another. Disable the
b-frames and the problem should go away. No more reordering.

  ... ! x264enc bframes=0 b-adapt=0 ! ...

> Grüße
>  
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