udp audio streaming issue

[Nicolas Dufresne]

Le mercredi 06 février 2019 à 10:00 -0600, pradeep.linux a écrit :
> Thanks Tim.
> 
> When i try to do live streaming(audio + video ) from sender to receiver,
> there is video & audio lag of ~500 ms to 1second at receiver. Can you Please
> suggest on how to correct this?. Also please suggest how to get rid of
> slight jitter in video at receiver.
> 
> Below are my pipelines.
> 
> *sender:(db820c)*
> gst-launch-1.0 -e v4l2src device=/dev/video10 ! videoconvert !
> video/x-raw,format=NV12,width=1280,height=720 ! v4l2h264enc
> extra-controls="controls,h264_profile=4,video_bitrate=10000000;" ! h264parse

Nitpick: You should use caps negotiation to setup profile and level.

> config-interval=10 ! queue ! mpegts. alsasrc name=hello1 ! webrtcdsp
> echo-cancel=true noise-suppression=true ! webrtcechoprobe !

Hmm, you'll have to tell me what you are trying to suppress here. And
echo probe should be placed into another branch of your pipeline, next
to where you have loud speaker playback (alsasink/pulsesink). Though,
using noise-supression should work, you don't need an echo probe for
that.

> 'audio/x-raw,format=S16LE, rate=48000' ! queue max-size-time=20000000000
> max-size-bytes=204857600 max-size-buffers=3000 ! volume volume=10.0 ! level
> ! audioconvert ! avenc_aac ! aacparse ! mpegts.  mpegtsmux name=mpegts

Latency wise the choice of MPEG TS isn't a great choice. To be
compliant, the receiver will need to introduce 700ms latency. I would
rather use an RTP pipeline (just rtp payload on sender and
rtpjitterbuffer on receiver as a first iteration).

> alignment=7 ! udpsink host=192.168.51.6 port=5000
> 
> *Receiver:(my laptop)*
> gst-launch-1.0 -e -v udpsrc port=5000 ! tsdemux name=demux demux. ! queue
> max-size-bytes=0 max-size-buffers=0 max-size-time=0 leaky=downstream !
> h264parse ! avdec_h264 ! videoconvert ! autovideosink  demux. ! queue
> max-size-bytes=0 max-size-buffers=0 max-size-time=0 leaky=downstream  !
> aacparse ! avdec_aac ! audioconvert ! autoaudiosink 
> 
> Thanks,
> Pradeep
> 
> 
> 
> --
> Sent from: http://gstreamer-devel.966125.n4.nabble.com/
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