GStreamerRTP video stream Duplex audio and lag issue

[Dmitri Afanasjev]

Hello!
I would suggest using some kind of h268 hardware as gstreamer stream
source. For instance using Logitech c920 webcam in my project significantly
reduced video lag. In cooperation with rtpjitterbuffer I have ~200-300 ms
of lag

Regards, Dmitri

On Tue, Jun 16, 2015, 6:27 PM Nicolas Dufresne <
nicolas.dufresne at collabora.com> wrote:

> Le mardi 16 juin 2015 à 17:58 +0530, Apurv Saraf a écrit :
> > hi all
> > We are developing a video chatting app using GStreamer. We have been
> > able to send and receive videos using the following pipelines(one
> > system is iOS simulator in Xcode and other is ubuntu).
> >
> > On mac we are using :
> > pipeline = gst_parse_launch("videotestsrc ! video/x
> > -raw,width=640,height=480 ! x264enc ! h264parse ! rtph264pay !
> > udpsink host=192.168.100.3 port=5000 udpsrc port=9078
> > caps=\"application/x-rtp,payload=96,encoding-name=H264\" ! queue !
> > rtph264depay ! h264parse ! decodebin ! autovideosink", &error);
> > On ubuntu we are using:
> > gst-launch-1.0 udpsrc port=5000 caps=\"application/x-rtp, payload=96,
> > encoding-name=H264\" ! queue ! rtph264depay ! h264parse ! decodebin !
> > autovideosink videotestsrc ! video/x-raw,width=640,height=480 !
> > x264enc ! h264parse ! queue ! rtph264pay ! udpsink host=192.168.100.4
> > port=9078
>
> You should learn a bit about RTP streaming and study each element you
> are using, that would help. As a hint, in an RTP pipeline it is
> recommended that the receiver uses rtpjitterbuffer to compensate for
> network jitter, and give some time for downstream element to decode by
> adding latency (configurable.).
>
> Second big problem, you are using x264enc with default setup. The
> default is near what we would use for encoding DVDs. Considering using
> at least the zerolatency preset (tune=zerolatency). Other thing you may
> want to configure is that delay of key frame repetition, or otherwise
> look forward using rtpbin, which let you enable more RTP features.
> Again, learn about these elements, their configuration and how this
> should be configured for live usage.
>
> Nicolas
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>
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