[gst-devel] How do I optimize my encoding and streaming?

Michael Joachimiak mjoachimiak at gmail.com
Tue Jun 8 08:02:50 CEST 2010

This string:
is a capabilities string (caps).
You can change the width and height there to whatever the camera supports.
call gst-inspect v4l2src to set what options you have.

Same for ffenc_flv. Call gst-inspect ffenc_flv to see what properties you
can set when calling gst-launch.
You can try to change minimal quntaizer values.

Squares are coming because of aliasing, thus changing the quantization
parameter might help.

2010/5/26 Yuval Yohai <yuval at lab-tunes.com>

> Hello all,
> I am very new to Gstreamer.
> I need to stream a video source from a firewire HD camera to a remote site
> using cellular modem. The picture quality should be as good as possible.
> Its
> size, though, could be around 640X480 or a little bigger (or wider). As of
> now I am doing my first steps using my web cam.
> I do this:
> gst-launch-0.10 -v v4l2src device=/dev/video0 !
> 'video/x-raw-yuv,width=640,height=480,framerate=30/1' ! ffenc_flv ! udpsink
> port=5000
> My output video picture is very low in quality. It seem as if the encoding
> is very rough (picture has small squares on it).
> If I do:
> gst-launch-0.10 -v v4l2src device=/dev/video0 ! ffenc_flv ! udpsink
> port=5000
> I get a 1600 X 1400 picture but then I don't know how to resize it to a
> smaller format.
> Any suggestions?
> Am I on the right track?
> Thanks,
> Yuval Yohai
> --
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Your Sincerely
Michael Joachimiak
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