raw video and udpsink: works only with 160x120

[Mailing List SVR]

Hi all,

I'm trying to send raw video over udpsink, this pipeline works perfectly,

sender:

gst-launch-0.10 -v v4l2src ! queue ! videorate ! 'video/x-raw-yuv,format=(fourcc)I420,framerate=5/1' ! videoscale ! 'video/x-raw-yuv,format=(fourcc)I420,width=160,height=120' ! udpsink

receiver:

gst-launch-0.10 -v udpsrc caps="video/x-raw-yuv, format=(fourcc)I420, width=(int)160, height=(int)120, framerate=(fraction)5/1" ! autovideosink

but if i try to change width and height doesn't work anymore,

sender:

gst-launch-0.10 -v v4l2src ! queue ! videorate ! 'video/x-raw-yuv,format=(fourcc)I420,framerate=5/1' ! videoscale ! 'video/x-raw-yuv,format=(fourcc)I420,width=320,height=240' ! udpsink

with tcpdump I don't see any packet on lo interface,

any hints,

thanks
Nicola

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[Tim-Philipp Müller-2]

On Tue, 2009-10-20 at 09:47 +0200, Mailing List SVR wrote:

Hi,

> I'm trying to send raw video over udpsink, this pipeline works perfectly,
>
> gst-launch-0.10 -v v4l2src ! queue ! videorate !
>  'video/x-raw-yuv,format=(fourcc)I420,oadframerate=5/1' ! videoscale !
>  'video/x-raw-yuv,format=(fourcc)I420,width=160,height=120' ! udpsink
>
> ...
>
> but if i try to change width and height doesn't work anymore,
>
> gst-launch-0.10 -v v4l2src ! queue ! videorate !
>  'video/x-raw-yuv,format=(fourcc)I420,framerate=5/1' ! videoscale !
>  'video/x-raw-yuv,format=(fourcc)I420,width=320,height=240' ! udpsink
>
> with tcpdump I don't see any packet on lo interface,

There's a maximum UDP packet size, IIRC it's around 64 kB, but may well
be different. You could try using an RTP payloader/depayloader (e.g.
rtpvrawpay) on each end.

 Cheers
  -Tim



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