GStreamer

[Luis de Bethencourt]

On Sat, Feb 19, 2011 at 11:36 PM, Tom <fb8fb8 at gmail.com> wrote:
> Hi Luis,
> Thanks for your reply!
> I followed the instructions in the link you sent me, but I still got an
> error.
>
> If I do this:
> gst-launch v4l2src !
> video/x-raw-yuv,width=320,height=240,framerate=\(fraction\)5/1 !
> ffmpegcolorspace ! jpegenc ! multipartmux ! tcpserversink host=192.168.2.1
> port=5000
> Then the error is:
> (gst-launch-0.10:8222): GLib-WARNING **: g_set_prgname() called multiple
> times
> Setting pipeline to PAUSED ...
> ERROR: Pipeline doesn't want to pause.
> ERROR: from element /GstPipeline:pipeline0/GstV4l2Src:v4l2src0: Cannot
> identify device '/dev/video0'.

Cannot identify device...
Are you sure your webcam works?

what happens when you do:
gst-launch-0.10 v4l2src ! autovideosink

If your webcam works you should see the video from it displayed in your desktop.

Alternatively, install cheese an application to take pictures and
videos from your webcam, and see if it works.

Luis

> Additional debug info:
> v4l2_calls.c(482): gst_v4l2_open ():
> /GstPipeline:pipeline0/GstV4l2Src:v4l2src0:
> system error: No such file or directory
> Setting pipeline to NULL ...
> Freeing pipeline ...
>
> So I guess video/x-raw-yuv,width=320,height=240 should be a file in my
> current folder so I change it to 1.MPG that is a mpeg file in my current
> folder.
> Then the error is:
> (gst-launch-0.10:8227): GLib-WARNING **: g_set_prgname() called multiple
> times
> WARNING: erroneous pipeline: link without source element
>
> I am totally confused....Just started learning stream a few days ago and I
> am not familiar with Linux...
>
> So what do you think I should revise in the above command gst-launch?
> Would you please give me some specific suggestion? Thank you very much! I am
> really a "newbie" in this area :)
>
> Tom
>
>
> ---------------------------------------------------------------------
> http://wiki.laptop.org/go/GStreamer#Doing_live_streaming_video_from_an_xo
> It would be better to use rtp... but this link will get you a feel for
> streaming.
>
> Luis