[gmail] how to "stream a video" on a Linux PC?

[Stefan Kost]

On 20.02.2011 01:33, Tom wrote:
> 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'.
> 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 ...

What are these command reporting:
ls /dev/video*
v4l-info
>
> 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.
No, "video/x-raw-yuv,width=320,height=240"is a capsfilter that selects
the format.

Stefan

> 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
>
> On Thu, Feb 17, 2011 at 5:07 AM, Thabelo Mmbengeni <thabelo at gmail.com
> <mailto:thabelo at gmail.com>> wrote:
>
>     I agree rtp or srtsp to maintain data streaming.
>
>
>     On Thu, Feb 17, 2011 at 1:00 PM, Luis de Bethencourt
>     <luis at debethencourt.com <mailto:luis at debethencourt.com>> wrote:
>
>         On Thu, Feb 17, 2011 at 8:49 AM, Marc Leeman
>         <marc.leeman at gmail.com <mailto:marc.leeman at gmail.com>> wrote:
>         >> I just started learning gstreamer this morning and I found
>         it might be
>         >> feasible for me to do my project:
>         >
>         > http://lmgtfy.com/?q=stream+file+with+gstreamer
>         >
>         >> For example, the rate of I-frame, B-frame, P-frame, etc.
>         >
>         > http://lmgtfy.com/?q=transcoding+gstreamer
>         >
>         > --
>         >  greetz, marc
>         > There is no likelihood man can ever tap the power of the atom.
>         >                -- Robert Millikan, Nobel Prize in Physics, 1923
>         > crichton 2.6.26 #1 PREEMPT Tue Jul 29 21:17:59 CDT 2008
>         GNU/Linux
>
>
>         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
>         _______________________________________________
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>
>
>
>
>     -- 
>     Regards
>
>     Thabelo Mmbengeni (TMT Services Cape Town HO, Engineering dep)
>
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