feed gstreamer with glc

[Paolo Bolzoni-2]

Dear gstreamer list,

I am trying to feed gstreamer with the output of glc*. But I cannot
get it to work, here is my experiments.

Open three shells and execute this commands, you should see that
mplayer works.

first shell, mplayer reads the stream.
$ mkfifo mux
$ mkfifo video
$ mplayer -identify video

second shell, glc converts from its internal format.
$ glc-play mux -t -y 1 -o video

third shell, glc starts the application and starts the screencast.
$ glc-capture --disable-audio -s -o mux glxgears

In my system mplayer gave some useful information about what
gstreamer pipeline I might need:

[lavf] stream 0: video (rawvideo), -vid 0
VIDEO:  [I420]  300x300  0bpp  30.000 fps    0.0 kbps ( 0.0 kbyte/s)
ID_VIDEO_FORMAT=I420
ID_VIDEO_WIDTH=300
ID_VIDEO_HEIGHT=300

So instead of mplayer in the first shell I try to execute:
$ gst-launch-1.0 -tev filesrc location=video \
    ! videoparse height=300 width=300 framerate=30 \
    ! autovideosink

The output is wrong, the gears appear distorted and
after a while the gears stop altogether. Maybe there is some
payload?

So my question is, how is possible to feed gstreamer with glc video?

Thanks,
Paolo


* https://github.com/nullkey/glc
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[Edward Hervey]

Hi,

  glc seems to output y4m streams (and not just raw video). Replace
videoparse with y4mdec and it should do the trick.

   Edward

On Mon, 2012-11-26 at 21:49 +0100, Paolo Bolzoni wrote:

> Dear gstreamer list,
>
> I am trying to feed gstreamer with the output of glc*. But I cannot
> get it to work, here is my experiments.
>
> Open three shells and execute this commands, you should see that
> mplayer works.
>
> first shell, mplayer reads the stream.
> $ mkfifo mux
> $ mkfifo video
> $ mplayer -identify video
>
> second shell, glc converts from its internal format.
> $ glc-play mux -t -y 1 -o video
>
> third shell, glc starts the application and starts the screencast.
> $ glc-capture --disable-audio -s -o mux glxgears
>
> In my system mplayer gave some useful information about what
> gstreamer pipeline I might need:
>
> [lavf] stream 0: video (rawvideo), -vid 0
> VIDEO:  [I420]  300x300  0bpp  30.000 fps    0.0 kbps ( 0.0 kbyte/s)
> ID_VIDEO_FORMAT=I420
> ID_VIDEO_WIDTH=300
> ID_VIDEO_HEIGHT=300
>
> So instead of mplayer in the first shell I try to execute:
> $ gst-launch-1.0 -tev filesrc location=video \
>     ! videoparse height=300 width=300 framerate=30 \
>     ! autovideosink
>
> The output is wrong, the gears appear distorted and
> after a while the gears stop altogether. Maybe there is some
> payload?
>
> So my question is, how is possible to feed gstreamer with glc video?
>
> Thanks,
> Paolo
>
>
> * https://github.com/nullkey/glc
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel

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[Paolo Bolzoni-2]

I am afraid that it was my first try...
Here is what happen if I use y4mdec:

----------------------------- >8
% gst-launch-1.0 -tev filesrc location=video \
    ! y4mdec \
    ! autovideosink
Setting pipeline to PAUSED ...
Pipeline is PREROLLING ...
/GstPipeline:pipeline0/GstY4mDec:y4mdec0.GstPad:src: caps =
video/x-raw, format=(string)I420, width=(int)300, height=(int)300,
pixel-aspect-ratio=(fraction)1/1, interlace-mode=(string)progressive,
colorimetry=(string)bt601, framerate=(fraction)30/1
/GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0.GstGhostPad:sink.GstProxyPad:proxypad0:
caps = video/x-raw, format=(string)I420, width=(int)300,
height=(int)300, pixel-aspect-ratio=(fraction)1/1,
interlace-mode=(string)progressive, colorimetry=(string)bt601,
framerate=(fraction)30/1
/GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0/GstXvImageSink:autovideosink0-actual-sink-xvimage.GstPad:sink:
caps = video/x-raw, format=(string)I420, width=(int)300,
height=(int)300, pixel-aspect-ratio=(fraction)1/1,
interlace-mode=(string)progressive, colorimetry=(string)bt601,
framerate=(fraction)30/1
/GstPipeline:pipeline0/GstAutoVideoSink:autovideosink0.GstGhostPad:sink:
caps = video/x-raw, format=(string)I420, width=(int)300,
height=(int)300, pixel-aspect-ratio=(fraction)1/1,
interlace-mode=(string)progressive, colorimetry=(string)bt601,
framerate=(fraction)30/1
ERROR: from element /GstPipeline:pipeline0/GstY4mDec:y4mdec0: Failed
to parse YUV4MPEG frame
Additional debug info:
gsty4mdec.c(517): gst_y4m_dec_chain (): /GstPipeline:pipeline0/GstY4mDec:y4mdec0
ERROR: pipeline doesn't want to preroll.
Setting pipeline to NULL ...
Freeing pipeline ...
8< -----------------------------
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[Paolo Bolzoni-2]

It works with y4mparse*, but Gentrans is still at version 0.10.3 in my
distro. I tried to compile
it manually, but I get this error:

 WARNING **: Can't find avdemux_yuv4mpegpipe element, y4mparse will not work

I can just use gstreamer 0.10... but I would like to use the newer one.

Paolo

* http://gentrans.sourceforge.net/docs/head/gst-entrans-plugins/html/gst-entrans-plugins-y4mparse.html
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