[gst-devel] Re : Re : Grabbing analog video source with gstreamer

Wesley J. Miller WMiller at sdr.com
Thu Apr 8 15:37:14 CEST 2010 

Hi again,
I've moved a bit forward, but not enought yet to achieve grabbing with gstreamer. First thing I did was to check I could acquire from WinMovieMaker, and that worked. I even successed with virtualdub.

ok but still does not work with graphedit ? if yes this is really strange. You have to figure out what is going on because dshowvideosrc builds a directshow graph as graphedit does.

Then I noticed was that my grabber source was emiting in YUY2 format. When I gst-inspected my dshowvideosrc I realized it was not a supported format (was version 0.10.10), which explained the 'could not link elements' message I had with a simple dshowvideosrc ! fakesink pipeline.
I have installed latest winbuilds version (now 0.10.4-prerelease). This one handles YUY2. But now I get a new error "gstdshowvideosrc.c:653:gst_dshowvideosrc_change_state: Can't RUN the directshow capture graph (error=-2147023729)"

I think this is the same error as you got in graphedit ("device not connected")

I have tried to check on the web possible problems, but found nothing relevant. Only thing was to check directx version, and I have 9.0c.
It feels frustrating to see all components but gstreamer able to acquire my video...

You could report the graphedit problem to the device company. They often uses it.
If you resolve the graphedit pb then dshowvideosrc will work. That's all I can do without having the device in my hands.

Regards,
Al

________________________________
De : Julien Isorce <julien.isorce at gmail.com<mailto:julien.isorce at gmail.com>>
À : Discussion of the development of GStreamer <gstreamer-devel at lists.sourceforge.net<mailto:gstreamer-devel at lists.sourceforge.net>>
Envoyé le : Jeudi, 16 Juillet 2009, 15h32mn 55s
Objet : Re: [gst-devel] Re : Re : Re : Grabbing analog video source with gstreamer


2009/7/16 Albert Costa <costa_albert at yahoo.fr<mailto:costa_albert at yahoo.fr>>

In graphedit, the property page for the element shows video decoder options (mainly PAL and SECAM formats). The output pin also reports the decoder options, plus the image format.

And if I connect a video renderer and try to play, it says no peripheral is connected.

 So it's not a GStreamer problem.
There is a software provided with the hardware, I tested it at home it did allow the grabbing. But I don't know if there's a way to use the hw without the sw...

>From my experience, if you can see the hw in graphedit then you can use it without the sw. If not, you can't.

Try to grab using  "Window Movie Maker" that is installed by default on winxp
(select "capture from video device")

Regards,
Al

Julien


________________________________
De : Julien Isorce <julien.isorce at gmail.com<mailto:julien.isorce at gmail.com>>
À : Gstreamer <gstreamer-devel at lists.sourceforge.net<mailto:gstreamer-devel at lists.sourceforge.net>>
Envoyé le : Jeudi, 9 Juillet 2009, 17h12mn 45s
Objet : Re: [gst-devel] Re : Re : Grabbing analog video source with gstreamer

(reply to the gst list)

Note that you should have the same error doing:

set GST_DEBUG=1
gst-launch dshowvideosrc ! fakesink

About the reason of the error, you should have this error only if you disconnect the usb link.

-->Anything with right bouton on the capture filter in graphedit, to open the property page ?
-->property page on the ouput pin ?
-->Is there a software joined to the device ? does it work ?

Julien
2009/7/9 Albert Costa <costa_albert at yahoo.fr<mailto:costa_albert at yahoo.fr>>
Hi,
ok it does appear in the list. I wanted to add a renderer and see if it plays, but...
Problem is then that it does not see that I have a source physically connected to it. I guess that's also why gstreamer plugin does not recognize it.
See attached pict.
Al

________________________________
De : Julien Isorce <julien.isorce at gmail.com<mailto:julien.isorce at gmail.com>>
À : Discussion of the development of GStreamer <gstreamer-devel at lists.sourceforge.net<mailto:gstreamer-devel at lists.sourceforge.net>>
Envoyé le : Jeudi, 9 Juillet 2009, 14h51mn 42s
Objet : Re: [gst-devel] Re : Grabbing analog video source with gstreamer

dshowvideosrc handles a capture device only if the device driver implements the directshow capture interfaces.
To check if you driver associated with your "SvideoToUsb device", implements those interfaces or not,
you can use "graphedit" (you can find it on the web).
Then if you see your device in "Video Capture Device" category, then it should be ok.

Julien
2009/7/9 Albert Costa <costa_albert at yahoo.fr<mailto:costa_albert at yahoo.fr>>
Hi,
thanks for the tips. I actually already use the winbuilds binaries, so I got this one (though I'm on winbuild version 0.10.2, not 0.10.3).
However, I cannot see my grabber input with it. It works fine with a simple usb webcam, but looks like the Svideo to USB grabber is not handled the same way, pitty...
Regards,
Al

________________________________
De : Julien Isorce <julien.isorce at gmail.com<mailto:julien.isorce at gmail.com>>
À : Discussion of the development of GStreamer <gstreamer-devel at lists.sourceforge.net<mailto:gstreamer-devel at lists.sourceforge.net>>
Envoyé le : Jeudi, 9 Juillet 2009, 11h53mn 54s
Objet : Re: [gst-devel] Grabbing analog video source with gstreamer

Hi,

You can try dshowvideosrc from there:

http://www.gstreamer-winbuild.ylatuya.es/doku.php?id=download

which is different from the one who is in gst-plugins-bad

see http://bugzilla.gnome.org/show_bug.cgi?id=517203 for more informations.

Julien
2009/7/8 Philip Jägenstedt <philip at foolip.org<mailto:philip at foolip.org>>
I've done capture with GStreamer using v4l2src, but if you're on XP
have a look at http://asabil.wordpress.com/2007/05/20/directshowvideosrc-for-gstreamer/
Apparently it's dshowsrcwrapper in gst-plugins-bad.

Philip

On Wed, Jul 8, 2009 at 14:41, Albert Costa<costa_albert at yahoo.fr<mailto:costa_albert at yahoo.fr>> wrote:
> Hi,
> I would like to know if anyone has already used GStreamer to get video from
> an analog source? For some reasons, I may have to use a S-Video camera for a
> project. So I'll need to get the video from it. Has anyone experienced using
> gst with a frame grabber ? (btw, I'm under winXP)
> I've tried a S-Video to USB converter, but I cannot see which plugin I could
> use : ksvideosrc does not see it.
> Any help or advice would be welcomed,
> Regards,
> Al
>
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--
Philip Jägenstedt

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