<div class="gmail_quote">2010/3/5 Julien Isorce <span dir="ltr"><<a href="mailto:julien.isorce@gmail.com">julien.isorce@gmail.com</a>></span><br><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="gmail_quote"><div></div><div>What does "is-live" mean exactly ?<br></div></div></blockquote><div><br>It's a property inherited from GstBaseSrc. From the documentation:<br><br><blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote">
A live source will not produce data in the PAUSED state and
will therefore not be able to participate in the PREROLL phase
of a pipeline. To signal this fact to the application and the
pipeline, the state change return value of the live source will
be GST_STATE_CHANGE_NO_PREROLL.<br></blockquote><br>see <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html#gst-base-src-set-live">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html#gst-base-src-set-live</a><br>
<br>It's useful here because it makes the videotestsrc behave like a live source (like v4l2src and dc1394src), and thus i can recreate the same bug with it (the black window when used with glfilterglass). It's worth noting that the glfiltersobel plugin does work fine with live sources, so I don't think the problem with glfilterglass is specifically because it uses shaders.<br>
<br>-t<br><br></div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="gmail_quote"><div></div><div><div></div><div class="h5"><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="gmail_quote"><div><font color="#888888">
<br>-tristan<br><br> </font></div><div><div></div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="gmail_quote">
<div><font color="#888888">Julien<br> </font></div>
<div><div></div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="gmail_quote"><div><br> </div><div><div></div>
<div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="gmail_quote">
<div> </div><div><div></div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
<div class="gmail_quote"><div><div><blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">
Here is the command I have issued. The first time, it was without the<br>
glfilterglass element.<br>
<br>
$ gst-launch -v v4l2src ! video/x-raw-yuv, format=\(fourcc\)I420,<br>
framerate=\(fraction\)25/1, width=640, height=480 ! ffmpegcolorspace !<br>
glupload ! glfilterglass ! glimagesink<br>
<br>
I am not sure about how to read the actual frame rate, though. Any hint?<br>
<br>
Thanks,<br>
Alex<br>
<div><div></div><div><br>
<br>
> Julien<br>
><br>
> 2010/3/3 Alexandre Quessy <<a href="mailto:alexandre@quessy.net" target="_blank">alexandre@quessy.net</a>><br>
><br>
>> Hello everyone,<br>
>> I have worked on a prototype of a pipeline that uploads a live video<br>
>> feed to an OpenGL texture and shares it with a context in SDL,<br>
>> starting from the tests/examples/sdlshare.c file in gst-plugins-gl.<br>
>> The source code can be found at<br>
>> <a href="http://bitbucket.org/aalex/toonloop1/src/tip/src/sdlshare.cpp" target="_blank">http://bitbucket.org/aalex/toonloop1/src/tip/src/sdlshare.cpp</a> and can<br>
>> be compiled with the autotools.<br>
>> (./autogen.sh && ./configure && make)<br>
>><br>
>> It seems like the mesured framerate is consistently pretty slow. I get<br>
>> an average of 12 FPS on a Dual 2.2 GHz with the latest Ubuntu and a<br>
>> decent Nvidia graphic card. I obtained 30 FPS on a faster machine with<br>
>> a better V4L2-supported video capture card.<br>
>><br>
>> Does someone have suggestions on how I could overcome this ? I would<br>
>> also prefer to have a framerate that's faster than the capture card's.<br>
>> 29.97 FPS is what NTSC gives me, whereas most projectors and monitors<br>
>> can do up to 60 FPS. I have tried to set the "sync" property of the<br>
>> fakesink element to FALSE, or TRUE, without success. Any other hint ?<br>
>><br>
>> --<br>
>> Alexandre Quessy<br>
>> <a href="http://alexandre.quessy.net/" target="_blank">http://alexandre.quessy.net/</a><br>
>><br>
>><br>
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><br>
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<br></blockquote></div></div></div><font color="#888888"><br><br clear="all"><br>-- <br>Tristan Matthews<br>email: <a href="mailto:tristan@sat.qc.ca" target="_blank">tristan@sat.qc.ca</a><br>web: <a href="http://tristanswork.blogspot.com" target="_blank">http://tristanswork.blogspot.com</a><br>
</font></blockquote></div></div></div><div><div></div><div><br><br clear="all"><br>-- <br>Tristan Matthews<br>email: <a href="mailto:tristan@sat.qc.ca" target="_blank">tristan@sat.qc.ca</a><br>web: <a href="http://tristanswork.blogspot.com" target="_blank">http://tristanswork.blogspot.com</a><br>
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