[gst-devel] v4l2src & glupload at only 12 FPS?

[Tristan Matthews]

2010/3/5 Julien Isorce <julien.isorce at gmail.com>

> pastbin you glxinfo
>
> and also  run:
>
> GST_DEBUG=gldisplay:3   v4l2src ....
>
> Julien
>
> 2010/3/5 Alexandre Quessy <alexandre at quessy.net>
>
> Hello Julien and the list,
>>
>> Julien Isorce wrote:
>> > Hi,
>> >
>> > And if using gst-launch ? ( v4l2src ! ... ! glupload ! glfilterglass !
>> > glimagesink )
>> >
>>
>> Without the glfilterglass element, it look ok. Here the output with the
>> verbose flag on: http://pastebin.com/MrjEQ5Tc
>>
>> If I add the glfilterglass element, the image is totally black. Here is
>> the output : http://pastebin.com/pzcxfYRz
>>
>>
I've reproduced the bug with dc1394src. It seems to be with glfilterglass,
this line has no problems:
gst-launch -v dc1394src ! ffmpegcolorspace !  glupload ! glfiltercube !
glimagesink
whereas this suffers from the same behaviour that alexandre describes
gst-launch -v dc1394src ! ffmpegcolorspace !  glupload ! glfiltercube !
glimagesink



> Here is the command I have issued. The first time, it was without the
>> glfilterglass element.
>>
>> $ gst-launch -v v4l2src ! video/x-raw-yuv, format=\(fourcc\)I420,
>> framerate=\(fraction\)25/1, width=640, height=480 ! ffmpegcolorspace !
>> glupload  ! glfilterglass ! glimagesink
>>
>> I am not sure about how to read the actual frame rate, though. Any hint?
>>
>> Thanks,
>> Alex
>>
>>
>> > Julien
>> >
>> > 2010/3/3 Alexandre Quessy <alexandre at quessy.net>
>> >
>> >> Hello everyone,
>> >> I have worked on a prototype of a pipeline that uploads a live video
>> >> feed to an OpenGL texture and shares it with a context in SDL,
>> >> starting from the tests/examples/sdlshare.c file in gst-plugins-gl.
>> >> The source code can be found at
>> >> http://bitbucket.org/aalex/toonloop1/src/tip/src/sdlshare.cpp and can
>> >> be compiled with the autotools.
>> >> (./autogen.sh && ./configure && make)
>> >>
>> >> It seems like the mesured framerate is consistently pretty slow. I get
>> >> an average of 12 FPS on a Dual 2.2 GHz with the latest Ubuntu and a
>> >> decent Nvidia graphic card. I obtained 30 FPS on a faster machine with
>> >> a better V4L2-supported video capture card.
>> >>
>> >> Does someone have suggestions on how I could overcome this ? I would
>> >> also prefer to have a framerate that's faster than the capture card's.
>> >> 29.97 FPS is what NTSC gives me, whereas most projectors and monitors
>> >> can do up to 60 FPS. I have tried to set the "sync" property of the
>> >> fakesink element to FALSE, or TRUE, without success. Any other hint ?
>> >>
>> >> --
>> >> Alexandre Quessy
>> >> http://alexandre.quessy.net/
>> >>
>> >>
>> >>
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>
>
>
> ------------------------------------------------------------------------------
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> Try the new software tools for yourself. Speed compiling, find bugs
> proactively, and fine-tune applications for parallel performance.
> See why Intel Parallel Studio got high marks during beta.
> http://p.sf.net/sfu/intel-sw-dev
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>


-- 
Tristan Matthews
email: tristan at sat.qc.ca
web: http://tristanswork.blogspot.com
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