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

[Tristan Matthews]

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

> What does "is-live" mean exactly ?
>

It's a property inherited from GstBaseSrc. From the documentation:

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.
>

see
http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-libs/html/GstBaseSrc.html#gst-base-src-set-live

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.

-t


>> -tristan
>>
>>
>>
>>> Julien
>>>
>>>
>>>>
>>>>
>>>>
>>>>>
>>>>>
>>>>>>  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/
>>>>>>> >>
>>>>>>> >>
>>>>>>> >>
>>>>>>> ------------------------------------------------------------------------------
>>>>>>> >> Download Intel&#174; Parallel Studio Eval
>>>>>>> >> 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
>>>>>>> >> _______________________________________________
>>>>>>> >> gstreamer-devel mailing list
>>>>>>> >> gstreamer-devel at lists.sourceforge.net
>>>>>>> >> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>>>>>> >>
>>>>>>> >
>>>>>>> >
>>>>>>> >
>>>>>>> ------------------------------------------------------------------------
>>>>>>> >
>>>>>>> >
>>>>>>> ------------------------------------------------------------------------------
>>>>>>> > Download Intel&#174; Parallel Studio Eval
>>>>>>> > 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
>>>>>>> >
>>>>>>> >
>>>>>>> >
>>>>>>> ------------------------------------------------------------------------
>>>>>>> >
>>>>>>> > _______________________________________________
>>>>>>> > gstreamer-devel mailing list
>>>>>>> > gstreamer-devel at lists.sourceforge.net
>>>>>>> > https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>>>>>>
>>>>>>>
>>>>>>> ------------------------------------------------------------------------------
>>>>>>> Download Intel&#174; Parallel Studio Eval
>>>>>>> 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
>>>>>>> _______________________________________________
>>>>>>> gstreamer-devel mailing list
>>>>>>> gstreamer-devel at lists.sourceforge.net
>>>>>>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> ------------------------------------------------------------------------------
>>>>>> Download Intel&#174; Parallel Studio Eval
>>>>>> 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
>>>>>> _______________________________________________
>>>>>> gstreamer-devel mailing list
>>>>>> gstreamer-devel at lists.sourceforge.net
>>>>>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Tristan Matthews
>>>>> email: tristan at sat.qc.ca
>>>>> web: http://tristanswork.blogspot.com
>>>>>
>>>>
>>>>
>>>>
>>>> --
>>>> Tristan Matthews
>>>> email: tristan at sat.qc.ca
>>>> web: http://tristanswork.blogspot.com
>>>>
>>>>
>>>> ------------------------------------------------------------------------------
>>>> Download Intel&#174; Parallel Studio Eval
>>>> 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
>>>> _______________________________________________
>>>> gstreamer-devel mailing list
>>>> gstreamer-devel at lists.sourceforge.net
>>>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>>>
>>>>
>>>
>>>
>>> ------------------------------------------------------------------------------
>>> Download Intel&#174; Parallel Studio Eval
>>> 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
>>> _______________________________________________
>>> gstreamer-devel mailing list
>>> gstreamer-devel at lists.sourceforge.net
>>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>>
>>>
>>
>>
>> --
>> Tristan Matthews
>> email: tristan at sat.qc.ca
>> web: http://tristanswork.blogspot.com
>>
>>
>> ------------------------------------------------------------------------------
>> Download Intel&#174; Parallel Studio Eval
>> 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
>> _______________________________________________
>> gstreamer-devel mailing list
>> gstreamer-devel at lists.sourceforge.net
>> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>
>>
>
>
> ------------------------------------------------------------------------------
> Download Intel&#174; Parallel Studio Eval
> 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
> _______________________________________________
> gstreamer-devel mailing list
> gstreamer-devel at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>
>


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