how to determine fps of a camera pipeline

[Zhao, Halley]

Hi:

My camera doesn’t provide sets of fps, but could be queried to get frames of data.

So I think it is not a push source, then I add a capsfilter after it to set frame_rate.

gst-launch -v mycamsrc num-buffers=200 ! video/x-raw-yuv, framerate=10 ! tee name=t ! queue ! xvimagesink t. ! theoraenc ! oggmux ! filesink location=test.ogg

Is it the correct way?

 

However, I found the real fps doesn’t match to 10 exactly.

Then I want to add a videorate after capsfilter to smooth it.

Correct?

 

Thanks.

 

 

 

 

 

ZHAO, Halley (Aihua)

Email: halley.zhao<a href="BLOCKED::mailto:[e-mail]" title="mailto:[e-mail]&#10;mailto:[e-mail]">@intel.com

Tel: [phone]

iNet: 8821-6476

SSG/OTC/Moblin 3W038 Pole: F4

 

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[Stefan Sauer]

Zhao, Halley schrieb:

>
> Hi:
>
> My camera doesn’t provide sets of fps, but could be queried to get
> frames of data.
>
> So I think it is not a push source, then I add a capsfilter after it
> to set frame_rate.
>
> gst-launch -v mycamsrc num-buffers=200 ! video/x-raw-yuv, framerate=10
> ! tee name=t ! queue ! xvimagesink t. ! theoraenc ! oggmux ! filesink
> location=test.ogg
>

gst-launch -v mycamsrc num-buffers=200 ! "video/x-raw-yuv,
framerate=(fraction)10/1" ! tee ...
Ideally you would run the thread from mycamsrc under SCHED_RR to ensure
that you timestamp buffers when they are read and not when the thread
eventually gets scheduled.

Stefan

> Is it the correct way?
>
>  
>
> However, I found the real fps doesn’t match to 10 exactly.
>
> Then I want to add a videorate after capsfilter to smooth it.
>
> Correct?
>
>  
>
> Thanks.
>
>  
>
>  
>
>  
>
>  
>
>  
>
> *ZHAO, Halley (Aihua)*
>
> Email: [hidden email] <BLOCKED::mailto:[hidden email]>
>
> Tel: [phone]
>
> iNet: 8821-6476
>
> SSG/OTC/Moblin 3W038 Pole: F4
>
>  
>
> ------------------------------------------------------------------------
>
> ------------------------------------------------------------------------------
> Come build with us! The BlackBerry(R) Developer Conference in SF, CA
> is the only developer event you need to attend this year. Jumpstart your
> developing skills, take BlackBerry mobile applications to market and stay
> ahead of the curve. Join us from November 9 - 12, 2009. Register now!
> http://p.sf.net/sfu/devconference
> ------------------------------------------------------------------------
>
> _______________________________________________
> gstreamer-devel mailing list
> [hidden email]
> https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>  

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[Florent THIERY-2]

Indeed, advised/requested fps might not always be the real one. For
measuring it, i use a trick: i place a videorate with arbitrary caps
after the source, and measure the dropped/duplicated frames to
determine the real framerate. You can see and exemple at [1].

I recall there was a developer plugin on it's way used to
display/measure the real framerate, but i don't remember.

Florent

[1] http://code.google.com/p/gst-plugins-elphel/source/browse/trunk/tests/test_elphel_perf.py

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