[gst-devel] Re: [patch] gstreamer v4l2 source frame rate detection

[Edgard Lima]

Hi

>Hi Edgard,
>
>  
>
>>Yes, framerate could change, for example if you change the current input
>>(Television, Composite1, S-Video) it may change the norm (PALM, NTSC,
>>...) or else you change the norm by hand.
>>    
>>
>
>Ok, granted, but that is not something the device would do without the
>application requesting it (which is what I meant with "dynamically"). And
>it's easy to fix, too. Just call get_fps to update the v4l2src->fps_x
>variables when the video mode is changed in set_norm. Do you want to write
>this? Like I mentioned, I couldn't test it with a TV card anyway.
>
>  
>

Couldn't a v4l2 devide be opened by two apps at same time? If so, is the 
second app alowed to change the input, or is it read-only?
Another point Im not sure....how does remote control works?

If all of this is granted, of course we could do like you said.


>>>BTW: in the meantime, to use your webcam with v4l2src use
>>>use-fixed-fps=false, I hope it works.
>>>      
>>>
>
>  
>
Could you please try it again, may be it help us to identify another bug.
what pipeline are you using for tests?

>I had tried that, it didn't work but I don't exactly remember why. If you
>need me to reproduce it with the pre-patch version, let me know.
>
>  
>
yes, today I plan to commit a intermediate version with your patch and 
some others things (not everything yet) pointed out by wingo in 
http://bugzilla.gnome.org/show_bug.cgi?id=338818

>Anytime you need some webcam testing (V4L2-capable prefered :-), just let
>me know.
>  
>

Yes, after commit I ll send you a mail - I don't have any v4l2 webcam 
yet :-(

>Different topic: I was wondering why the v4l2src plugin restricts the
>maximum image height to 576 when it queries a device's size limit
>(gst_v4l2src_get_size_limits). Does anyone have an explanation for this? If
>I remove the limit I'm able to source webcam streams at resolutions like
>1280x960 without problems.
>  
>

Hum, I really dont know.
If we have no answer I ll remove this.

BBB, why?

Thanks very much, you are helping us a lot.

BR,
Edgard Lima - alima
edgard.lima at indt.org.br


>Cheers,
>Martin
>
>
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