Framerate Negotiation Issue.

[Chuck Crisler]

If you can't get v4l2src to negotiate what you want (I would think that it
should) you can always use vl42 to query the device caps and then select
what you prefer based on a ranked analysis of returned rates/sizes.

On Tue, Mar 26, 2013 at 2:19 PM, Stirling Westrup <swestrup at gmail.com>wrote:

> I've just recently added v4l2src as a video source to my application. I'm
> having trouble with the default pipeline negotiation though. Right now the
> pipeline is negotiating for maximum image size and a correspondingly
> minimum framerate. As a result I end up with images that are 1600x1200 but
> at 5 fps.
>
> I'd prefer to have the negotiation aim for the highest possible framerate
> not over 30 fps, and take whatever reduction in frame size that would
> correspond to that. However, I don't want to hard-code any particular
> framerate as most cameras seem to only support a fixed set of rates, and I
> don't know what rates the attached camera will support.
>
> I had originally hoped to use a capsfilter with a caps like
>
>   framerate=(fraction)[30/1,5/1]
>
> to indicated the range of framerates I'm looking for, with a preference
> for the high end. However neither that nor any other scheme I've tried has
> worked. Am I going to have to write a custom capsfilter element to do what
> I want, or is there some other way that I'm just not seeing?
>
>
> --
> Stirling Westrup
> Programmer, Entrepreneur.
> https://www.linkedin.com/e/fpf/77228
> http://www.linkedin.com/in/swestrup
> http://technaut.livejournal.com
> http://sourceforge.net/users/stirlingwestrup
>
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