[gst-devel] getting data format info

[thiagoss]

On Mon, Sep 1, 2008 at 11:56 AM, Hendrik Schober <spamtrap at gmx.de> wrote:

> thiagoss wrote:
> >
> > On Mon, Sep 1, 2008 at 11:18 AM, Hendrik Schober <spamtrap at gmx.de
> > <mailto:spamtrap at gmx.de>> wrote:
> >
> >     Hi,
> >
> >     we are using (or is that abusing?) gstreamer in order to capture
> >     video data from an USB camera. For this we have setup a v4lsrc
> >     and a fake sink and grab the data in the handoff hook of the
> >     latter. So far, so good. However, despite several hours of
> >     tinkering we haven't found out how to determine what format
> >     (width, height, encoding) the data comes in.
> >     What do we need to do to get these values?
> >
> >
> > Check the 'caps' in the source pad of the v4lsrc element.
>
>  Thanks for your answer.
>  In fact, we already did that -- and got back a rather long
>  list of caps. But that doesn't tell us which one's currently
>  used. (Also, they specify a range for width and height, while
>  we need the ones that actually are negotiated.)
>

You should check the caps in the buffers you get from the handoff buffers
instead.

>
>  Schobi
>
>
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-- 
Thiago Sousa Santos

Embedded Systems and Pervasive Computing Lab (Embedded)
Center of Electrical Engineering and Informatics (CEEI)
Federal University of Campina Grande (UFCG)
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