[gst-devel] allowed caps and v4l2src

[marc doz]

Hi,
Sorry,
2) with a v4l2src element, I can do that :
 v4l2src ! video/x-raw-yuv ! ffmpegcolorspace ! ximagesink
3) but i can't do that :
v4l2src ! video/x-raw-rgb ! ffmpegcolorspace ! ximagesink

I will test your command after my job

for now, I made the requests gst_pad_get_caps() or the request
gst_pad_get_allowed_caps() on the sources's src pad
before the device is in PLAYING state.
With the result of the query , I select my caps with a filterCaps.

thanks

2009/4/27 Tim-Philipp Müller <t.i.m at zen.co.uk>

> On Sun, 2009-04-26 at 22:55 +0200, marc doz wrote:
>
> > 2) with a v4l2src element, I can do that :
> > v4l2src ! video/x-raw-rgb ! ffmpegcolorspace ! ximagesink
> > 3) but i can't do that :
> > v4l2src ! video/x-raw-rgb ! ffmpegcolorspace ! ximagesink
>
> Hrm? Those two pipelines look identical to me.
>
>
> > 4) So I have built a tiny program that i use to print allowed caps of
> > the pad between v4l2src and ffmpegcolorspace
> > ./main v4l2src src ffmpegcolorspace sink
> >   (...)
> > my pad can use x-raw-rgb (and I would like use video/x-raw-rgb, bpp: 8)
> but i can't use rgb format ... with gst-launch
>
> The 'allowed' caps / template caps are the caps that the element(s)
> might support in theory. The caps actually supported in practice are
> likely to be a small subset of these. Something like:
>
> GST_DEBUG=v4l2src:5 gst-launch-0.10 v4l2src num-buffers=1 ! fakesink
> 2>&1 | grep probed
>
> should show you what is actually support by your camera/drivers. You can
> query this programmatically by doing a gst_pad_get_caps() on the
> sources's src pad once the device is open (which is in PLAYING state I
> think - but it might be earlier, I can never remember).
>
> Cheers
>  -Tim
>
>
>
>
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