change caps for image & imagefreeze

[Stefan Sauer]

On 03/22/2012 10:29 AM, gstream at ccc2.com wrote:
> Hi All,
>
> I have some code that works fine with video streams but when I use a
> pngdec as the source I can not change the caps, gives error of
>
> GStreamer-CRITICAL **: gst_pad_set_caps: assertion `caps == NULL ||
> gst_caps_is_fixed (caps)' failed
> Error: code=3 message=not negotiated
>
> if the caps is set to the png actual input size it passes through with no
> error - ie the actual size is 300x169, in the below code the caps of
> 100x100 triggers the error (pls note this is the java code but I am sure
> you get the drift!)
>
>
> Element source = ElementFactory.make("filesrc", "source");
> Element vparse = ElementFactory.make("pngdec", "vparse");
> Element frz1 = ElementFactory.make("imagefreeze", "frz1");
> Element ffcs1 = ElementFactory.make("ffmpegcolorspace", "ffcs1");
> Element vidsc1 = ElementFactory.make("videoscale", "vidsc1");
> Element capsfilter1 = ElementFactory.make("capsfilter", "filter1");
> capsfilter1.setCaps(Caps.fromString("video/x-raw-yuv, format=(fourcc)AYUV,
> width=100, height=100, framerate=30/1,bpp=16, depth=16 "));
>
> I am also adding this source to a videomixer2 overlay hence the cpas ayuv

How are the element linked? Is it source ! vparse ! frz1 ! ffcs1 !
vidscl ! capsfilter1 ? That should actually work.

Stefan
> any thoughts on how I can change the size?
>
> thx
> Art
>
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