Gst_caps_new_simple fails

[Luca Bacci]

Hi, I'm using GStreamer to decode video files and get a sequence of RGB
frames that I paint in a widget of my application. This is the pipeline:

filesrc ! decodebin ! videoconvert ! appsink

I want RGB frames and for that I use the "caps" property of appsink but

GstCaps *caps = gst_caps_new_simple("video/x-raw",
                    "format", G_TYPE_STRING, "xRGB",
                    NULL);

fails and returns NULL caps, why?

Thanks in advance,
Luca
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