[gst-devel] How to change colorspace on the fly

[AlannY]

Thijs Vermeir wrote:
 > Hi,
 >
 > You can use ffmpegcolorspace like this:
 > gst-launch -v videotestsrc ! ffmpegcolorspace ! video/x-raw-rgb ! 
fakesink
 >
 > But you don't need ffmpegcolorspace because the videotestsrc can
 > also output video in rgb. (Try gst-inspect videotestsrc)
 >
 > To force videotestsrc to use rgb use something like this:
 > gst-launch -v videotestsrc ! video/x-raw-rgb ! fakesink
 >
 > Gr,
 > Thijs
 >

And how to do it programmaly? I'm trying, but everything I get 
video/x-raw-yuv ;-(

(example)
source = gst_element_factory_make("videotestsrc", "source");
colorspace = gst_element_factory_make("ffmpegcolorspace", "colorspace");
myplugin = gst_element_factory_make("myplugin", "myplugin");
video_sink = gst_element_factory_make("xvimagesink", "video_sink");

gst_bin_add_many(GST_BIN(pipeline), source, colorspace, libass, 
video_sink, NULL);

caps = gst_caps_new_simple("video/x-raw-rgb", NULL);
gst_element_link_filtered(source, colorspace, caps);
gst_caps_unref(caps);

gst_element_link(colorspace, myplugin);
gst_element_link(mypluin, video_sink);

Nothing works. Myplugin still receives video/x-raw-yuv