[gst-devel] How to set capture size for a v4lsrc element?

[ye nan]

Hi,
  I can do it in the command line, just run the gst-lunch like this:
  gst-launch-0.10 v4lsrc ! video/x-raw-yuv, width = 320, height = 240 ! 
ffmpegcolorspace !  ximagesink
  But how can I implement this in my own programme?

  I created some elements, including v4lsrc, ffmpegcolorspace, and ximage:
  videosource  = gst_element_factory_make("v4lsrc", "video_source");
  videosink    = gst_element_factory_make("ximagesink", "video_sink");
  videoencconv = gst_element_factory_make("ffmpegcolorspace", 
"video_convert");
  I also create a caps for the v4lsrc, and set format with video/x-raw-yuv, 
width = 320, height = 240:
  caps = gst_caps_new_simple("video/x-raw-yuv", "width", G_TYPE_INT, 320, 
"height", G_TYPE_INT, 240, NULL);
  sinkpad = gst_element_get_pad(videosource  , "sink");
  gst_pad_set_caps(sinkpad, caps);
  But these can make effect on the capture size of v4l streaming like the 
command line, it still a extremely small window, maybe only 80x60. Why?

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