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 <div style="text-align: left;" id="result_box" dir="ltr">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. </div>thanks <div class="gmail_quote">2009/4/27 Tim-Philipp Müller <<a href="mailto:t.i.m@zen.co.uk">t.i.m@zen.co.uk</a>> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"><div class="im">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 </div>Hrm? Those two pipelines look identical to me. <div class="im"> > 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 </div>> (...) <div class="im">> 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 </div>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 ------------------------------------------------------------------------------ Crystal Reports &#45; New Free Runtime and 30 Day Trial Check out the new simplified licensign option that enables unlimited royalty&#45;free distribution of the report engine for externally facing server and web deployment. <a href="http://p.sf.net/sfu/businessobjects" target="_blank">http://p.sf.net/sfu/businessobjects</a> _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.sourceforge.net">gstreamer-devel@lists.sourceforge.net</a> <a href="https://lists.sourceforge.net/lists/listinfo/gstreamer-devel" target="_blank">https://lists.sourceforge.net/lists/listinfo/gstreamer-devel</a> </blockquote></div>