<div class="gmail_quote">On Sat, Nov 6, 2010 at 9:23 AM, HaroldJRoth <<a href="mailto:dlafferty@gmail.com">dlafferty@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> This is a really simple question that for some reason I can't find an answer to in the docs. This probably means I'm going about it all wrong, but here goes: I want to convert the following pipeline spec into 'C' code: gst-launch filesrc location=videotestsrc.ogg ! decodebin2 ! videoscale ! video/x-raw-yuv, width=50 ! queue ! appsrc E.g. I want to scale the video output coming from decodebin2 to a width and format, then I want to pass it through a queue to my appsrc element. And I want to do it with the 'C' API. So, I'm thinking the bit in the middle needs to be something like: GstElement mVideoScaler = gst_element_factory_make("videoscale", "videoscaler"); GstElement mDecoderOutput = gst_element_factory_make("decodebin2", "decoder"); GstElement mVideoQueue = gst_element_factory_make("queue", "videoqueue"); GstCaps* videoCaps = gst_caps_new_simple ("video/x-raw-yuv", "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'), "width", G_TYPE_INT, 50, NULL); gst_bin_add_many(GST_BIN(mGstPipeline), mDecoderOutput, mVideoScaler, mVideoQueue, NULL); gst_element_link_filtered (mDecoderOutput, mVideoScaler, videoCaps) gst_element_link_filtered (mVideoScaler, mVideoQueue) Does this seem sensible? </blockquote><div> The caps on the middle of your gst-launch line is syntactic sugar. In the pipeline it is converted to a 'capsfilter' element with the 'caps' property set to the caps you provide. Try creating a capsfilter and setting its property with g_object_set. </div><blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;"> -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Simple-Q-How-to-set-Caps-programmatically-when-assembly-a-pipeline-in-C-tp3029913p3029913.html" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Simple-Q-How-to-set-Caps-programmatically-when-assembly-a-pipeline-in-C-tp3029913p3029913.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. ------------------------------------------------------------------------------ The Next 800 Companies to Lead America's Growth: New Video Whitepaper David G. Thomson, author of the best-selling book "Blueprint to a Billion" shares his insights and actions to help propel your business during the next growth cycle. Listen Now! <a href="http://p.sf.net/sfu/SAP-dev2dev" target="_blank">http://p.sf.net/sfu/SAP-dev2dev</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> -- Thiago Sousa Santos