<div dir="ltr"><div>Your caps might have different format so it cannot negotiate properly. </div><div>According to source codes of openh264, it accepts only I420 format as an input, but you used RGB here. </div></div><div class="gmail_extra"> <div class="gmail_quote">On Sun, Aug 30, 2015 at 6:01 AM, dtmoodie <<a href="mailto:dtmoodie@gmail.com" target="_blank">dtmoodie@gmail.com</a>> wrote: <blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I'm trying to stream images from opencv to a gstreamer pipeline. My caps are as follows: GstCaps* caps = gst_caps_new_simple("video/x-raw", "format", G_TYPE_STRING, "RGB24", "width", G_TYPE_INT, imgSize.width, "height", G_TYPE_INT, imgSize.height, "framerate", GST_TYPE_FRACTION, 15, 1, "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1, NULL); I've also tried with format = RGB. red_mask = 0x00ff0000 blue_mask = 0x000000ff green_mask = 0x0000ff00 endianness Some examples I'm going off of: <a href="http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-caps-api.html" rel="noreferrer" target="_blank">http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/section-caps-api.html</a> <a href="http://www.imgportal.net/home/wp-content/uploads/maris-script1.cpp" rel="noreferrer" target="_blank">http://www.imgportal.net/home/wp-content/uploads/maris-script1.cpp</a> My desired pipeline: appsrc name=mysource ! openh264enc ! rtph264pay config-interval=1 pt=96 ! udpsink host=127.0.0.1 port=8004 Pushing data onto the appsrc: cv::Mat frameimage(user_data->imgSize, CV_8UC3); static GstClockTime timestamp = 0; GstBuffer *buffer; guint buffersize; GstFlowReturn ret; GstMapInfo info; buffersize = frameimage.cols * frameimage.rows * frameimage.channels(); buffer = gst_buffer_new_and_alloc(buffersize); if (gst_buffer_map(buffer, &info, (GstMapFlags)GST_MAP_WRITE)) { memcpy(info.data, frameimage.data, buffersize); gst_buffer_unmap(buffer, &info); } else { BOOST_LOG_TRIVIAL(error) << "Unable to map image data to buffer"; } ret = gst_app_src_push_buffer((GstAppSrc*)user_data->source_OpenCV, buffer); if (ret != GST_FLOW_OK) { BOOST_LOG_TRIVIAL(error) << "something wrong in cb_need_data"; g_main_loop_quit(user_data->glib_MainLoop); } Full source can be found here: <a href="https://github.com/dtmoodie/EagleEye/blob/Dev/Plugins/GStreamer/src/gstreamer.cpp" rel="noreferrer" target="_blank">https://github.com/dtmoodie/EagleEye/blob/Dev/Plugins/GStreamer/src/gstreamer.cpp</a> -- View this message in context: <a href="http://gstreamer-devel.966125.n4.nabble.com/Appsrc-internal-dataflow-error-tp4673397.html" rel="noreferrer" target="_blank">http://gstreamer-devel.966125.n4.nabble.com/Appsrc-internal-dataflow-error-tp4673397.html</a> Sent from the GStreamer-devel mailing list archive at Nabble.com. _______________________________________________ gstreamer-devel mailing list <a href="mailto:gstreamer-devel@lists.freedesktop.org">gstreamer-devel@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel" rel="noreferrer" target="_blank">http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel</a> </blockquote></div> </div>