Hello! I'm doing my first steps with GStreamer :) I'd like to draw lines in a RGB space before show it. I let you a simple c++ program that shows a webcam. I've add a callback to get the buffer after convert it, but it's in YUY2 and not in RGB. What am I doing wrong? Notes: width x height x bits_per_pixel / 8 = buffer size (in bytes) YUY2: 640x480x16/8 = 614400 RGB: 640x480x24/8 = 921600 Program output "ch_havedata: buffer size 614400" :( Thanks, Juan Pablo [code] // Compile: g++ -Wall `pkg-config --cflags --libs gstreamer-0.10` pipeline03.cpp -o pipeline03 #include <gst/gst.h> static GMainLoop *loop; static gboolean cb_have_data(GstPad *pad, GstBuffer *buffer, gpointer u_data) { g_print("ch_havedata: buffer size %d\n",GST_BUFFER_SIZE(buffer)); return TRUE; } gint main (gint argc, gchar *argv[]) { GstElement *pipeline, *webcamsrc, *flt, *colorspace, *videosink; GstPad *pad; // init GStreamer gst_init (&argc, &argv); // create pipeline pipeline = gst_pipeline_new ("pipeline"); // configure pipeline webcamsrc = gst_element_factory_make ("v4l2src", "webcamsrc"); flt = gst_element_factory_make ("capsfilter", "flt"); colorspace = gst_element_factory_make ("ffmpegcolorspace", "colorspace"); videosink = gst_element_factory_make ("xvimagesink", "videosink"); // setup capsfilter g_object_set (G_OBJECT (flt), "caps", gst_caps_new_simple ("video/x-raw-yuv", "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('Y', 'U', 'Y', '2'), "width", G_TYPE_INT, 640, "height", G_TYPE_INT, 480, "framerate", GST_TYPE_FRACTION, 20, 1, "bpp", G_TYPE_INT, 16, "depth", G_TYPE_INT, 16, "endianness", G_TYPE_INT, G_BYTE_ORDER, NULL), NULL); // add two callback pad = gst_element_get_pad(videosink, "sink"); gst_pad_add_buffer_probe (pad, G_CALLBACK (cb_have_data), NULL); gst_object_unref (pad); // link gst_bin_add_many (GST_BIN (pipeline), webcamsrc, flt, colorspace, videosink, NULL); gst_element_link_many (webcamsrc, flt, videosink, NULL); // play pipeline gst_element_set_state (pipeline, GST_STATE_PLAYING); // create mainloop loop = g_main_loop_new (NULL, FALSE); g_main_loop_run (loop); // clean up gst_element_set_state (pipeline, GST_STATE_NULL); gst_object_unref (pipeline); g_main_loop_unref (loop); return 0; }