<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta content="text/html;charset=ISO-8859-1" http-equiv="Content-Type"> </head> <body bgcolor="#ffffff" text="#000000"> mpeg2dec element also has no dynamic pads: gst-inspect mpeg2dec ... Pad Templates:   SRC template: 'src'     Availability: Always     Capabilities:       video/x-raw-yuv                  format: { YV12, I420, Y42B }                   width: [ 16, 4096 ]                  height: [ 16, 4096 ]               framerate: [ 0/1, 2147483647/1 ] ... Also it is make sense to have queues between demux and decoders for both video and audio. alavariega wrote: <blockquote cite="mid:23197413.post@talk.nabble.com" type="cite"> <pre wrap="">The "mad" element doesn't have dynamic pads, so it doesn't emit a "pad-added" signal. You can connect it directly to "audioconvert". Also I see that you declare "queueV" as a "GstElement**" and not as a "GstElement*". Hi Sledge, thanks for your reply! I have already made the corresponding changes and still not activated the signal that link the video decoder with the respective queue. when i execute the application this is the result: ** (testvideop:6043): DEBUG: Signal: pad-added on_pad_added: audio/mpeg ** (testvideop:6043): DEBUG: Linking audio pad to decodera The audio pad src was linked ** (testvideop:6043): DEBUG: Signal: pad-added on_pad_added: video/mpeg ** (testvideop:6043): DEBUG: Linking video pad to decoderv The video pad src was linked There are no more errors, but they are not playing the video and audio streams simultaneously Thanks in advance for the help, Best Regards, Alberto. #include<gst/gst.h> static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data); static void on_pad_added (GstElement *element, GstPad *pad); static void on_decpad_added(GstElement *element, GstPad *pad ); GstElement *pipeline, *src, *demux, *decoderv, *sinkv, *decodera, *convert, *resample, *sinka; GstElement *queueA, *queueV; int main(int argc, char *argv[]) { GstStateChangeReturn ret; GMainLoop *loop; GstBus *bus; /*initialization*/ gst_init(&argc,&argv); loop = g_main_loop_new(NULL, FALSE); if(argc != 2) { g_print("Usage: %s <mpg/mpeg video file>", argv[0]); return -1; } pipeline = gst_pipeline_new("VIDEO PLAYER"); bus = gst_pipeline_get_bus(GST_PIPELINE(pipeline)); gst_bus_add_watch(bus, bus_call, loop); src = gst_element_factory_make("filesrc", "filesource"); demux = gst_element_factory_make("dvddemux", "mpg-demux"); /*Gstreamer video elements*/ decoderv = gst_element_factory_make("mpeg2dec", "mpeg-decoder"); sinkv = gst_element_factory_make("xvimagesink", "video-out"); if(!decoderv || !sinkv) { g_print("\nthe video could not playback\n"); return -1; } /*Gstreamer audio elements*/ decodera = gst_element_factory_make("mad", "decoder-audio"); convert = gst_element_factory_make("audioconvert", "a-convert"); resample = gst_element_factory_make("audioresample", "a-resample"); sinka = gst_element_factory_make("osssink", "play audio"); if(!decodera || !convert || !resample || !sinka) { g_print("\nthe audio could not playback\n"); return -1; } queueA = gst_element_factory_make("queue", "queue-audio"); queueV = gst_element_factory_make("queue", "queue-video"); g_object_set (G_OBJECT (src), "location", argv[1], NULL); gst_bin_add_many(GST_BIN(pipeline), src, demux, decoderv, queueV,sinkv,decodera,convert, resample, sinka, NULL); gst_element_link (src, demux); gst_element_link (queueV, sinkv); // gst_element_link (queueA, convert); gst_element_link (decodera, convert); gst_element_link (convert, resample); gst_element_link (resample, sinka); g_signal_connect (demux, "pad-added",G_CALLBACK (on_pad_added), NULL); //g_signal_connect (decodera, "pad-added",G_CALLBACK(on_decpad_added),decodera); g_signal_connect (decoderv, "pad-added",G_CALLBACK(on_decpad_added),decoderv); /* run */ ret = gst_element_set_state (pipeline, GST_STATE_PLAYING); if (ret == GST_STATE_CHANGE_FAILURE) { GstMessage *msg; g_print ("Failed to start up pipeline!\n"); /* check if there is an error message with details on the bus */ msg = gst_bus_poll (bus, GST_MESSAGE_ERROR, 0); if (msg) { GError *err = NULL; g_print("\nDISPLAY ERROR:\n"); gst_message_parse_error (msg, &err, NULL); g_print ("ERROR: %s\n", err->message); g_error_free (err); gst_message_unref (msg); } return -1; } g_main_loop_run (loop); /* clean up */ gst_element_set_state (pipeline, GST_STATE_NULL); gst_object_unref (pipeline); return 0; } static gboolean bus_call (GstBus *bus, GstMessage *msg, gpointer data) { GMainLoop *loop = data; switch (GST_MESSAGE_TYPE (msg)) { case GST_MESSAGE_EOS: g_print ("End-of-stream\n"); g_main_loop_quit (loop); break; case GST_MESSAGE_ERROR: { gchar *debug = NULL; GError *err = NULL; gst_message_parse_error (msg, &err, &debug); g_print ("Error: %s\n", err->message); g_error_free (err); if (debug) { g_print ("Debug details: %s\n", debug); g_free (debug); } g_main_loop_quit (loop); break; } default: break; } return TRUE; } static void on_decpad_added(GstElement *element, GstPad *pad ) { g_debug ("Signal: decoder pad-added"); GstCaps *caps; GstStructure *str; GstPad *targetsink; caps = gst_pad_get_caps (pad); g_assert (caps != NULL); str = gst_caps_get_structure (caps, 0); g_assert (str != NULL); g_debug ("Linking decoder to QUEUE pad "); // Link it actually //element = (element == decodera ? queueA : queueV); targetsink = gst_element_get_pad ( queueV, "sink"); g_assert (targetsink != NULL); gst_pad_link (pad, targetsink); if (gst_pad_is_linked(pad)) g_print("The decoder pad src was linked\n"); else g_print("The stream:%s pad src was linked\n",gst_pad_get_name(pad)); gst_object_unref (targetsink); gst_caps_unref (caps); } static void on_pad_added (GstElement *element, GstPad *pad) { g_debug ("Signal: pad-added"); GstCaps *caps; GstStructure *str; caps = gst_pad_get_caps (pad); g_assert (caps != NULL); str = gst_caps_get_structure (caps, 0); g_assert (str != NULL); const gchar *c = gst_structure_get_name(str); g_print("on_pad_added: %s\n",c); if (g_strrstr (c, "video") || g_strrstr (c, "image")) { g_debug ("Linking video pad to decoderv"); // Link it actually GstPad *targetsink = gst_element_get_pad (decoderv, "sink"); g_assert (targetsink != NULL); //g_print("\nVIDEO--pad source: %s\n", gst_pad_get_name(pad)); //g_print("\nVIDEO--pad sink: %s\n", gst_pad_get_name(targetsink)); gst_pad_link (pad, targetsink); if (gst_pad_is_linked(pad)) g_print("The video pad src was linked\n"); gst_object_unref (targetsink); } if (g_strrstr (c, "audio")) { g_debug ("Linking audio pad to decodera"); // Link it actually GstPad *targetsink = gst_element_get_pad (decodera, "sink"); g_assert (targetsink != NULL); //g_print("\nAUDIO--pad source: %s\n", gst_pad_get_name(pad)); //g_print("\nAUDIO--pad sink: %s\n", gst_pad_get_name(targetsink)); gst_pad_link (pad, targetsink); if (gst_pad_is_linked(pad)) g_print("The audio pad src was linked\n"); gst_object_unref (targetsink); } gst_caps_unref (caps); } </pre> </blockquote> </body> </html>