Hi,  Some of people are asking a C code example for their application. I was on the same problem a few weeks, I will give you a sample of my code. My code was so horrible(lots of code in comments) that I was forced to cut a (callback like hand off signal and typefind signal). So It is just an example, you will have to code yourself the bus fonction(see in doc), and also the callback function: new padd added. With that structure, I was able to grab frame video and audio, to synchronise manually audio and video buffers (after a frame audio and video it stop to lets the other thread do the same frame). Hope this help you a bit, Erwan Masson <blockquote style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;" class="gmail_quote">/* Main pipeline */   pipeline = gst_pipeline_new ("Main pipeline");   source = gst_element_factory_make ("filesrc", "file-source");   /* the parser got 2 dynamic output pad, you will have to link them to your audio thread and video thread */   parser = gst_element_factory_make ("decodebin", "decodebin-parser");     /* Audio Pipeline */   pipeAudio = gst_pipeline_new ("audio-player ");   /* A queue is needed to synchronise with Video thread */     aqueue = gst_element_factory_make("queue", "aqueue");   decoder = gst_element_factory_make ("identity", "identity-decoder-audio");   conv = gst_element_factory_make ("audioconvert", "converteraudio");    /* Identity, useful for add handdoff signal (to grab a sample) */   aconv2 = gst_element_factory_make ("identity", " identity conv2");   /* With typefind you are able to retrieves some info in the signal */   afind = gst_element_factory_make ("typefind", "typefindaudio");   sink = gst_element_factory_make ("alsasink", "alsa-output");          /* Video Pipeline */   pipeVideo = gst_pipeline_new ("video-player");   /* queue usefull to synchronize with audio thread */     vqueue = gst_element_factory_make("queue", "vqueue");   vdecoder = gst_element_factory_make ("identity", "identity-decoder");    vconv = gst_element_factory_make ("ffmpegcolorspace", "convertervideo");   /* Use capsfilter if you want to convert to RGB (default ffmpeg output is YUV */   vcapsfilter = gst_element_factory_make ("capsfilter", "restreint le caps");   g_object_set (G_OBJECT (vcapsfilter), "caps",           gst_caps_new_simple ("video/x-raw-rgb",                      "bpp", G_TYPE_INT, 32,                      "depth", G_TYPE_INT, 32,                      NULL)             , NULL);     /* Put a handoff signal on identity and you will grab video frame */   vconv2 = gst_element_factory_make ("identity", "identity-vconv2");      g_signal_connect (vconv2, "handoff", G_CALLBACK (cb_handoff_video), NULL);   /* use typefind if you want to grab some info on video, like width, height....*/   vfind = gst_element_factory_make ("typefind", "typefindVideo2");    vsink = gst_element_factory_make ("fakesink", "video-fake-output");       /* You need to test all Element to see if they are created */   if (!pipeline || !source || !parser || !decoder || !conv || !sink) {     g_print ("One element could not be created 1\n");     if (!decoder)        g_print("decoder\n");     if (!parser)         g_print("parser\n");     if (!source)         g_print("source\n");     if(!conv)         g_print("conv\n");     if(!pipeline)         g_print("pipeline\n");     if(!sink)         g_print("sink\n");     return -1;   }   if (!vqueue || !aqueue  || !vdecoder || !vconv || !vsink) {     g_print ("One element could not be created 2\n");     return -1;   }     g_object_set (G_OBJECT (source), "location","myFileName.avi", NULL); /* Add a  bus to catch Information */   bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));   gst_bus_add_watch (bus, cb_bus_call, loop);   gst_object_unref (bus);    bus = gst_pipeline_get_bus (GST_PIPELINE (pipeVideo));   gst_bus_add_watch (bus, cb_bus_call, loop);   gst_object_unref (bus); /* Video pipeline */ /* Add element in pipeline */   gst_bin_add_many (GST_BIN (pipeVideo), vqueue, vdecoder, vconv, vcapsfilter, vconv2, vfind, vsink, NULL);    /* Link element in pipeline */   gst_element_link_many (vqueue, vdecoder,  vconv, vcapsfilter, vconv2,  vfind , vsink, NULL);   /* Set the ghost pad for the viedo pipeline (pad for input)*/   pad = gst_element_get_pad (vqueue, "sink");    gst_element_add_pad (pipeVideo, gst_ghost_pad_new ("sink", pad));    gst_object_unref (GST_OBJECT (pad));     /* Audio pipeline */   gst_bin_add_many (GST_BIN (pipeAudio),aqueue, decoder, conv, aconv2, afind, sink, NULL);     gst_element_link_many (aqueue, decoder, conv, aconv2, afind, sink, NULL);   pad = gst_element_get_pad (aqueue, "sink");   gst_element_add_pad (pipeAudio, gst_ghost_pad_new ("sink", pad));   gst_object_unref (GST_OBJECT (pad));   /* Main pipeline */   gst_bin_add_many (GST_BIN (pipeline), source, parser, NULL);   gst_element_link (source, parser);   /* link together - note that we cannot link the parser and    * decoder yet, because the parser uses dynamic pads. For that,GST_STATE_READY    * we set a pad-added signal handler. */   g_signal_connect (parser, "pad-added", G_CALLBACK (cb_new_pad), NULL);             /* Now set to playing and iterate. */   g_print ("Setting to PLAYING\n");   gst_element_set_state (pipeline, GST_STATE_PLAYING);     g_print ("Running\n");   g_main_loop_run (loop); </blockquote>