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POwhy is gstreamer caps is blocking pipeline
 

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  1. POwhy is gstreamer caps is blocking pipeline
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    <p>I am trying a basic pipeline below. If I run the pipeline without the caps function it passes straight through (assuming same I/O format). Once I add the caps the pre-roll starts but the video does not continue through to the sink output. </p> <p>Am I coding this wrong?</p> <p>thx Art </p> <pre><code> #include &lt;gst/gst.h&gt; #include &lt;glib.h&gt; static void on_pad_added (GstElement *element, GstPad *pad, gpointer data) { GstPad *sinkpad; GstElement *decoder = (GstElement *) data; g_print ("Dynamic pad created, linking out/in \n"); sinkpad = gst_element_get_static_pad (decoder, "sink"); gst_pad_link (pad, sinkpad); gst_object_unref (sinkpad); } int main (int argc, char *argv[]) { GMainLoop *loop; gboolean link_ok; GstElement *pipeline, *source, *decoder, *ffcs, *vidsc, *capsfout, *sink; GstBus *bus; GstCaps *caps; /* Initialisation */ gst_init (&amp;argc, &amp;argv); loop = g_main_loop_new (NULL, FALSE); /* Create gstreamer elements */ pipeline = gst_pipeline_new ("video-player"); source = gst_element_factory_make ("filesrc", "file-source"); decoder = gst_element_factory_make ("decodebin2", "dec-bin2"); ffcs = gst_element_factory_make ("ffmpegcolorspace", "ffcs"); vidsc = gst_element_factory_make ("videoscale", "vidsc"); capsfout = gst_element_factory_make ("capsfilter", "capsfout"); sink = gst_element_factory_make ("filesink", "vidout"); if (!pipeline || !source || !decoder || !ffcs || !vidsc || !capsfout || !sink) { g_printerr ("One element could not be created. Exiting.\n"); return -1; } /* we set the input/output filename to the source element */ g_object_set (G_OBJECT (source), "location", argv[1], NULL); g_object_set (G_OBJECT (sink), "location", argv[2], NULL); bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline)); gst_bin_add_many (GST_BIN (pipeline), source, decoder, ffcs, vidsc, capsfout, sink, NULL); /* we link the elements together */ gst_element_link (source, decoder); gst_element_link (decoder, ffcs); gst_element_link (ffcs, vidsc); caps = gst_caps_new_simple("video/x-raw-yuv", "format", GST_TYPE_FOURCC, GST_MAKE_FOURCC ('I', '4', '2', '0'), "width", G_TYPE_INT, 384, "height", G_TYPE_INT, 216, "framerate", GST_TYPE_FRACTION, 25, 1, NULL); link_ok = gst_element_link_filtered(vidsc,sink,caps); gst_caps_unref (caps); if (!link_ok) { g_warning ("Failed to link vidsc to sink!"); }else{ g_print("seems ok, no error reported?\n"); } /* Set the pipeline to "playing" state*/ g_print ("Now playing: %s\n", argv[1]); gst_element_set_state (pipeline, GST_STATE_PLAYING); /* Iterate */ g_print ("Running...\n"); g_main_loop_run (loop); /* Out of the main loop, clean up nicely */ g_print ("Returned, stopping playback\n"); gst_element_set_state (pipeline, GST_STATE_NULL); g_print ("Deleting pipeline\n"); gst_object_unref (GST_OBJECT (pipeline)); return 0; } </code></pre>
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