Can someone please help me spot how I'm being stupid? I can play a FLV file using: <div style="margin-left: 40px;">$ gst-launch filesrc location=jerrydog.flv ! ffdemux_flv ! ffdec_flv ! xvimagesink </div> But when I try to play the same file with the following code, it hangs with no output. <div style="margin-left: 40px;">#include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <gst/gst.h> int main(int argc, char** argv) { gst_init(&argc, &argv); GMainLoop* loop = g_main_loop_new(NULL, FALSE); GstPipeline* p = GST_PIPELINE(gst_pipeline_new("pipey")); GstElement* src = gst_element_factory_make("filesrc", "filey"); GstElement* dmx = gst_element_factory_make("ffdemux_flv", "demuxey"); GstElement* dec = gst_element_factory_make("ffdec_flv", "decodey"); GstElement* sink = gst_element_factory_make("xvimagesink", "sinky"); g_object_set(G_OBJECT(src), "location", "jerrydog.flv", NULL); gst_bin_add_many(GST_BIN(p), src, dmx, dec, sink, NULL); gst_element_link_many(src, dmx, dec, sink, NULL); gst_element_set_state(GST_ELEMENT(p), GST_STATE_PLAYING); g_main_loop_run(loop); return 0; } </div> The thing is, I've separately encoded the file to mpeg2, and I can also play it using: <div style="margin-left: 40px;">$ gst-launch filesrc location=jerrydog.mp2 ! mpeg2dec ! xvimagesink </div> and then, puzzlingly, unlike the FLV version, my C code plays the mpeg2 flavor just great: <div style="margin-left: 40px;">#include <unistd.h> #include <stdio.h> #include <stdlib.h> #include <gst/gst.h> int main(int argc, char** argv) { gst_init(&argc, &argv); GMainLoop* loop = g_main_loop_new(NULL, FALSE); GstPipeline* p = GST_PIPELINE(gst_pipeline_new("pipey")); GstElement* src = gst_element_factory_make("filesrc", "filey"); GstElement* dec = gst_element_factory_make("mpeg2dec", "decodey"); GstElement* sink = gst_element_factory_make("xvimagesink", "sinky"); g_object_set(G_OBJECT(src), "location", "jerrydog.mp2", NULL); gst_bin_add_many(GST_BIN(p), src, dec, sink, NULL); gst_element_link_many(src, dec, sink, NULL); gst_element_set_state(GST_ELEMENT(p), GST_STATE_PLAYING); g_main_loop_run(loop); return 0; } </div> So what's confusing me is, in the FLV case, how am I constructing the pipeline wrongly in C, in the FLV case anyway, that differs from gst-launch? Or am I? Is this as dumb a question as it seems to me it must be? Thanks, E. Westbrook PS - All test case source is here exactly as I'm compiling it. My input video files are available at: <a href="http://media.westbrook.com/media/jerrydog.flv">http://media.westbrook.com/media/jerrydog.flv</a> <a href="http://media.westbrook.com/media/jerrydog.mp2">http://media.westbrook.com/media/jerrydog.mp2</a>