Segmentation Fault

[Ian Davidson]

I want to 'read in' a video file, re-code it and write out a new file.
I notice that playbin has video-sink and audio-sink properties which 
apparently allow the video and audio to be sent to other than the 
default locations - so I attempted something like shown below.

It did not work as I wanted - but instead reported a Segmentation 
Fault.  My guess is that I have done something wrong trying to set the 
video-sink property on playbin (and then also the audio-sink property).

Below, I have listed the heart of my program and then the tail of the 
output from GST_DEBUG=4.

I would appreciate any insight as to where I've gone wrong - or a better 
way to achieve my objective!

Ian

loop = g_main_loop_new (NULL, FALSE);

   /* Create gstreamer elements */
   pipeline     = gst_pipeline_new ("av-recorder");
   playbin      = gst_element_factory_make ("playbin",     
"playbin-element");
   queue1a      = gst_element_factory_make ("queue",       "queue1a");
   vidrate      = gst_element_factory_make ("videorate",   "vidrate");
   vidscale     = gst_element_factory_make ("videoscale",  "vidscale");
   vcapsfilter  = gst_element_factory_make ("capsfilter",  "vid-caps");
   queue1       = gst_element_factory_make ("queue",       "queue1");
   vidconvert   = gst_element_factory_make ("videoconvert","vidconvert");
   videnc       = gst_element_factory_make ("x264enc",     "videnc");
   acapsfilter  = gst_element_factory_make ("capsfilter",  "audio-caps");
   queue2       = gst_element_factory_make ("queue",       "queue2");
   audrate      = gst_element_factory_make ("audiorate",   "audrate");
   queue3       = gst_element_factory_make ("queue",       "queue3");
   lameenc      = gst_element_factory_make ("lamemp3enc",  "lameenc");
   mux          = gst_element_factory_make ("mp4mux",      "mp4-mux");
   sink         = gst_element_factory_make ("filesink",    "file-output");
   queue4       = gst_element_factory_make ("queue",       "queue4");



   if (!pipeline || !playbin || !vidrate || !vcapsfilter || !queue1 || 
!videnc || !acapsfilter || !queue2 || !audrate || !queue3 || !lameenc || 
!mux || !sink) {
     g_printerr ("One element could not be created. Exiting.\n");
     return;
   }

   /* Set up the pipeline */


   g_object_set (G_OBJECT (playbin), "uri", 
"file:///home/ian/superRecord/MOV05E.Mpg", NULL);
   g_object_set (G_OBJECT (sink), "location", 
"/home/ian/superRecord/testVid.Mp4", NULL);

   g_object_set (G_OBJECT (videnc), "tune", 0x0004, NULL);   /*zerolatency*/

  g_printerr ("Properties set.\n");
     /* set the video capabilities on the vidcaps element */
/* SET THE VIDEO CAPS    */
   caps = 
gst_caps_from_string("video/x-raw,format=(string)I420,width=720,height=576,framerate=(fraction)25/1");
   g_object_set (G_OBJECT (vcapsfilter), "caps", caps, NULL);
   gst_caps_unref (caps);

/* set the audio capabilities on the audiocaps element */
   caps = gst_caps_from_string("audio/x-raw,rate=44100,channels=1");
   g_object_set (G_OBJECT (acapsfilter), "caps", caps, NULL);
   gst_caps_unref (caps);


   /* add a message handler */
   bus = gst_pipeline_get_bus (GST_PIPELINE (pipeline));
   bus_watch_id = gst_bus_add_watch (bus, bus_call, loop);
gst_object_unref (bus);

   /* add all elements into the pipeline */
    gst_bin_add_many (GST_BIN (pipeline),
       playbin, queue1a, vidrate, vidscale, vcapsfilter, queue1, 
vidconvert, videnc,
       queue4, acapsfilter, queue2, audrate, queue3, lameenc,
       mux, sink,  NULL);

   /* link the elements together */

     if (!gst_element_link_many (queue1a, vidrate, vidscale, 
vcapsfilter, queue1, videnc, mux, NULL)) {
       g_printerr ("Failed to link queue1a, vidrate, vidscale, 
vcapsfilter, queue1, videnc, mux. Exiting.\n");
       return;
     }
     if (!gst_element_link_many (queue4, acapsfilter, queue2, audrate, 
queue3, lameenc, mux, NULL)) {
       g_printerr ("Failed to link queue4, acapsfilter, queue2, audrate, 
queue3, lameenc, mux. Exiting.\n");
       return;
     }


g_print ("Most Links Linked!\n");

     if (!gst_element_link_many (mux, sink, NULL)) {
       g_printerr ("Failed to link mux to sink. Exiting.\n");
       return;
     }

g_print ("All Links Linked!\n");
g_print ("Link Video-Sink of playbin\n");

   g_object_set (G_OBJECT (playbin), "video-sink", "queue1a", NULL);
g_print ("Link Audio-Sink of playbin\n");
   g_object_set (G_OBJECT (playbin), "audio-sink", "queue4", NULL);

   /* Set the pipeline to "playing" state*/
gst_element_set_state (pipeline, GST_STATE_PLAYING);



   /* Iterate */
   g_main_loop_run (loop);



Most Links Linked!
0:00:02.273452582  1690  0x9368bc0 INFO        GST_ELEMENT_PADS 
gstutils.c:1543:gst_element_link_pads_full: trying to link element 
mp4-mux:(any) to element file-output:(any)
0:00:02.273503575  1690  0x9368bc0 INFO                GST_PADS 
gstutils.c:936:gst_pad_check_link: trying to link mp4-mux:src and 
file-output:sink
0:00:02.273581778  1690  0x9368bc0 INFO                GST_PADS 
gstutils.c:1443:prepare_link_maybe_ghosting: mp4-mux and file-output in 
same bin, no need for ghost pads
0:00:02.273625793  1690  0x9368bc0 INFO                GST_PADS 
gstpad.c:2120:gst_pad_link_prepare: trying to link mp4-mux:src and 
file-output:sink
0:00:02.273674557  1690  0x9368bc0 INFO                GST_PADS 
gstpad.c:2322:gst_pad_link_full: linked mp4-mux:src and 
file-output:sink, successful
0:00:02.273708267  1690  0x9368bc0 INFO               GST_EVENT 
gstevent.c:1313:gst_event_new_reconfigure: creating reconfigure event
0:00:02.273737465  1690  0x9368bc0 INFO               GST_EVENT 
gstpad.c:5083:gst_pad_send_event_unchecked:<mp4-mux:src> Received event 
on flushing pad. Discarding
All Links Linked!
Link Video-Sink of playbin
Segmentation fault