error 'not-linked' for appsrc

[Gary Metalle]

Hi


I'm trying to set-up a video encoder pipeline using an appsrc to squirt in raw video from my app and then extract the encoded frames from an appsink:


appsrc -> rawvideoparse -> x264enc -> appsink


I've attached a log of everything of interest (sorry for the formatting, it wasn't taken from a terminal window and has the escape chars in. Sublime has a nice syntax plugin for displaying it but for some reason you can't copy it grrr).

The last few lines of the log are pasted below and below that is a snippet from the source code configuring the pipeline.


It feels like it's a caps issue but I can't see anything too obvious. I have tried without the rawvideoparse element as well and it makes no difference.


I have followed the same code pattern as the basic-tutorial-8.c<https://gstreamer.freedesktop.org/documentation/tutorials/basic/short-cutting-the-pipeline.html?gi-language=c> example for the most part but it's an audio example, not video.


As a test I removed the appsrc and replaced it with a videotestsrc and that worked fine so I'm happy with the appsink.


Any suggestions would be gratefully received.


Gary.




0:00:08.016851745  8181 0x7fff6c007ad0 FIXME                default gstutils.c:3981:gst_pad_create_stream_id_internal:<video_source:src> Creating random stream-id, consider implementing a deterministic way of creating a stream-id
0:00:08.016924133  8181 0x7fff6c007ad0 INFO                GST_PADS gstpad.c:4232:gst_pad_peer_query:<video_source:src> pad has no peer
0:00:08.016991764  8181 0x7fff6c007ad0 INFO               GST_EVENT gstevent.c:814:gst_event_new_caps: creating caps event video/x-raw, format=(string)I420, framerate=(fraction)15/1, pixel-aspect-ratio=(fraction)1/1, width=(int)352, height=(int)288
0:00:08.017022797  8181 0x7fff6c007ad0 INFO               GST_EVENT gstevent.c:895:gst_event_new_segment: creating segment event default segment start=0, offset=0, stop=-1, rate=1.000000, applied_rate=1.000000, flags=0x00, time=0, base=0, position 0, duration -1
0:00:08.017057838  8181 0x7fff6c007ad0 INFO                 basesrc gstbasesrc.c:2945:gst_base_src_loop:<video_source> marking pending DISCONT
0:00:08.017280495  8181 0x7fff6c007ad0 INFO                 basesrc gstbasesrc.c:2965:gst_base_src_loop:<video_source> pausing after gst_pad_push() = not-linked
0:00:08.017364757  8181 0x7fff6c007ad0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<video_source> error: Internal data stream error.
0:00:08.017432686  8181 0x7fff6c007ad0 WARN                 basesrc gstbasesrc.c:3055:gst_base_src_loop:<video_source> error: streaming stopped, reason not-linked (-1)
0:00:08.017486608  8181 0x7fff6c007ad0 INFO        GST_ERROR_SYSTEM gstelement.c:2145:gst_element_message_full_with_details:<video_source> posting message: Internal data stream error.
gst_video: Error: 1(Operation not permitted) message=Internal data stream error.
gst_video: Debug: gstbasesrc.c(3055): gst_base_src_loop (): /GstPipeline:video-encoder-pipeline/GstAppSrc:video_source:
streaming stopped, reason not-linked (-1)

st->streamer.source = gst_element_factory_make("appsrc", "video_source");
st->streamer.parser = gst_element_factory_make("rawvideoparse", "video_parser");
st->streamer.encoder = gst_element_factory_make(st->streamer.element, "video_encoder");
st->streamer.sink = gst_element_factory_make("appsink", "video_sink");

st->streamer.pipeline = gst_pipeline_new("video-encoder-pipeline");

if (!st->streamer.source || !st->streamer.parser || !st->streamer.encoder || !st->streamer.sink || !st->streamer.pipeline) {
warning("gst_video: unable to create one or more of the pipeline elements for the video encoder.\n");
err = EPROTO;
return err;
}

/* Configure appsource */
//gst_video_info_set_interlaced_format(&info, GST_VIDEO_FORMAT_I420, GST_VIDEO_INTERLACED_MODE_INTERLEAVED, size->w, size->h);
//video_caps = gst_video_info_to_caps(&info);
video_caps = gst_caps_new_simple ("video/x-raw",
      "format", G_TYPE_STRING, "I420",
      "framerate", GST_TYPE_FRACTION, st->encoder.fps, 1,
      "pixel-aspect-ratio", GST_TYPE_FRACTION, 1, 1,
      "width", G_TYPE_INT, size->w,
      "height", G_TYPE_INT, size->h,
      NULL);
g_object_set(st->streamer.source, "caps", video_caps, "format", GST_FORMAT_DEFAULT, NULL);
gst_app_src_set_callbacks(GST_APP_SRC(st->streamer.source), &(st->streamer.appsrcCallbacks),
  st, (GDestroyNotify)appsrc_destroy_notify_cb);

/* Configure encoder */
// TODO: not hardcode this but do it by parsing options and checking if an actual property
g_object_set(st->streamer.encoder, "byte-stream", TRUE, "rc-lookahead", 0, "tune", 4, "speed-preset", 1, "sync-lookahead", 0, "bitrate", st->encoder.bitrate / 1000, NULL);

/* Configure appsink. */
g_object_set(st->streamer.sink, "caps", video_caps, NULL);
gst_app_sink_set_callbacks(GST_APP_SINK(st->streamer.sink), &(st->streamer.appsinkCallbacks),
   st, (GDestroyNotify)appsink_destroy_notify_cb);
gst_caps_unref(video_caps);

/* Link everything up inside our pipeline */
gst_bin_add_many(GST_BIN(st->streamer.pipeline), st->streamer.source, st->streamer.parser, st->streamer.encoder, st->streamer.sink, NULL);

/* Bus watch */
bus = gst_pipeline_get_bus(GST_PIPELINE(st->streamer.pipeline));
gst_bus_set_sync_handler(bus, (GstBusSyncHandler)bus_sync_handler_cb,
st, (GDestroyNotify)bus_destroy_notify_cb);
gst_object_unref(GST_OBJECT(bus));




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