Use of GstAppSrc for video streaming

[wally_bkg]

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Lauraire wrote:
> 
> Hi,
> 
> I am facing difficulties with the use of GstAppSrc : my idea is to feed
> the built pipeline with buffer that I have already treated from a
> streaming flow (I know the data : _avPacket.data and I know the size
> _avPacket.size).
> 
> I've try to follow API explanations and examples to implement my
> application but i still have a green display...  What am I doing wrong?
> 
> 1 - I have succesfully tested the pipeline with cmd line,
> 2 - The buffer's size varies each time : I don't know if I take this into
> account,
> 3 - I defined the GstAppSrc's caps... but still not sure... The stream is
> a mpeg2 video with mepgTS container.
> 4 - Is it an incompatible format pixel....?
> _________________________________________
> 
> Here is part of my code :
> 
>     if( _videoCodec == CODEC_ID_MPEG2VIDEO ||
>         _videoCodec == CODEC_ID_H264)
>     {
>         GMainLoop *loop;
>         GstBus *bus;
> 
>         GstElement *pipeline, *appsrc, *demuxer, *decoder, *postprocess,
> *videosink;
>         loop = g_main_loop_new (NULL, FALSE);
> 
>         /* Create gstreamer elements */
>         pipeline    = gst_pipeline_new ("pipeline");
>         appsrc      = gst_element_factory_make ("appsrc", "app-src");
>         decoder     = gst_element_factory_make ("vdpaumpegdec",
> "vdpau-decoder");
>         demuxer     = gst_element_factory_make ("mpegtsdemux",
> "mpeg-demux");
>         postprocess = gst_element_factory_make ("vdpauvideopostprocess",
> "vdpau-video-post-process");
>         videosink   = gst_element_factory_make ("vdpausink",
> "vdpau-sink");
> 
>         /* set the capabilities of the appsrc element */
>         GstCaps *caps = gst_caps_new_simple ("video/mpeg",
>                                 "width", G_TYPE_INT, 720,
>                                 "height", G_TYPE_INT, 576,
>                                 "framerate", GST_TYPE_FRACTION, 25, 1,
>                                 "bpp", G_TYPE_INT, 16,
>                                 "depth", G_TYPE_INT, 16,
>                                 "endianness", G_TYPE_INT, G_BYTE_ORDER,
>                                 NULL);
> 
>         gst_app_src_set_caps(GST_APP_SRC(appsrc), caps);
> 
>         /* we add all elements into the pipeline */
>         /* we link the elements together */
>         gst_element_link (appsrc, demuxer);
>         gst_element_link_many (decoder, postprocess, videosink, NULL);
>         g_signal_connect (demuxer, "pad-added", G_CALLBACK (on_pad_added),
> decoder);
> 
>         /* play */
>         gst_element_set_state (pipeline, GST_STATE_PLAYING);
> 
>         /* create the buffer */
>         GstBuffer *buffer = gst_buffer_new();
>         GST_BUFFER_DATA (buffer) = _avPacket.data;
>         GST_BUFFER_SIZE (buffer) = _avPacket.size;
>         printf("BUFFER_SIZE = %d \n", _avPacket.size);
> 
>         /* push the buffer to pipeline via appsrc */
>         GstFlowReturn gstFlowReturn =
> gst_app_src_push_buffer(GST_APP_SRC(appsrc), buffer);
> 
>         /* and loop... */
>         g_main_loop_run (loop);
> 
>         /* clean up */
>         gst_element_set_state (pipeline, GST_STATE_NULL);
>         gst_object_unref (GST_OBJECT (pipeline));
> 
> ________________________________________________
> 
> Thanks for your help!
> 


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