playbin2 connected to

[Stefan Sauer]

On 10/11/2011 05:01 PM, Steve wrote:
> Hi Guys,
>
> I am trying to modify wxMediaCtrl so that I can save a file.
>
> wxMediaCtrl uses playbin (which I am updating to playbin2).  I have
> experimented with GST_PLAY_FLAG_DOWNLOAD, but the quality is not really good
> enough.
>
> So I am trying to create a new top-level bin containing the following
>
> tee name=t ! t. ! queue ! ffmpegcolorspace ! ximagesink ! t. ! queue
> videorate ! video/x-raw-yuv,framerate=10/1 ! y4menc ! filesink
> location=vid_tmp_mkv
tee name=t  t. ! queue ! ffmpegcolorspace ! ximagesink  t. ! queue
videorate ! video/x-raw-yuv,framerate=10/1 ! y4menc ! filesink
location=vid_tmp_mkv

two ! too much, but in the code it looks alright. You could use GST_DEBUG_BIN_TO_DOT_FILE to get a graph of the resulting pipleine

Stefan

> I then attach playbin2 to bin via its video-sink property with ghostpads.  
>
> My issue is that I get nothing.  No errors just a blank screen.
>
> The code follows.
>
> Many thanks in advance for your help.
>
> Regards
>
> Steve
>
> //--------------------------------------------------------------------------
> ---
> // wxGStreamerMediaBackend::DeviceCapture
> //
> // Used to Capture and store input from a local device (eg /dev/video0) in a
> specified file.
> //--------------------------------------------------------------------------
> ---
> //bool wxGStreamerMediaBackend::DeviceCapture(const gchar* fileSaveName,  //
> If NULL just plays device, doesn't save.
> //          const wxString& inputDevice, // Defaults to /dev/video0
> //          const wxString& gst_encoder, // Defaults to y4menc
> //          long encode_quality,         // Defaults to encoder default
> //          long framesSecond)         // Defaults to 10/1
> bool wxGStreamerMediaBackend::DeviceCapture()
> {
>       // Pause video and delete Bin.    
>  
>       g_printerr ("DeviceCapture starts.\n");
>       // Set playbin to ready to stop the current media...
>       if( gst_element_set_state (m_playbin,
>                                GST_STATE_READY) == GST_STATE_FAILURE ||
>         !SyncStateChange(m_playbin, GST_STATE_READY))
>       {
>           wxLogSysError(wxT("wxGStreamerMediaBackend::Load - ")
>                         wxT("Could not set initial state to ready"));
>               return false;
>       }
>       // free current media resources
>       gst_element_set_state (m_playbin, GST_STATE_NULL);
>       //
>       // Create DeviceCapture object
>       //
>       GstElement *bin, *videotee, *monitorqueue,  *filequeue, *colorspace,
> *encoder, *filesink; 
>       GstPad *pad, *ghostpad;
>       // Create elements
>       bin = gst_bin_new ("sink_bin");
>         
>       videotee = gst_element_factory_make ("tee", "videotee");
>       monitorqueue = gst_element_factory_make ("queue", "monitorqueue");
>       filequeue = gst_element_factory_make ("queue", "filequeue");
>       colorspace = gst_element_factory_make ("ffmpegcolorspace",
> "colorspace");
>  
>       // Setup video sink - first try gconf, then auto, then xvimage and
>       // then finally plain ximage
>       GstElement* videosink = gst_gconf_get_default_video_sink();
>       if( !TryVideoSink(videosink) )
>       {
>    videosink = gst_element_factory_make ("autovideosink", "video-sink");
>    if( !TryVideoSink(videosink) )
>    {
>        videosink = gst_element_factory_make ("xvimagesink", "video-sink");
>        if( !TryVideoSink(videosink) )
>        {
>     // finally, do a final fallback to ximagesink
>     videosink =
>         gst_element_factory_make ("ximagesink", "video-sink");
>     if( !TryVideoSink(videosink) )
>     {
>         g_object_unref(videosink);
>         wxLogSysError(wxT("Could not find a suitable video sink"));
>         return false;
>     }
>        }
>    }
>       }
>  
>       encoder = gst_element_factory_make ("y4menc", "videoenc");
>       filesink = gst_element_factory_make ("filesink", "filesink");
>  
>
>       // Error reporting
>       if (!bin|| !colorspace || !encoder
>  || !videotee ) {
>    g_printerr ("One element could not be created.\n");
>    return NULL;
>       }
>  
>       // Set paramaters for the GstElements
>       g_object_set (G_OBJECT (filesink), "location", "tmp_vid.mkv", NULL);
>       
>       // add elements to pipeline
>       gst_bin_add_many (GST_BIN (bin),
>  colorspace, encoder, videotee, monitorqueue, videosink, filequeue,
> filesink, NULL);
>       pad = gst_element_get_static_pad (videotee, "sink");
>       ghostpad = gst_ghost_pad_new ("sink_pad", pad);
>       gst_element_add_pad(bin, ghostpad); 
>       // link elements.
>       gst_element_link_many( videotee, monitorqueue, colorspace, videosink,
> NULL );
>       gst_element_link_many( videotee, filequeue, NULL );
>  
>       // Create caps stuff
>       GstCaps *caps;
>       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, 288,
>     "framerate", GST_TYPE_FRACTION, 10, 1,
>     NULL);
>       gboolean link_ok;
>       link_ok = gst_element_link_filtered (filequeue, encoder, caps);
>       if (!link_ok) {
>  g_warning ("Failed to link filequeue and encoder.");
>       }
>       gst_caps_unref (caps);
>  
>       if (!GST_IS_ELEMENT(bin))
>       {
>    if(G_IS_OBJECT(bin))
>        g_object_unref(bin);
>    wxLogSysError(wxT("Got an invalid bin"));
>    return false;
>       }
>       gst_element_link_many( encoder, filesink, NULL );
>  
> //     // Now that we know (or, rather think) our video and audio sink
> //     // are valid set our playbin to use them
>     g_object_set (G_OBJECT (m_playbin),
>                   "video-sink", bin,
>                    NULL);
>  
>     // Try to pause media as gstreamer won't let us query attributes
>     // such as video size unless it is paused or playing
>     if( gst_element_set_state (m_playbin,
>                                GST_STATE_PAUSED) == GST_STATE_FAILURE ||
>         !SyncStateChange(m_playbin, GST_STATE_PAUSED))
>     {
>         return false; // no real error message needed here as this is
>                       // generic failure 99% of the time (i.e. no
>                       // source etc.) and has an error message
>     }
>     g_printerr ("DeviceCapture activated.\n");
>  
>     return true;
> }
>
>
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