[gst-devel] video file and pad...

[fabien]

Hello,
I tested your code, but it still doesn't work. If I comment the video 
part, the audio is playing (from avi file but not from mpeg..). So it 
must be an error on the video pipeline. I made a sketch of the pipeline...
If anyone could find the error, it would be of great help for me.
Thank you


Erwan Masson a écrit :
> Hello,
> My code are always messy, and maybe you need to do some g_object_unref 
> to clean(see the last line in comment), but this code works.
>
> A new pad callback function:
> static void
> cb_new_pad (GstElement *element,
>      GstPad     *pad,
>      gpointer    data)
> {
>   GstPad *sinkpad;
>   GstCaps *caps;
>   GstStructure *str;
>   gint i, max;
>
>     caps = gst_pad_get_caps (pad);
>
>     str = gst_caps_get_structure (caps, 0);
>   /* We can now link this pad with the audio or video  decoder */
>   g_print ("\n Dynamic pad created, linking parser/decoder \n");
>     if (g_strrstr (gst_structure_get_name (str), "video"))
>     {
>         g_print("Video link\n");
>        
>         max = gst_structure_n_fields (str); // Récupère le nombre de 
> field dans la structure
>    
>       for(i=0;i<max; i++){
>           g_print("\n Nom de la structure %s \n", 
> gst_structure_nth_field_name (str, i)); // Recupère le nom de la 
> structure.
>       }
>         g_print(gst_caps_to_string(caps));
>         //Add now the video thread in the main pipeline
>         gst_bin_add(GST_BIN(pipeline), pipeVideo);
>         //Put the pipeline video on state ready (It can bug if it is 
> not init to ready)
>         gst_element_set_state (pipeVideo, GST_STATE_READY);
>         //Retrieves the sink pad of the pipevideo(the ghost pad)
>         sinkpad = gst_element_get_pad (pipeVideo, "sink");    
>   
>         //If the pileline is already link, stop here
>         if (GST_PAD_IS_LINKED (sinkpad)) return;
>
>        //You can add here a notify caps:
>         //g_signal_connect(sinkpad,    
> "notify::caps",G_CALLBACK(cb_notify_caps), NULL);
>
>         //Link the main pipeline pad with the pipeline video pad
>         if (gst_pad_link(pad, sinkpad)!= GST_PAD_LINK_OK)
>         {
>             g_error("Cannot link video\n");
>             return;
>         }
>         //Put the state at pause, it can be crash if not init
>         gst_element_set_state (pipeVideo, GST_STATE_PAUSED);
>
>     }
>
>   if ( g_strrstr (gst_structure_get_name (str), "audio"))
>     {
>         g_print("Audio link\n");
>        
>         gst_bin_add(GST_BIN(pipeline), pipeAudio);
>         gst_element_set_state (pipeAudio, GST_STATE_READY);
>         sinkpad = gst_element_get_pad (pipeAudio, "sink");
>         if (GST_PAD_IS_LINKED (sinkpad)){
>             g_print("Already link");
>         }
>        
>         if (gst_pad_link(pad, sinkpad) != GST_PAD_LINK_OK)
>         {
>             g_error("Cannot link audio\n");
>             return;
>         }
>         //g_print("Audio paused\n");
>     //    gst_element_set_state (pipeAudio, GST_STATE_PAUSED);
>     //    g_print("Audio playing\n");
>         //gst_element_set_state (pipeAudio, GST_STATE_PLAYING);
>     //    g_print("Video playing\n");
>     //    gst_element_set_state (pipeVideo, GST_STATE_PLAYING);
>         //g_print("pipe playing2\n")    
>          if(!haveTypeAudio){
>              g_print("Type de l'audio pas encore trouvé %d \n", 
> video_frames);
>              return;
>          };
>        
>         gst_element_set_state (pipeline, GST_STATE_PLAYING);
>       //gst_object_unref (sinkpad);       
>   }
> }
>
> 2007/5/6, fabien < fabien.castan at free.fr <mailto:fabien.castan at free.fr>>:
>
>     Hello,
>
>     It's me again. I tried and I tried by I still can't read a video
>     file.
>     So I tried to write the smallest and simplest code possible, based on
>     the example that was sent to the mailing list.
>     The only thing missing is the connection of the "pad" in the
>     "cb_new_pad()" function and without this connection nothing can
>     really
>     happen..
>     I added the video pipeline to the global pipeline, but there must be
>     something missing and I don't know what?
>     I've attached the file to this e-mail.
>
>     Thanks for your patience
>
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