[gst-devel] decodebin vs playbin

[Rodney Dowdall]

It's all working now.  I was missing a plugin.  Thanks for all the help, 
and thanks to Totem for telling me about the missing plugin.

Rodney


On 10-06-01 09:53 AM, Rodney Dowdall wrote:
> Hello Thiago
>
> Thanks for your suggestions.  I read the playbin2 docs, and it said 
> that I could use the fakesink's handoff signal to grab the buffer from 
> the playbin2 video.  I tried to set that up, but my signal handler 
> never gets called.  Here is the code snippet that I have:
>
> static void
> cb_handoff (GstElement *fakesink,
>         GstBuffer   *buffer,
>         GstPad      *pad,
>         gpointer     user_data)
> {
>   static gboolean white = FALSE;
>
>   /* this makes the image black/white */
>   printf("new buffer is happening\n");
> }
>
>
> .... Initlization function stuff ....
>
>         videosink = gst_element_factory_make ("fakesink", "videosink");
>         g_object_set (G_OBJECT (videosink), "signal-handoffs", TRUE,  
> NULL);
>         g_signal_connect (videosink, "handoff", G_CALLBACK 
> (cb_handoff), NULL);
>         gs_data->pipeline = gst_element_factory_make ("playbin2", 
> "my-player");
>         g_object_set (G_OBJECT (gs_data->pipeline), "video-sink", 
> videosink, NULL);
>         g_object_set (G_OBJECT (gs_data->pipeline), "uri", 
> "<path_to_mp4>", NULL);
>
> This plays the sound from the mp4, but I can't grab the buffer.  Am I 
> missing a step?  Do I have to setup a video-bin, with a filter, 
> converter, and sink?
>
> Thanks,
> Rodney
>
> On 10-05-31 11:40 PM, thiagossantos at gmail.com wrote:
>>
>>
>> On Mon, May 31, 2010 at 11:53 PM, Rodney Dowdall 
>> <rdowdall at cranksoftware.com <mailto:rdowdall at cranksoftware.com>> wrote:
>>
>>     Hello
>>
>>     I am trying to play the audio and the video from a mp4 file.  If
>>     I run the following line:
>>
>>     gst-launch -vvvvv --gst-debug-level=2 playbin
>>     uri=file:///<path_to_mp4_file>
>>
>>     Then it plays the file's audio.  I'm not putting the video
>>     anywhere, so I can't see if it is playing or not, but I assume it
>>     is based on the debug output.
>>
>>     If I do the following line:
>>
>>     gst-launch -vvv --gst-debug-level=2 filesrc
>>     location=<path_to_mp4_file> ! decodebin2 name=decoder decoder. !
>>     audioconvert ! audioresample ! osssink decoder. !
>>     ffmpegcolorspace ! xvimagesink
>>
>>     It hangs at:
>>
>>     Setting pipeline to PAUSED ..
>>     /GstPipeline:pipeline0/GstDecodeBin2:decoder/GstTypeFindElement:typefind.GstPad:src:
>>     caps = audio/x-m4a
>>     Pipeline is PREROLLING ...
>>     <audio debug output snipped>
>>
>>
>> You need to put 'queue' after each decodebin2's branch to start a new 
>> thread for them. The docs should have some more information about 
>> this: 
>> http://gstreamer.freedesktop.org/data/doc/gstreamer/head/manual/html/chapter-threads.html#section-threads-uses
>>
>>
>>     I need to open this file in C code, and grab access to the
>>     buffers.  I was planning on using appsink to do it, but any time
>>     I pass in a video sink to the pipeline, it just hangs, never
>>     playing the audio, or moving forward.  As I said, I need access
>>     to the video buffer, so either I need a way to grab it from the
>>     pipeline created from gst_parse_launch, or I was thinking that if
>>     I set up the pipeline myself, I could use a handoff signal on the
>>     last video sink, or mayber use the appsink methods.
>>
>>
>> FYI, you can set the video-sink property in playbin2 to your appsink 
>> and get the buffers from there.
>>
>>
>>     I have a feeling that I am missing something simple, and was
>>     hoping someone could point that out.
>>
>>     Thanks,
>>     Rodney
>>     -- 
>>
>>     *Rodney Dowdall
>>     **Crank Software Inc.
>>     **Office*: 613-595-1999
>>     *Online*: www.cranksoftware.com <http://www.cranksoftware.com/>
>>     *Check out*: Crank Software’s Blog <http://cranksoftware.com/blog/>
>>
>>
>>
>>     ------------------------------------------------------------------------------
>>
>>
>>     _______________________________________________
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>>     gstreamer-devel at lists.sourceforge.net
>>     <mailto:gstreamer-devel at lists.sourceforge.net>
>>     https://lists.sourceforge.net/lists/listinfo/gstreamer-devel
>>
>>
>>
>>
>> -- 
>> Thiago Sousa Santos
>
>
> -- 
>
> *
> Rodney Dowdall
> **Crank Software Inc.
> **Office*: 613-595-1999
> *Online*: www.cranksoftware.com <http://www.cranksoftware.com/>
> *Check out*: Crank Software’s Blog <http://cranksoftware.com/blog/>
>
>
>
> ------------------------------------------------------------------------------
>
>    
>
>
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-- 

*
Rodney Dowdall
**Crank Software Inc.
**Office*: 613-595-1999
*Online*: www.cranksoftware.com <http://www.cranksoftware.com/>
*Check out*: Crank Software’s Blog <http://cranksoftware.com/blog/>


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