Issue with decodebin ?

[Darren Staples]

Hi again :)

Is there an issue with using the decodebin element programmatically ?

This command line works fine:
gst-launch filesrc location=file.flv ! decodebin ! ffmpegcolorspace ! ximagesink

But when I try to code it up as follows: (some code left out for clarity)

 // Create gstreamer elements
 pipeline    = gst_pipeline_new( "video" );
  source      = gst_element_factory_make( "filesrc"          , "src" );
  decoder     = gst_element_factory_make( "decodebin"        , "decoder" );
  colorspace1 = gst_element_factory_make( "ffmpegcolorspace" , "colorspace1" );
  sink        = gst_element_factory_make( "ximagesink"       , "sink" );

  if ( !pipeline || !source || !decoder || !colorspace1 || !sink )
  {
    g_printerr( "One element could not be created. Exiting.\n" );
    return -1;
  }

  // Set the input filename to the source element
 g_object_set( G_OBJECT( source ) , "location" , "file.flv" , NULL );

  // Add all elements into the pipeline
 gst_bin_add_many( GST_BIN( pipeline ) , source , decoder , colorspace1 , sink , NULL );

  // Start linking the elements together
 gst_element_link_many( source , decoder , colorspace1 , sink , NULL );

  // Set the pipeline to "playing" state
 gst_element_set_state( pipeline , GST_STATE_PLAYING );

I get an ‘internal data flow error’ as you would see when linking failed.

Any ideas why this might be please ? Does the uridecodebin work any better ?

Thanks for all the help so far :D


Darren

 

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[Wim Taymans]

decodebin dynamically creates source pads as can be seen with
gst-inspect. Please re-read Capter 8 of the application development
manual.

Wim

On Thu, Jan 8, 2009 at 3:13 PM, Darren Staples <[hidden email]> wrote:

> Hi again :)
>
> Is there an issue with using the decodebin element programmatically ?
>
> This command line works fine:
> gst-launch filesrc location=file.flv ! decodebin ! ffmpegcolorspace !
> ximagesink
>
> But when I try to code it up as follows: (some code left out for clarity)
>
>  // Create gstreamer elements
>  pipeline    = gst_pipeline_new( "video" );
>   source      = gst_element_factory_make( "filesrc"          , "src" );
>   decoder     = gst_element_factory_make( "decodebin"        , "decoder" );
>   colorspace1 = gst_element_factory_make( "ffmpegcolorspace" , "colorspace1"
> );
>   sink        = gst_element_factory_make( "ximagesink"       , "sink" );
>
>   if ( !pipeline || !source || !decoder || !colorspace1 || !sink )
>   {
>     g_printerr( "One element could not be created. Exiting.\n" );
>     return -1;
>   }
>
>   // Set the input filename to the source element
>  g_object_set( G_OBJECT( source ) , "location" , "file.flv" , NULL );
>
>   // Add all elements into the pipeline
>  gst_bin_add_many( GST_BIN( pipeline ) , source , decoder , colorspace1 ,
> sink , NULL );
>
>   // Start linking the elements together
>  gst_element_link_many( source , decoder , colorspace1 , sink , NULL );
>
>   // Set the pipeline to "playing" state
>  gst_element_set_state( pipeline , GST_STATE_PLAYING );
>
> I get an 'internal data flow error' as you would see when linking failed.
>
> Any ideas why this might be please ? Does the uridecodebin work any better ?
>
> Thanks for all the help so far :D
>
>
> Darren
>
>
>
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>
> This email message and any attachments may contain information which is
> confidential or privileged and is intended for the sole use of the person to
> whom it is addressed.  If you are not the intended recipient, be aware that
> any disclosures, copying, distribution or use of the contents is
> prohibited.  If you have received this email message in error, please notify
> our office by telephone [phone]) or email
> ([hidden email]) immediately.  Thank you.
>
> ------------------------------------------------------------------------------
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> It is the best place to buy or sell services for
> just about anything Open Source.
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>

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