Render text at certain moments with GnlComposition

[Thibault Saunier]

Hello,

Have you tried using the Gstreamer Editing Services to do that?
Transitions and text overlay are supported already:

*http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESTimelineTextOverlay.html
*http://gstreamer.freedesktop.org/data/doc/gstreamer/head/gstreamer-editing-services/html/GESTimelineStandardTransition.html

I know it is not really the answer to your technical question but GES
seems to be best suited for this particular problem. Also as GES is
built upon gnonlin, you could have a look at the code to see how we
handle that.

Regards,

Thibault Saunier

On Mon, 2011-11-21 at 18:03 -0200, Rossana Guerra wrote:
> Hello, I have a Gnlcomposition with 2 gnlfilesources (videofiles), I
> need to render text in a customizable manner. For instance, at certain
> time file1 needs text over it and file2 doesn't and viceversa or even
> both could need the text rendered over them.
> I could put a text in the common queue, so it always appears and it
> isn't the needed behavior. 
> 
> I appreciate any clue, thanks
> 
> Rossana
> 
> 
> The pipeline
> 
> 
> GnlComposition
> 
>   gnlfilesource1 
> 
> --------------------gnlOperarion--------queue-----sink     // I put
> the textoverlay between the queue and the sink
>   gnlfilesource2
> 
> 
> gnlOperation   //for crossfade purposes
> 
>      alpha1
>                ----------videomixer--------ffmpegcolor
>      alpha2
> 
> 
> 
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