[gst-devel] textoverlay and dynamic text - to subtitle or not and if so how?

[Andoni Morales]

2010/11/9 HaroldJRoth <dlafferty at gmail.com>:
>
> Can textoverlay be used to apply dynamically generated text to a frame?
>
> Background:
>
> I noticed that textoverlay allows manual setting of the "text" property.
> Alternatively, the 'subparse' element can be used feed the 'text_sink' pad.
> Presumably 'subparse' merely decodes "appplication/x-subtitle" and other
> MIME formats
>
> My problem is to run an event handler that cross references the TIMESTAMP to
> CCTV-specific text.
>
> Design alternatives:
>
> The static text could be set by an event handler able to do the lookup.  The
> event would have to be triggered whenever overlay received a new time stamp.
> Unfortunately, such an event is not exposed.
>
> Alternatively, I could use a 'subparse'.  To do that I guess I would have to
> create an appsrc that generated "application/x-subtitle" output.  However, I
> can't seem to find a specification for the encoding of text that I need to
> feed to the subparse.  Maybe reading the subparse source code will tell me
> enough, but an RFC or other spec should would be handy.

You could also use the 'textrender' element, which support plain text
and pango markup.

andoni
>
> Finally, I could try to feed the 'text_sink' pad of the textoverlay.
> However, I'd need to understand the format of the input the pad expects.
> Presumably I have to cross reference text with a TIMESTAMP.
>
> Since its a really useful feature to custom apps, I'm wondering if anyone
> has any suggestions.  As before, I'll try to find a way to post the ultimate
> solution under with some useful keywords.
> --
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-- 
Andoni Morales Alastruey

LongoMatch:The Digital Coach
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