[gst-devel] Make transparent a specific color inside a video

[Jan Schmidt]

On Fri, 2009-10-30 at 12:25 +0100, megabug wrote:
> 
> Hi,
> 
> 
> 
> I have two videos:
> 1 - An animated "title" text video (letters moving around with a
> complex schema) with a black background.
> 2 - Another video taken with a camera
> 
> 
> 
> Using libpigment, I tried to put the video 1 over video 2 but the
> black background of titles is not transparent and covers the second
> video. If I try to change alpha value on the whole video the black
> will be mixed with the second video making it darker.

You can use the 'alpha' element to perform 'green-screening',
selectively converting a given color range to transparency. It would be
better/more efficient overall to use a format for the titles that
supports an alpha channel already, however - such as PNG files.

Regards,
Jan.

> 
> 
> 
> Is it possible to make transparent a only part of the video with a
> specific color (the black on the first video in my case)?
> 
> 
> 
> -- 
> megabug
> 
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-- 
Jan Schmidt <thaytan at noraisin.net>