Le 20/08/2012 13:07, Burkhard Plaum a écrit :
Hi,
Am 19.08.2012 18:58, schrieb Nicolas Ecarnot:
Hi there,
It's been a long time I wanted to use both diffkey and tracking to
play with a cute effect :
http://www.youtube.com/watch?v=WeQEG_UNnng
I was wondering : as transparency exist as alpha channel in static
picture (gif, png...), does the same exist in videos?
I mean, I'm using transparency every time I'm playing with Cinelerra,
but once my video is rendered, I guess the resulting file has lost any
transparency information... (or not? I don't know?)
It depends on the codec. Typical (end-user) video codecs have no alpha
channel.
But movs with png codec have alpha support.
Burkhard
Hi there,
I've just finished this simple test :
- from a common video, add a mask to dig a transparency hole in the
middle of the area
- export it into mov for linux, with the png+alpha compression (*this*
is the trick)
- the resulting video will be played in vlc with no visible hole
BUT
- loading it in another cinelerra project, and putting it in front of
another video will show the transparency hole !!!!!!!!!!!!
GREAT, a new effect world is opening to me !!!
--
Nicolas Ecarnot
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