Le 20/08/2012 21:34, Nicolas Ecarnot a écrit :
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 !!!
Hi,
Today, i'm trying to play with these transparent movies I'm importing
into Cinelerra, and there's a point I'm missing.
When I create a transparent video from Cinelerra (for example, using a
mask and "transparenting" a part of the picture) and export it, I can
use it in another Cinelerra project and its transparency is respected.
Now I'm creating another transparent video from Cinelerra that is using
a transparent .png image.
When importing this video into another Cinelerra project, the
transparency has gone.
Seems like the only transparency being respected/recorded is the one
coming from the Cinelerra masks, or at least the one that was "produced"
by Cinelerra.
Has anyone ever noticed that?
--
Nicolas Ecarnot
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