Hi,

No, I am not using pix_alpha, because that's not what I need.
pix_alpha changes the value of the alpha channel, so that pixels within a given range of colors _become_ transparent.

In my case the video file itsalf already has an alpha channel and I want the pixels that are transparent to remain transparent.

Thanks
m.

On 04/04/2011 07:13 PM, tim vets wrote:

Hi Matteo,
are you using pix_alpha?
you could try this patch here, which works on my system, with a video
encoded as "JPEG still images" (properties window video tab in gnome)
ubuntu 10.10, pd 0.42-5 extended.
gr,
Tim

2011/4/4 Matteo Sisti Sette <matteosistisette@gmail.com

<mailto:matteosistisette@gmail.com>>

   Hi,

   I'm trying this:

   [pix_film]
     |
   [pix_texture]
     |
   [alpha]
     |
   [rectangle]

   I'm using some videos that have an alpha channel and I had tried
   them previously in Windows and Mac and they were rendered correctly
   with their transparent background.

   Now I am trying the same in Linux and the videos are opaque, as if
   they didn't have an alpha channel or as if they had an opaque black
   background.

   I've already tried sending "colorspace RGBA" to pix_film, but
   nothing changes.

   I'm almost sure the videos were encoded with the Apple Animation+
   encoder but if i right-click them in Ubuntu and select "properties"
   it says "run-length encoder". What is sure is that i tested them in
   Windows and Linux and used to work.

   Any idea?

   thanks
   m.

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