[PD] pix_film ignoring alpha channel on Mac OS

[Matteo Sisti Sette]

Hi,

On Mac OS, pix_film seems to ignore the alpha channel of videos encoded 
with the Apple Animation codec. It works fine on Linux (same patch, same 
video files), but on Mac OS transparent pixels are displayed as opaque 
black.

I have already sent [pix_film] the "colorspace RGBA" message.

Is there a way to get it to work on Mac OS too?

Thanks
m.