J'ai trouvé sur un site un problème similaire :
hi everbody,
...
i hope someone could help me with a problem i have in qc. i want to use a quicktime movie in a particle generator which works fine so far. but i need transparency everywhere there is a white area in this mov. so my question is - how?
i first tried png as the format for the movie since alpha does work in static png images, but without any result. qc always shows to hole movie including the white areas.
is it even possible?
réponse :
you can use an alpha channel un QT. Look at this 3 files here:
(lien mort)
You can compress your movie with PNG, JP2 (jpeg2000), TGA, TIFF, or Animation Codec, be sure that you have specified to compress with millions of colors (millions of colors alpha).
In QC set the billboard's blending to over.