(CCing the list to keep the thread within)
convert your ..blm files into .mov and do it in gem. whatever you need zmoelnig offers it. since decades. please rtfm. your descrition of needs is a little bit
I am afraid my question was about something different. I am not trying to render sth into a movie, nor display a movie. I am trying to read a .blm file and get the pixel data from it as pd messages so that I can light up anything (eg. graphical bang objects) as pixels.