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convert .mov file with alpha to webm

Posted: Mon Jan 22, 2018 4:49 am
by telferman
i created the .mov file in adobe after effects, and want to preserve the alpha while converting it to webm, which will be applied as a video to a geometry plane in unity 2017 game software. the .mov file is 6MB and i have had a successful simple conversion using:

ffmpeg -i filename output.webm

but that doesn't have alpha and gives me a warning about the data not being aligned and possible speed loss

thanks

gary