Any way extract usm video with alpha channel? by mizuka at 7:40 AM EDT on May 12, 2021

The source usm file use vp9 encode, and the result of m2v file drop the alpha channel, is there any way to change the m2v's background or make it transparent?

by bnnm at 10:37 AM EDT on May 14, 2021

Alpha channel in .usm is stored separate from video, but I'm not sure how it could be used.

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