Alpha video not shown in media player

[mayunadayo]

I removed green screen in after effects, and I exported it as AVI. I could play the alpha video (without background) in media player yesterday, but suddenly I can’t play the alpha video in the media player. Background is black, not transparent anymore. How can I play alpha video ?

[scottunreal]

Make sure to enable Post Processing alpha channel.
Do a search in project settings for alpha. Set to linear color space only. I used EXR format images.