Keynote 10 Cannot insert video in presentation
In an old presentation an inserted video .mov file wont play. I also cannot insert a new video and get the error "cannot decode" Same problem with a mp4 video
MacBook Pro 13″, macOS 10.15
Catalina can only accept 64 bit applications and media files, therefore some older filetypes are no longer compatible, check the list here: incompatible media in Catalina
The only video filetype that can use alpha channel with Catalina is Apple Prores 4444