[Request] Option to set the aspect ratio flag inside the AVI info frame

[capriots]

My TV (Sony K65XR70) does not allow manually changing the aspect ratio. Instead, it uses whatever the aspect ratio flag is set to inside the AVI info frame (with 0 being treated as PAR 1:1). Since the aspect ratio flag is currently hardcoded to 0, my TV always uses square pixels for everything. It would be great if you could add an option to set the flag.