Y4m
type header = {
width : int;
height : int;
rate : int * int;
chroma : Yuv.chroma;
range : Yuv.range;
}
val frame_bytes : header -> int
val of_string : string -> header * Movie.t
val to_string : ?chroma:Yuv.chroma -> ?range:Yuv.range -> rate:(int * int) -> Rgba_image.t list -> string