pub fn downscale_frame(
frame: &DecodedVideoFrame,
factor: u32,
) -> Result<DecodedVideoFrame, String>Expand description
The frame shrunk by factor (2 for half size, 4 for quarter), each output
sample the mean of the factor x factor block it covers, the visible
size rounded down to even numbers so 4:2:0 encoders take it.
ยงErrors
Returns a message for a factor below 2, a frame too small to shrink, or a plane shorter than its layout.