Function av_metrics::video::psnr::calculate_frame_psnr

pub fn calculate_frame_psnr<T: Pixel>(
    frame1: &FrameInfo<T>, 
    frame2: &FrameInfo<T>
) -> Result<PlanarMetrics, Box<dyn Error>>

Calculates the PSNR for two video frames. Higher is better.

PSNR is capped at 100 in order to avoid skewed statistics from e.g. all black frames, which would otherwise show a PSNR of infinity.