Function av_metrics::video::psnr::calculate_video_psnr

pub fn calculate_video_psnr<D: Decoder, F: Fn(usize) + Send>(
    decoder1: &mut D,
    decoder2: &mut D,
    frame_limit: Option<usize>,
    progress_callback: F
) -> Result<PlanarMetrics, Box<dyn Error>>

Calculates the PSNR for two videos. 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.