Function av_metrics::video::ssim::calculate_video_ssim

pub fn calculate_video_ssim<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 SSIM score between two videos. Higher is better.