viser-quality

VMAF, PSNR, SSIM, SSIMULACRA2, and butteraugli quality measurement. VMAF/PSNR/SSIM use FFmpeg's libvmaf filter; SSIMULACRA2 and butteraugli run their respective CLI tools on extracted PNG frames.

Key Types

• Metric — quality metric variant (Vmaf, Psnr, Ssim, Ssimulacra2, Butteraugli)
• MeasureOpts — measurement options (metrics, subsample, VMAF model, per-frame flag)
• Result — aggregate scores with optional per-frame data

Key Functions

• measure(reference, distorted, opts) — computes quality between reference and distorted video

Prerequisites

• VMAF/PSNR/SSIM: ffmpeg compiled with --enable-libvmaf
• SSIMULACRA2: ssimulacra2 binary on $PATH
• Butteraugli: butteraugli binary on $PATH (missing binary degrades gracefully to 0.0)