Two‑Pass vs CRF: Target Size vs Constant Quality
Updated: 12/13/2025
Two‑Pass vs CRF
CRF
Constant quality
Size varies by content
Simple to use
Two‑Pass
Predict file size
Better for strict limits
More encode time
Recommendation
Use CRF for general delivery
Two‑pass for tight size constraints
Combine with proper presets
Related articles
- H.264/H.265/AV1 Parameter Tuning for Practical CompressionA hands‑on overview of key parameters across H.264, H.265 (HEVC), and AV1, with compatibility tips, bitrate controls, and example recipes aligned with Vibbit workflows.CompressionCodecH.264H.265AV1
- CRF Basics: Picking the Right Quality LevelUnderstand Constant Rate Factor (CRF), typical ranges and trade‑offs.CompressionCRFQuality
- PSNR/SSIM Metrics and Subjective Quality: How to Use ThemExplain what PSNR and SSIM measure, why they can disagree with perception, and how to combine metric checks with human review to make solid compression decisions for Vibbit workflows.CompressionQualityPSNRSSIMEvaluation
- Bitrate Guide for 720p and 1080pRecommended bitrates by resolution and use case.CompressionBitrateResolution