FFmpeg: Convert Variable Frame Rate (VFR) to Constant (CFR)
Convert a variable frame rate (VFR) video to constant frame rate (CFR) with FFmpeg. Use ffprobe to suspect VFR by comparing r_frame_rate and avg_frame_rate, then force CFR with -fps_mode cfr — the FFmpeg 8.x replacement for the deprecated -vsync cfr. Fixes the root cause of many sync issues.
June 30, 2026
