FFmpeg: Fix "height not divisible by 2" / "width not divisible by 2"
Fix the libx264 error "height not divisible by 2" (and the width version) caused by odd dimensions after scaling or cropping. Learn why yuv420p needs even width and height, and three runnable fixes: scale with trunc, scale=-2 to keep aspect ratio, and pad to the next even size.
June 27, 2026
