Yadongparty video quality comparison | 2026-10-25

Source: FFmpeg testsrc2 (synthetic moving test pattern), not footage from an external service.
Duration: 6 seconds; 30 fps; 180 frames; 1920x1080; no audio.
Reference: FFV1, yuv420p.
Encoder: libx264, medium, two passes, GOP 60, scenecut=0, threads=2.
Conditions: height 720/1080 x target bitrate 300k/1500k (decimal kb/s).
Measured file_average_kbps = exact MP4 file bytes * 8 / 6 / 1000, including container overhead.
All decoded outputs resized to 1920x1080 using Lanczos before FFmpeg SSIM All. Both inputs use time base 1/30 and frame-index PTS. Stop at the shortest input and disable final-frame repetition; each comparison log contains exactly 180 records.
The published SSIM is the complete 180-frame average, not a selected-frame result.
Stills: zero-based frame n=90 (3.000 seconds), crop x=1216,y=704,w=320,h=192.
Crops are lossless WebP. No sharpening or additional contrast adjustment.
SSIM is a structural comparison metric, not a viewer satisfaction percentage.
This single synthetic scene does not measure network speed, mobile playback or external websites.
No recommended universal streaming bitrate is implied.

Tool: ffmpeg version 7.1-essentials_build-www.gyan.dev Copyright (c) 2000-2024 the FFmpeg developers

Reproduce with FFmpeg:
ffmpeg -f lavfi -i "testsrc2=duration=6:size=1920x1080:rate=30" -an -c:v ffv1 -threads 2 -pix_fmt yuv420p reference.mkv

For each H in 720,1080 and R in 300,1500, substitute the numeric values below.
Use a distinct PASSLOG prefix for each pair. NUL is the null device on Windows; use /dev/null on Unix.
ffmpeg -i reference.mkv -an -vf "scale=-2:H:flags=lanczos" -c:v libx264 -preset medium -b:v Rk -g 60 -pix_fmt yuv420p -threads 2 -passlogfile PASSLOG -x264-params scenecut=0 -pass 1 -f null NUL
ffmpeg -i reference.mkv -an -vf "scale=-2:H:flags=lanczos" -c:v libx264 -preset medium -b:v Rk -g 60 -pix_fmt yuv420p -threads 2 -passlogfile PASSLOG -x264-params scenecut=0 -pass 2 -movflags +faststart OUTPUT.mp4
ffmpeg -i OUTPUT.mp4 -i reference.mkv -filter_complex "[0:v]scale=1920:1080:flags=lanczos,settb=1/30,setpts=N[dist];[1:v]settb=1/30,setpts=N[ref];[dist][ref]ssim=shortest=1:repeatlast=0" -an -f null NUL

Output filenames, exact sizes, average rates, SSIM and SHA-256 checksums are in measurements.csv.