V1 - Video Compression Screening

Date: 2026-07-13. Source video: /local/scratch-2/fy277/temp/vdp_screening/input/cycle_view.mp4. Clip: 3.0s at 8 fps, 384x256. Embedded videos are H.264/yuv420p/faststart playback copies where needed.

1 - Metrics

Codec	CRF	Size MB	JOD	PSNR	SSIM	L1	LPIPS	Temporal p95	Heat p95
`av1`	18	0.2182	9.837	33.517	0.937	0.01548	0.0399	0.018578	0.0285
`av1`	24	0.1618	9.802	32.623	0.923	0.01706	0.0511	0.020889	0.0352
`av1`	32	0.0926	9.657	30.888	0.889	0.02057	0.0796	0.025616	0.0566
`av1`	40	0.0541	9.382	29.251	0.845	0.02443	0.1290	0.030174	0.0982
`av1`	48	0.0323	8.950	27.716	0.792	0.02875	0.1981	0.035088	0.1741
`h264`	18	0.3398	9.881	34.924	0.957	0.01318	0.0195	0.016450	0.0200
`h264`	24	0.1626	9.793	31.983	0.921	0.01818	0.0404	0.023387	0.0354
`h264`	32	0.0524	9.182	27.888	0.817	0.02833	0.1151	0.036125	0.1230
`h264`	40	0.0173	7.496	24.413	0.656	0.04112	0.3136	0.047495	0.4014
`h264`	48	0.0073	5.041	21.718	0.507	0.05580	0.5114	0.055065	0.8604
`h265`	18	0.3723	9.872	34.601	0.953	0.01369	0.0203	0.017220	0.0212
`h265`	24	0.1959	9.796	32.539	0.927	0.01714	0.0363	0.022188	0.0338
`h265`	32	0.0677	9.270	28.635	0.835	0.02613	0.1081	0.033271	0.1126
`h265`	40	0.0203	7.827	24.915	0.682	0.03925	0.2821	0.045905	0.3698
`h265`	48	0.0074	5.450	21.841	0.519	0.05573	0.5163	0.055834	0.8415

2 - Videos

Reference clip

h264 CRF 18 browser playback

h264 CRF 32 browser playback

h264 CRF 48 browser playback

h265 CRF 18 browser playback

h265 CRF 32 browser playback

h265 CRF 48 browser playback

av1 CRF 18 browser playback

av1 CRF 32 browser playback

av1 CRF 48 browser playback

3 - Verdict

Cycle-view compression sweep. H.264/H.265/AV1 are evaluated against the same 3-second reference clip. The embedded videos use H.264 playback copies for browser compatibility; metrics are computed on the actual encoded codec outputs.

4 - Config

{
  "source_video": "/local/scratch-2/fy277/temp/vdp_screening/input/cycle_view.mp4",
  "work_dir": "/local/scratch-2/fy277/temp/vdp_screening/work/v1_v4_cycle_view_20260713",
  "v1_report": "/local/scratch-2/fy277/temp/vdp_screening/reports/v1_compression_2026-07-12_cycle_view_new",
  "v4_report": "/local/scratch-2/fy277/temp/vdp_screening/reports/v4_flicker_removal_2026-07-12_cycle_view_new",
  "seconds": 3.0,
  "start": 0.0,
  "fps": 8,
  "width": 384,
  "v4_iters": 200,
  "only": "all",
  "height": 256,
  "frames": 24
}