hoelee e6476e1d15 post(devops): every player stuttered on the same video — the file was blameless (EN+ZH) + og/banner ...

The converted HEVC stuttered in VLC, Chrome and on an iPad (offline) while the source played fine.
Container timing was perfect (5818/5818 frame intervals at exactly 0.040000 s, no dup/backward PTS,
ctts not flat) and a full decode printed nothing. Cross-decoder SSIM found the real defect: NVDEC's
legacy av1_cuvid wrapper returns frames from the wrong timestamps - 106 of 5819 frames, SSIM down to
0.330, deterministically, roughly every 30 frames - and the HEVC output was a faithful encode of those
wrong pictures (min 0.991 against the NVDEC decode, min 0.330 against a software decode). Fix is one
line (-hwaccel cuda -hwaccel_output_format cuda -c:v av1, verified 1.000000 over 1500 frames; vp9_cuvid
unaffected). Adds the content gate (structure AND pictures, defect-shaped thresholds) to the pipeline.

2026-10-08 04:52:04 +08:00

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