hoelee 541b00c958 post(tutorials): does re-encoding to HEVC actually shrink your files? I measured it (EN+ZH) + og/banner ...

Measured on real files with quality held fixed (SSIM vs the source, harness self-tested at 1.0000):
hevc_nvenc cq27 produced 115% and 119% of the source video bitrate on two of three files while cq30/31
landed 51-84%; libx265 crf26 landed 33.7/56.7/67.0% at min SSIM 0.988-0.993, i.e. 10-22% smaller than
NVENC at matched quality. Two sources with identical bpp (0.0437) shrank 49% vs 17%, so bpp classifies
files but does not predict the ratio. Notes the audio floor (a 33.7% video stream still yields a 53%
file because AAC dominates what is left) and why VP9/AV1 sources have no headroom (copy the video).

2026-10-08 05:19:27 +08:00

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post(tutorials): does re-encoding to HEVC actually shrink your files? I measured it (EN+ZH) + og/banner

2026-10-08 05:19:27 +08:00

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post(tutorials): does re-encoding to HEVC actually shrink your files? I measured it (EN+ZH) + og/banner

2026-10-08 05:19:27 +08:00

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