










悲剧
For this source (SD resolution) I obtained the following results with sane settings ref 4, umh, b-frames 3, merange 16:
--threads 3 requires +0.2% bitrate comparing to --threads 1.
--threads 6 requires +0.35% bitrate comparing to --threads 1.
--threads 12 requires +0.75-0.80% bitrate comparing to --threads 1.
The difference is less than 1%. It's impossible to say which is better even on screenshots.
But if you need a meaningless ideal quality and wait 16 or 32 hours instead of 8 hours...
More probably they don't forget. --threads 3 has no any quality impact for HD 720p/1080p.
Just checked for blu sky 1080p sample:
Results:
--threads 1 SSIM: 79.835 OPSNR: 38.248 (6002.4 kbit/s)
--threads 3 SSIM: 79.840 OPSNR: 38.246 (5979.66 kbit/s)
No quality loss at all.
--threads 3 requires +0.2% bitrate comparing to --threads 1.
--threads 6 requires +0.35% bitrate comparing to --threads 1.
--threads 12 requires +0.75-0.80% bitrate comparing to --threads 1.

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