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Old 7th February 2008, 08:59   #7  |  Link
Dark Shikari
x264 developer
 
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Join Date: Sep 2005
Posts: 8,666
Quote:
Originally Posted by Don_Genaro View Post
I´ve been wondering the same thing for a while.

After observing several samples of high quality xvid encodes and then transcode them to h264 I´ve reach these values:

Resolution, Bitrate

512X384, 800
640X480, 1249
352X480, 687
352X240, 344
384X288, 450
720X480, 1405

I consider that bitrate to be very safe to transcode high quality material and retain it´s transparency.

Always using two passes and these settings:

--ref 5 --mixed-refs --no-fast-pskip --bframes 16 --b-pyramid --b-rdo --bime --weightb --direct auto --filter -2,-1 --subme 7 --trellis 2 --analyse all --8x8dct --threads auto --thread-input --progress --no-dct-decimate --no-psnr --no-ssim --output "output" "input" ("--me tesa" if you can or "--me umh")

...Or to transcode xvid material I found that CRF 21 is enough, sometimes even CRF 24, for lower quality xvids.
Those are definitely overkill settings... and moreso, --trellis 2 is actually known for its tendency to kill off fine detail.
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