I wish to keep the grain of the source when I convert to h264. I can do this, but the bitrate required is ridiculous. There were older experimental versions of x264 around which had "keep grain" switches but I can't figure out how this is accomplished in the newer builds.
Yucky Poo
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"Quality is cool, but don't forget... Content is King!"
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Grain acts like noise , and requires a higher bitrate
psy-trellis and psy-rd are the switches that enchance grain. For example
--psy-rd 1.1:0.5 would mean 1.1 for psy-rd and 0.5 for psy-trellis
The new preset system has a grain retention setting --tune grain for heavy grain sources. These are the settings when activated:
Optimize for grainy content: deblock -2:-2, psy-rd 1:0.25, no-dct-decimate, ipratio 1.1, pbratio 1.1, aq-strength 0.5, deadzone-intra 6, deadzone-inter 6, qcomp 0.8 -
Thanks PDR, I'll give it a shot
"Quality is cool, but don't forget... Content is King!" -
Bumping up qcomp will probably keep more grain and fine detail, but it comes at a high bitrate cost. 0.7 is about as high as is comfortable for me. Increasing it weakens mbtree strength, since it moves closer to constant-quantizer encoding (which is qcomp=1.0).
Also, pbratio shouldn't have any effect when mbtree is enabled, so I wonder why it's set in that grain tuning.
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