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14th August 2018, 06:49 | #1 | Link |
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Join Date: Dec 2014
Posts: 2
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variables of x264 encodes filesizes
Hi all
I am backing up my whole DVD cartoon collection. While encoding all with same x264 settings I noticed that older cartoons (made before 1980) consistently end up with more substantial filesizes compared to more recent animation movies. What can explain this difference in encoding efficiency? Just wondering what is triggering these differences to maybe identify what can be changed to reduce the filesizes without substantial quality loss. Thanks |
28th August 2018, 18:44 | #4 | Link |
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Join Date: Jan 2006
Location: Portland, OR
Posts: 4,770
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Using x264's --nr is actually pretty good for this scenario, since it takes out exactly the noise that makes it harder to compress. Which, for anime, is pretty much the noise that wasn't in the original cels.
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29th August 2018, 21:24 | #5 | Link |
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Join Date: Oct 2016
Posts: 56
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Use nr has meaning only in the range of 100-300. The values are larger, not rational, compared to increasing crf.
for example, crf=20 nr=500 will be worse than crf=20.5 nr=0, with the same bitrate In some files, it is better to strengthen psy, keeping roughly the same bitrate crf=20 vs crf=21 psy=1.2:0.2 In this case, keeping the bitrate identical, we make the codec focus more on noise and fine detail changing (not removing) it for better compression. You can also apply them in a bundle crf=20 vs crf=21 nr=300 psy=1.2:0.2 This will help to reduce the bitrate, without significant deterioration of perception. Last edited by zub35; 29th August 2018 at 21:46. |
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