why you said 18 to 20 crf for standard ??? and 20 to 23 for hd ?? non sence!!

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killerpot
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why you said 18 to 20 crf for standard ??? and 20 to 23 for hd ?? non sence!!

Post by killerpot » Thu Sep 06, 2018 7:10 pm

Description of problem or question:

if 18 to 20 are better in crf why you said to put that for standard definition instead of 20 to 23 for standard?? because of grain and lower quality ?

18 to 20 suposed to be better quality so why not using it for hd and not standard! https://i.imgur.com/xX2MQzF.gifv like showing here thx for reply!


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JohnAStebbins
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Re: why you said 18 to 20 crf for standard ??? and 20 to 23 for hd ?? non sence!!

Post by JohnAStebbins » Thu Sep 06, 2018 8:07 pm

For SD content, you are starting out with a low quality source. If you want to refrain from degrading much further, you use a lower RF.

For HD content, you could apply the same logic as above. I.e. "you want to refrain from degrading it much further". But this is overkill for the vast majority of people. The original quality of HD sources is often more than adequate for most peoples viewing environments and it is OK to allow a bit more loss during the encoding process in order to achieve smaller file sizes.

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BradleyS
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Re: why you said 18 to 20 crf for standard ??? and 20 to 23 for hd ?? non sence!!

Post by BradleyS » Sat Sep 08, 2018 12:43 am

Additionally, SD sources are typically viewed on HD or higher displays, magnifying imperfections. So it's necessary to use a lower RF to avoid introducing artifacts that will be more noticeable in this case.

Rate Factor is not an absolute quality metric. It's more like quality-per-pixel. So the output resolution is an important factor in what RF range is acceptable.

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