View Single Post
Old 20th January 2019, 05:50   #16  |  Link
lansing
Registered User
 
Join Date: Sep 2006
Posts: 1,657
So I finally have time to play with this plugin, it's very good tool to help find optimal encode settings for my contents.

My test clip is a 1000 frames of 1440x1080 anime with no grain and very little motion. Here are the comparison between x264 and x265 I made with vmaf :

Code:
                                   Aggregate VMAF Percentage
source                                   98.8374

x264 300 kb/s medium animation           79.9185
x265 300 kb/s medium                     85.6454
x265 300 kb/s slower                     86.9443

x264 2500 kb/s medium animation          95.1616
x265 2500 kb/s medium                    94.9675

x264 CRF 25 medium animation             91.3914
x265 CRF 25 medium                       91.1363

x264 CRF 18 medium animation             96.1513
x265 CRF 21 medium                       93.6972

x264 CRF 18 medium animation             96.1513
x264 CRF 18 slower animation             96.3279
According to the FAQ, comparing the source clip to itself won't gives 100% score, so 98.8% here is the highest quality for this clip.

For encoding in low bitrate, x265 clearly wins. But for high/transparent encoding, it seems that x264 is still better if encode in same bitrate or same CRF. I don't have good 4k contents to see how that goes.

I have heard people said that x264 crf 18 is equivalent to x265 crf 21 so I did a comparison on those too, and the score shows that there is a difference.

On the last comparison I did it between two different presets. So with high bitrate encoding for my content, using slower preset is just a waste of time with insignificant amount of gains. It only make sense to use it on low bitrate encodes.
lansing is offline