X264 encoding parameter big test: 07 subme and CRF (Summary)

I. Test content

 

Test Method --

X264 encoding parameter big test: Index stickers

Http://www.cnblogs.com/zyl910/archive/2011/12/14/x264_encode_param.html

 

Test parameter --

Subme: 9, 10, and 11. Sets the complexity of the subpixel motion estimation (motion estimation. The higher the value, the better.

CRF: 18 to 28, interval 1. The bitrate Control Method of the fixed bit rate coefficient (constant ratefactor. When QP uses a quantitative value as the target, while bitrate uses a file size as the target, CRF uses a "quality" as the target. The idea is to make CRF n provide the same visual quality as qp n, but the file is smaller. The unit of measurement for CRF values is "bit rate coefficient (ratefactor )".

Refer to the test: subme9, crf26.

 

Test video --

A (red): 720p animation fate/Zero 07. "Fate" for short ".

B (yellow): 720p animated hunter x hunter 07. Hxh for short ".

C (green): p animation my sister could not be so cute 11. "Oreimo" for short ".

F (Qing): 720p movie "need for speed 12: No storm" trailer. NFS for short ".

G (blue): 720p movie Transformers 3 trailer. "Tran3" for short ".

H (purple): 1080p movie coralreef.1080p (coral reef ). "Coral" for short ".

 

 

Ii. Test Results

 

This section compares and analyzes the test results of all videos, so the data volume is large.

If you think there are too many lines and want to view a single video chart, see --

Http://www.cnblogs.com/zyl910/archive/2011/12/14/x264_encode_param_01_subme_crf_a.html

Http://www.cnblogs.com/zyl910/archive/2011/12/15/x264_encode_param_02_subme_crf_ B .html

Http://www.cnblogs.com/zyl910/archive/2011/12/15/x264_encode_param_03_subme_crf_c.html

Http://www.cnblogs.com/zyl910/archive/2011/12/16/x264_encode_param_04_subme_crf_f.html

Http://www.cnblogs.com/zyl910/archive/2011/12/17/x264_encode_param_05_subme_crf_g.html

Http://www.cnblogs.com/zyl910/archive/2012/01/05/x264_encode_param_06_subme_crf_h.html

 

 

2.1 Image Quality

 

Dssim curve (the higher the better )--

 

Pssim curve (the higher the better )--

 

 

2.2 Bit Rate

 

Kbps curve (the lower the better )--

 

Compression Ratio Curve (lower, better )--

 

 

Transcoding speed: 2.3

 

FPS curve (the higher the better )--

 

PFPs curve (the higher the better )--

 

 

Iii. Summary

 

Compared with subme9, subme10 is more inclined to reduce the bit rate, resulting in a slight reduction in image quality and a decrease in transcoding speed.

Subme11 significantly reduced the transcoding speed again, but it was almost consistent with subme10 in terms of image quality and bit rate. Not recommended.

Rating --

1. subme10 is recommended for the compression rate.

2. subme9 is recommended for image quality.

 

Although CRF also affects the compression ratio and transcoding speed, we mainly control the image quality --

1. crf26 is recommended in the pursuit of compression ratio and low image quality requirements.

2. for image quality and low compression ratio requirements, crf18 or smaller is recommended.

3. In general, choose crf23. This is the default value of x264.