[x265] Fwd: coding efficieny comparision between and HM

[Steve Borho]

Forwarding to x265-devel

I think our lambda tables need to be revisited

---------- Forwarded message ----------
From: <idxa at sina.com>
Date: Thu, Oct 10, 2013 at 4:59 AM
Subject: coding efficieny comparision between and HM
To: Steve Borho <steve at borho.org>


Hi Steve,
I have done a futher test to compare x265 with HM11.0.

*1. Modify HM's configuration(LP-Main) like that:*
#======== Coding Structure =============
IntraPeriod                   : -1          # Period of I-Frame ( -1 = only
first)
DecodingRefreshType           : 0           # Random Accesss 0:none, 1:CDR,
2:IDR
GOPSize                       : 1           # GOP Size (number of B slice =
GOPSize-1)
#        Type POC QPoffset QPfactor tcOffsetDiv2 betaOffsetDiv2
temporal_id #ref_pics_active #ref_pics reference pictures predict deltaRPS
#ref_idcs reference idcs
Frame1:  P    1   0        0.4624   0            0
0           1                1         -1                 0

Here, GOPSize=1, QPoffset=0, QPfactor=0.4624(make constant lamda like
x265), ref=1, all P frames.

*2.x265 options:
*x265.exe  --input source\test_party_10s.yuv -o output\test_party_x265.hevc
--recon output\test_party_x265_recon_38.yuv --fps 25 --input-res 640x360
--qp 38 -F 4 --bframes 0 --b-adapt 0 --log 3

Here, --bframes 0, --b-adapt 0 guarantee all P frames, and default ref =
1. The target is to make  parameters of HM and x265 very similar. In x265
"--qp" is adjusted to make the two encoder have same size output encoded
files.

The tool of MSU Video Quality Measure is used to calculate the PSNR.

*Test result:*
x265:
Bitrate:848.2kbps, PSNR:27.998

HM11.0:
Bitrate:866.8kbps, PSNR:28.992


The difference is very big(about 1dB).
Do you have ftp server and I can send the video clips to you. The
attachments are HM configuration file and PSNR result file.

Thanks,
idxa

 ----- 原始邮件 -----
发件人：Steve Borho <steve at borho.org>
收件人：idxa at sina.com, Development for x265 <x265-devel at videolan.org>
主题：Re: [x265] coding efficieny comparision between x265 and x264(also
include HM)
日期：2013年10月02日 03点08分




-- 
Steve Borho
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