Forwarding to x265-devel I think our lambda tables need to be revisited
---------- Forwarded message ---------- From: <[email protected]> Date: Thu, Oct 10, 2013 at 4:59 AM Subject: coding efficieny comparision between and HM To: Steve Borho <[email protected]> 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 <[email protected]> 收件人：[email protected], Development for x265 <[email protected]> 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
cfg and psnr.rar
Description: application/rar-compressed
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