[Mp4-tech] Re: Mp4-tech Digest, Vol 34, Issue 15

[pankaj bajpai]

Dear Carter,
Ideally the increase in search range should give better PSNR
and Bitrate.
But it all depends on the ME that is implemented.
Depending upon the ME, sometimes, increased search range increases
the PSNR slightly, but also increase the Bitrate. This may happen
if the increase in bit resulted from coding longer motion vector 
is  not taken into account.
From: Carter <dv2 naver.com>
To: mp4-tech lists.mpegif.org
Subject: [MP4-tech] What is relationship among ME_SearchRange, PSNR and Bitrate?
Date: Thu, 18 May 2024 14:01:38 +0900 (KST)
Could you please help me?
Hi.
What is relationship among ME_SearchRange, PSNR and Bitrate?
If SearchRange is increase from 16x16 to 32x32, What happen to PSNR 
and Bitrate?
I think that PSNR(32x32 SearchRange) is well over PSNR(16x16 
SearchRange) and Bitrate(32x32 SearchRange) decrease than (16x16 
SearchRange).
I guess when SearchRange is 32x32, PSNR value is from 20.312 to 24.582
and Bitrate is from 300Kbps to 150Kbps.
cf, This experiment environment have occur at JM 10.2 decoder.
Is that Right?
Pankaj Kumar Bajpai
Mulitimedia Engineer
India
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