id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc
1258	Encoder Description + HM : Low PSNR value for Y compared to U and V	anujagg85		"Hi All,

I tried the HM encoder to encode a raw YUV 720p seq using 8Mbps bit rate control and 2nd time using QP as 32 without rate control. But in both cases the Y PSNR is low compared to U and V PSNR. Even after using Cb and Cr QP offset of 5 results were same.

Results:

Bitrate: 8Mpbs
SUMMARY --------------------------------------------------------
Total Frames | Bitrate Y-PSNR U-PSNR V-PSNR 
91 a 8711.4251 30.4983 38.6517 40.0192

QP: 32.00
SUMMARY --------------------------------------------------------
Total Frames | Bitrate Y-PSNR U-PSNR V-PSNR 
91 a 8315.6097 29.6090 36.6231 39.1702

Can someone please suggest how to achieve higher Y PSNR compared to U and V ."	task	closed	minor		HM	HM-13.0	wontfix	PSNR	fbossen ksuehring davidf jct-vc@…