[Mp4-tech] Why I or B frame can have one fixed QP?

[Gary Sullivan]

I don't think it's true that an I or B frame can only have one fixed QP value in the JM reference software.  No, there is no requirement of fixed QP in the standard.  QP can change (from any value to any other value) on a macroblock (16x16) basis in the standard.
Best Regards,
Gary Sullivan
________________________________
	From: mp4-tech-bounces lists.mpegif.org [mailto:mp4-tech-bounces lists.mpegif.org] On Behalf Of James (Jianpeng) Dong
	Sent: Friday, May 05, 2024 4:43 PM
	To: mp4-tech-bounces lists.mpegif.org; mp4-tech lists.mpegif.org
	Cc: jianpengdong yahoo.com
	Subject: [Mp4-tech] Why I or B frame can have one fixed QP?
	Dear experts, 
	Just wondering why I or B frame can only have one fixed QP in H.264 JM reference software? Is a fixed QP required by H.264/AVC standard? 
	Thanks,
	James
________________________________
	Yahoo! Messenger with Voice. Make PC-to-Phone Calls <http://us.rd.yahoo.com/mail_us/taglines/postman1/*http://us.rd.yahoo.com/evt=39663/*http://voice.yahoo.com>  to the US (and 30+ countries) for 2¢/min or less.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: /pipermail/mp4-tech/attachments/20060506/de12789c/attachment.html