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Old 18th November 2013, 13:21   #8  |  Link
nm
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Join Date: Mar 2005
Location: Finland
Posts: 2,641
Quote:
Originally Posted by xkfz007 View Post
@nm
I have tried about 25 sequences. Also 300 frames are used. For some sequences, the difference is about 1~3%,but for several sequences it is about 10%, even 15%.
About --ratetol, I have tried too. Indeed, it will improve the accuracy, leading to bad quality. About the accuracy, owing to the low delay of my application, it is unacceptable to converge after about 3000 frames(60s @fps=50).
If you can't lower the target bitrate by 10% or 15% to compensate, sounds like you want CBR.


Quote:
Originally Posted by xkfz007 View Post
The current ABR in x264 only used on Frame level, and when MB level is considered, the vbv-related params should be set. So I want to adjust the QP of each MB based on the QP decided by ABR in Frame level.
Sorry, I'm not quite following you here. How exactly do you want to change the way macroblock QPs are decided? Why wouldn't you use VBV parameters?

Last edited by nm; 18th November 2013 at 13:23.
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