[XviD-devel] hq ac prediction mode

[Christoph Lampert]

On Sun, 9 Feb 2003, suxen_drol wrote:

> 
> hi,
> 
> i implemented a new ac prediction calculation method, which considers
> actual coefficient cost (bits), as ooposed to the present coeff sum
> method. it reduces file sizes a little, though nothing significant.
> 
> 640x256, 500 consecutive i-frames
> 	|		b	y	t	e	s
> quant	|	coeff		bitstrema	saving
> 	|	sum		sum
> --------+------------------------------------------------------
> q=2	|	8,105,984	7,938,048	167,936	(2.07%)
> q=3	|	5,941,248	5,814,272	126,976	(2.14%)
> q=4	|	4,812,800	4,718,592	94,208	(1.96%)
> q=8	|	2,865,152	2,813,952	51,200	(1.79%)
> 
> 
> 640x256, 500 frames (~10 i-frames, 490 p-frames)
> 	|		bytes
> quant	|	coeff		bitstrema
> 	|	sum		sum
> --------+---------------------------------
> q=2	|	2,187,264	2,183,168
> q=3	|	1,519,616	1,515,520
> q=4	|	1,105,920	1,103,872
> q=8	|	561,152		559,104
> 
> should i clean it up with a XVID_HQACPRED flag, and commit?

Sure... how was speed? 

gruel