[XviD-devel] GMC! It's there (well... it's HERE)

[Christoph Lampert]

Hooray,

this is my very first (bugfree) GMC result, and it's positive!!!

I tested foreman.cif (352x288) with 800kbps (-> low quant )

Reference: only halfpel 

br 0800 ( 0.316 bpp) size 4042 ( 808 kbps / 0.319 bpp) 
enc:  126.3 fps,
dec:  281.7 fps,
PSNR P(298): 25.75 ( 1798 , 4009 ;  9006 )


New: halfpel + GMC with 2 warp points and 16th-pel resolution

br 0800 (0.316 bpp) size 4043 ( 808 kbps / 0.319 bpp) 
enc:  60.8 fps, 
dec:  87.5 fps, 
PSNR P(298): 25.88 ( 1317 , 4005 ;  9082 )


So GMC has an advantage of 0.13 dB at same bitrate. 
For fixed quant, filesize is much larger... :(

However, for low bitrate / high quant PSNR is vice versa,
worse for GMC, and also, maybe it's all completely wrong, because 
it's my first test. 



But with this triumph I'll close the case for today and continue
tomorrow...

gruel