[x264-devel] Additional Option Recommanded: -noi-ntra-macroblock

[champ yen]

Dear All:
    I have modified x264 for some tests. I try to encode a P frame
without I-Macroblock. It improves significan performance. It is tested
on Foreman CIF sequence. The lower bitrate makes more difference (I
guess that it is because of encoding complexity).

   Since intra_cost is used for rate control. I simply keep the cost
of previous macroblock  for the encoding of next macroblock(It's a
rough implementation).

Tested Environment
Pentium M 1.4G(IBM X31)
MDK linux 10.2 RC

Commands:  ./x264 -B [bitrate=128, 256, 512] -o foreman_cif.m4v ~/foreman_

128kbps: 
org: 33.93fps, PSNR: Y 30.9 U 38.37 V 39.44 AVG 32.32 Global 31.93
Bitrate: 126.0kbps
new: 39.21fps, PSNR: Y 30.37 U 38.11 V 39.10 AVG 31.81 Global 31.32
Bitrate: 125.9kbps

256kbps:
org: 27.72fps, PSNR: Y 33.88 U 39.56 V 40.93 AVG 35.15 Global 34.77
Bitrate: 251.8kbps
new: 31.43fps, PSNR: Y 33.81 U 39.44 V 40.69 AVG 35.07 Global 34.78
Bitrate: 255.0kbps

512kbps:
org: 23.01fps, PSNR: Y 36.06 U 40.95 V 37.78 AVG 37.78 Global 37.35
Bitrate: 502.3kbps
new: 26.00fps, PSNR: Y 36.52 U40.63 V 42.35 AVG 37.62 Global 37.23
Bitrate: 507.06kbps

I'm working on fast coding mode decision, I will release the patch
when I finish it.

best regards

champ yen
==
Champ Yen
http://www.ccns.ncku.edu.tw/~champ/

-- 
This is the x264-devel mailing-list
To unsubscribe, go to: http://developers.videolan.org/lists.html