PDA

View Full Version : What P4 optimizations?

Stereodude
29th December 2002, 20:59
I have a P4 running at 2970Mhz and I've tried both the p4 optimized version and the regular one and to be honest I can't tell any differences between them.

Is there a list of what's enhanced/different between the two? I would think that P4 optimizations should cause a noticable speed boost, but I can't say that I've noticed one.

Stereodude
cofferscuffs
29th December 2002, 23:13
Build 14303 (Version 1.4.12): [November 23, 2002]
[features added]
* Parts of the MPEG-1 decoder, some color conversion
functions, and parts of the resize filter have been
optimized for SSE2 (Pentium 4).
colordog
2nd January 2003, 02:38
I've run non-P4 v. P4-optimized, and I saw what turned out to be a 2% speed increase, roughly. Yeah, it's a lot less than I expected too, but it turns out that most of these guys are already highly optimized. (I've got other posts somewhere about that). With my P4 system, I can encode a movie (128kbps MP3 audio, ~512 horizontal, no field, two pass DivX 5.0.2 pro on on off light) at about 0.9x, so that's pretty cool with me. (Used to be about 0.25x before I upgraded). Probably after the new Avisynth 2.5 / YV12 stuff gets 'dumbed down' enough for me to use with GKnot someday, we'll be able to encode faster than 1x with two passing.
Trahald
2nd January 2003, 04:37
the only optimization that would effect most encoding is the resize filter enhancements. and thats only if you always use vdubs resizer (if you use the resizing in the avs it wouldnt have an effect) if you are using fast recompress then the color space conversion optimizations wouldnt have any effect either (and very little if you do full processing)
Stereodude
2nd January 2003, 12:37
Originally posted by w00kiee
the only optimization that would effect most encoding is the resize filter enhancements. and thats only if you always use vdubs resizer (if you use the resizing in the avs it wouldnt have an effect) if you are using fast recompress then the color space conversion optimizations wouldnt have any effect either (and very little if you do full processing) I do my resizing in Vdub. Still didn't notice much difference. Oh well, I'll take any speed boost I can get.

Stereodude