Mobile/PDA About Us Advertise here
User User name Password  
  Not registered yet? Register here.
Lost your password? Click here. 		 
  Home   News   Guides   Downloads   Glossary   Hardware   Profiles   Forums   v4  
 Advertise at AfterDawn.com     Link to us!     Private messages     Compose a private message     List of all updated threads     Threads without replies     Search messages
Tuesday 21.1.2025 / 09:03
Search AfterDawn Forums:        In English   Suomeksi   På svenska
afterdawn.com > forums > software specific discussion > dvd / bd-rebuilder forum > what's the correct decoder idct for my system?
Show topics
 
Forums
Forums
What's the correct decoder iDCT for my system?
  Jump to:
 
Posted Message
hermes_vb
Senior Member
_ 		7. January 2006 @ 11:29 _ Link to this message    Send private message to this user   
I have a Pentium M 1.60 GHz laptop computer and don't know which one of the seven options is best. So far I have left it at Default...
[ + quote]
If I always hear voices surrounding me, does it mean Im crazy or that I hear in Dolby 5.1?

Advertisement
_ 		__
L8ter
Suspended permanently
_ 		11. January 2006 @ 04:48 _ Link to this message    Send private message to this user   
concerning idct settings experimenting is usually reccomended!

the default is what I've come to use (just lazziness) but the 32simplemmx (xvid) is said to be quite fast and precise!

just but don't hesitate to try them out and decide what gives you the best speed!
[ + quote]
hermes_vb
Senior Member
_ 		11. January 2006 @ 06:31 _ Link to this message    Send private message to this user   
So it's basically a speed thing?
[ + quote]
If I always hear voices surrounding me, does it mean Im crazy or that I hear in Dolby 5.1?

L8ter
Suspended permanently
_ 		11. January 2006 @ 06:41 _ Link to this message    Send private message to this user   
this is the main use of the settings the precision of the decode is what's @ stake but I have yet to have read any complaints related to experimenting w/ them!

it breaks down the source w/ different access points so to speak but the result is largely minuscule especially to the human eye!

the noticable result is speed depending on how well your system handles each setting

you can dl pc wizard 2005 or similar app to identify your processors capabilities but the unsupported processes will be noticably slower!

[ + quote]
UncasMS_3
Member
_ 		12. January 2006 @ 15:18 _ Link to this message    Send private message to this user   
imho speed is the main issue you're dealing with

i wasnt able to see differences when using 64bit idtc

in case you're interested in the speed difference i have tested all idct's: http://forum.digital-digest.com/showthread.php?t=55813
[ + quote]
brobear
Suspended permanently
_ 		16. January 2006 @ 19:10 _ Link to this message    Send private message to this user   
Multimedia Instruction: MMX, SSE, SSE2

That is part of the specs I picked off a Pentium M listing. As the category states, those are the multimedia capabilities built into the processor. Some newer systems use SSE3, and 3DNow!Professional. So, set the IDCT settings according to the multimedia specs of your processor, that or leave it at default. I'd suggest the 32 Bit SSE2/MMX setting. That's what I have my system set to as my processor has the same Multimedia Instruction specs.

Of interest from the UncasMS post was:

according to rockas the default settings is:

Quote:
... the default value is SSE/MMX not SSE2/MMX... anyway...
SSE2/MMX is compatible with Pentium IV and AMD64...
SSE/MMX is compatible with those two plus Pentium III and Amd ATHLON.


jdobbs on: 32 bit ssemmx idct (skal):

Quote:
The two SSE/MMX versions are just different algorithms that use the same precision levels, one was designed by SKAL.

[ + quote]
'Brobear'





I was an earth-rim walker, a lurker at the threshold of the abyss. - Grendel -

This message has been edited since posting. Last time this message was edited on 16. January 2006 @ 19:25
UncasMS_3
Member
_ 		19. January 2006 @ 07:52 _ Link to this message    Send private message to this user   
take care with rebuilder pro 1.06 and idct

due to changing from dgdecode 1.1 to 1.45 there appeared little flaws with the addressed idcts

3,4 and 5 should not be used atm
[ + quote]

This message has been edited since posting. Last time this message was edited on 19. January 2006 @ 07:53
brobear
Suspended permanently
_ 		19. January 2006 @ 09:10 _ Link to this message    Send private message to this user   
What little flaws are you referring to?
[ + quote]
'Brobear'





I was an earth-rim walker, a lurker at the threshold of the abyss. - Grendel -
UncasMS_3
Member
_ 		19. January 2006 @ 12:54 _ Link to this message    Send private message to this user   
wrongly addressed idcts due to switching from dgdecode 1.1 => 1.45

this is what fishman0919posted @ d9
Quote:
DGDecode 1.10 DGDecode 1.45
------------- -------------
1. 32 Bit MMX 32 Bit MMX
2. 32 Bit SSE/MMX 32 Bit SSE/MMX
3. 64 Bit Floating Point 32 Bit SSE2/MMX
4. 64 Bit IEEE-1180 Ref 64 Bit Floating Point
5. 32 Bit SSE2/MMX 64 Bit IEEE-1180 Ref (Fixed)
6. 32 Bit SSE/MMX (Skal) 32 Bit SSE/MMX (Skal)
7. 32 Bit Simple MMX (XviD) 32 Bit Simple MMX (XviD)
++++++
crappy forum software
c.f. here:
http://forum.doom9.org/showthread.php?p=769924#post769924
[ + quote]

This message has been edited since posting. Last time this message was edited on 19. January 2006 @ 12:55
Advertisement
_ 		__
 
_
brobear
Suspended permanently
_ 		19. January 2006 @ 13:27 _ Link to this message    Send private message to this user   
Quote:
No. It will work correctly and you will use the correct iDCT algorithm. The ones affected are also the ones rarely used because they are so slow.

I'm still trying to figure out why they were changed at all...

This is truly much ado about nothing. -jdobbs-
All one normally will see is some speed variation, nothing to fear, or at least that's the impression of the author. I suspect we'll see an update shortly. I ran some batch encodes and the videos came out good and I was set to 32 bit SSE2.

[ + quote]
'Brobear'





I was an earth-rim walker, a lurker at the threshold of the abyss. - Grendel -

This message has been edited since posting. Last time this message was edited on 19. January 2006 @ 13:29
afterdawn.com > forums > software specific discussion > dvd / bd-rebuilder forum > what's the correct decoder idct for my system?
 

Digital video: AfterDawn.com | AfterDawn Forums
Music: MP3Lizard.com
Gaming: Blasteroids.com | Blasteroids Forums | Compare game prices
Software: Software downloads
Blogs: User profile pages
RSS feeds: AfterDawn.com News | Software updates | AfterDawn Forums
International: AfterDawn in Finnish | AfterDawn in Swedish | AfterDawn in Norwegian | download.fi
Navigate: Search | Site map
About us: About AfterDawn Ltd | Advertise on our sites | Rules, Restrictions, Legal disclaimer & Privacy policy
Contact us: Send feedback | Contact our media sales team
 
  © 1999-2025 by AfterDawn Ltd.

  IDG TechNetwork