Quantcast KVCD: Mpeg2dec2 or MPEG2DEC3? - digitalFAQ.com Forums [Archives]
  #1  
06-19-2003, 06:52 PM
audi2honda audi2honda is offline
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I've been reading that Tom Barry's mpeg2dec2 is faster for Pentium 4 processors, but I see kwag's script useds Mark's Mpeg2Dec3.

Is there a quality or feature difference between these? I have a P4 so I'd like to take advantage of it.

Thanks
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06-19-2003, 07:17 PM
audi2honda audi2honda is offline
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I guess a better question is does anyone use this option "idct=5"

example:
Mpeg2Source("D:\Projects\project.d2v",idct=5)

The documentation for Mpeg2Dec3 says this is faster for P4 machines. I notice Kwag doesn't use it even though he has a P4. I don't really understand this setting and am curious if there is a quality impact by using this and if anyone has actually noticed faster frameserving and overall reduced encode time with this option.
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  #3  
06-19-2003, 07:32 PM
kwag kwag is offline
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Hi audi2honda,

I hadn't paid attention to that
I guess I'll have to run a clip with and without that option, to see how it impacts speed and/or quality

-kwag
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06-19-2003, 07:38 PM
kwag kwag is offline
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Done
Results are identical in both file size and speed. Did a 30 second clip, and there was no difference.

-kwag
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  #5  
06-19-2003, 09:14 PM
audi2honda audi2honda is offline
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what version of mpeg2dec3 do you have? a new version with optimized code was just released about a week ago.
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  #6  
06-19-2003, 09:29 PM
kwag kwag is offline
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Quote:
Originally Posted by audi2honda
what version of mpeg2dec3 do you have? a new version with optimized code was just released about a week ago.
Version 1.00, 5/20/2003.

Edit: The date is when I downloaded it. Do you have a newer version

-kwag
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06-19-2003, 09:31 PM
audi2honda audi2honda is offline
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Give this one a try. You have to set idct=5 in your .d2v file and in your .avs script after the mpegsource call like I put in that simple example above. Let me know if you notice any performance. I'm playing with it too.

http://forum.doom9.org/showthread.ph...ght=idct+speed
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  #8  
06-19-2003, 09:34 PM
jorel jorel is offline
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Quote:
Originally Posted by kwag
Quote:
Originally Posted by audi2honda
what version of mpeg2dec3 do you have? a new version with optimized code was just released about a week ago.
Version 1.00, 5/20/2003.

Edit: The date is when I downloaded it. Do you have a newer version

-kwag
last from nic v1.08:
http://nic.dnsalias.com/

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  #9  
06-19-2003, 09:36 PM
kwag kwag is offline
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Ok, same result with 1.08. No diff with or without "idct=5"

As: Mpeg2Source("F:\KPAX\VIDEO_TS\movie.d2v")
Or : Mpeg2Source("F:\KPAX\VIDEO_TS\movie.d2v", idct=5 )

-kwag
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  #10  
06-19-2003, 09:39 PM
audi2honda audi2honda is offline
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oh well worth a try
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  #11  
06-19-2003, 09:41 PM
kwag kwag is offline
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Maybe on a higher end P4 (2.4+Ghz) there's a difference. Mine is a poor 1.6Ghz CPU

-kwag
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  #12  
06-19-2003, 09:48 PM
dazedconfused dazedconfused is offline
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This is a bit off-topic, but just thought I'd add that there definetly IS a noticeable speed increase if you have a P4 processor and use "idct=5" in your .d2v while using MPEG2DEC2 in Avisynth 2.08. I guess MPEG2DEC3 must need a bit more optimizing.

-d&c
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  #13  
06-19-2003, 09:49 PM
audi2honda audi2honda is offline
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i'm going to try it now. Kwag did you put it in your .d2v file also?
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  #14  
06-19-2003, 09:53 PM
kwag kwag is offline
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Quote:
Originally Posted by audi2honda
i'm going to try it now. Kwag did you put it in your .d2v file also?
No , only in the .avs

-kwag
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  #15  
06-19-2003, 10:09 PM
dazedconfused dazedconfused is offline
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Just ran a short sampler encode with idct=4 vs idct=5 in Avinsynth 2.08 with MPEG2DEC2 to verify my previous statement :

time with idct=4 in .d2v was 3:25
time with idct=5 in .d2v was 3:05

that's with a P4 2.26Ghz, btw.

It's a pity if the same speed boost doesn't ring true for MPEG2DEC3.

-d&c
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  #16  
06-19-2003, 10:14 PM
kwag kwag is offline
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Then what about MPEG2DEC2 vs. MPEG2DEC3 comparison both on 2.52

-kwag
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  #17  
06-19-2003, 10:17 PM
audi2honda audi2honda is offline
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I'm running some tests with mpeg2dec3 and will have results in about 10 minutes. THen I'll use mpeg2dec2
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  #18  
06-19-2003, 10:28 PM
kwag kwag is offline
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I'm creating a new project file with DVD2AVI 1.77.3 to compare against the one I have, which was done with DVD2AVI 1.76.

-kwag
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  #19  
06-19-2003, 10:36 PM
kwag kwag is offline
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Well, I see no diff with my CPU. I just tested with DVD2AVI 1.77.3, and verified the project file. It's using SSE-2,MMX. Here's the line:
iDCT_Algorithm=5 (1:MMX 2:SSEMMX 3:FPU 4:REF 5:SSE2MMX)
Maybe my P(iss)4 CPU being 1.6Ghz, it's not good enough to see a difference

-kwag
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06-19-2003, 10:38 PM
audi2honda audi2honda is offline
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I don't see any difference either. I ran a few times and there was no difference between the plugins. I have a P4 1.8. I've got a 2.8ghz at work that I can try a few tests on tomorrow, but it seems the difference is negligable.

I'd try mpeg2dec2, but i'm not giving up AVS 2.5
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