vdubmod slower ?

[HiRsch]

i downloaded the new gknot rippack, and i experienced a very slow encoding at only 10fps. before i had around 25.
got a p4 2ghz, 256mb ram

im encoding 25 minutes episodes to XviD, using 2 pass and soft bicubic resize filter, but all the other resize filter end up with the same slow speed.

can anyone tell me what this is about?
greez HiRsch

[N_F]

Two things to check: Are you using different XviD settings? Have you selected any denoiser?

[Mr. Pro]

I've got the same problem...

And it seems GordianKnot is not to blame, VirtualDubMod is the cause... No matter what resize options or other stuff I set, it encodes always at 8-12 fps :angry:

Also when I don't use GordianKnot and simply open files in VirtualDubMod to encode them (without any resize or shit) I get 8-12 fps encoding :confused:

Very frustrating, VirtualDub(NOT VirtualDubMod) gives me 26-30 fps encoding with all the same options

It just seems to me like the VirtualDubMod executable is not at all optimized for P4, in fact it is slowing down P4 (the not P4 optimzed VirtualDub (NOT VirtualDubMod) even gives me 18-22 fps encoding)

----------------------------
System where problem occurs:
Pentium 4 2.0 Ghz
1 GB RDRAM PC800
2x WD 100GB
DivX 5.05
...I think the rest doesn't matter

[Dark-Cracker]

have u tested with vdub in stand alone or vdub started with Gknot ?
have u tested with vdubmod in stand alone ?
it's perhaps the loop used in gknot to check the vdubmod status that use CPU.

i don't see why vdubmod will slowdown encoding.

[Mr. Pro]

Thanks for your reply, but,

VirtualDub works fast (26-30 fps) both in standalone and in combination with GordianKnot

VirtualDubMod on the other hand, works slow (8-12 fps) both in standalone and in combination with GordianKnot

Also I made a big test yesterday with DivX 5.02, the exact same movie that takes me 3,5 hours to encode with GordianKnot 0.27 (still uses VirtualDub) takes me 10+ hours to encode with GordianKnot 0.28 (VirtualDubMod)

Also I want to know if there are any P4 users out there who don't have the same problem (if there are :p)

[wingphil]

i don't have a p4, but i think there's a p4 and a non-p4 version of vdmod.

check the sourceforge.

[japouleripeur]

I have a P4 and I didn't notice any slow down with the last releases (between 20 and 30 fps depending on the movie size with P4 1,7) .
I've tried Xvid and DIvx. Xvid is much more slower.

[manono]

Hi-

No slowdowns here using a P4 and VDubMod 1.4.13.

Anything unusual in the .avs? There's a thread here (http://forum.doom9.org/showthread.php?s=&threadid=51991) about slowdowns, that if not exactly the problem, may be related.

[Mr. Pro]

First of all, thx for your help in the PM's manono

It seems there is indeed something very wrong with DivX on my PC.

I keep hearing from people that XviD generally encodes slower than DivX (you also mentioned that DivX encodes faster on your PC)

Now to make sure I set up a test project in GordianKnot...

And I ran the exact same thing in XviD and in DivX (no other changes, I just changed the radio buttons) and these are the results

--------------------

XviD
----

1st pass: 33.870 fps
2nd pass: 35.199 fps

DivX
----

1st pass: 12.977 fps
2nd pass: 11.263 fps

--------------------

And DivX is supposed to be faster?? I guess I'll uninstall DivX, clean my registry and try again, indeed something must be wrong with DivX and NOT with VirtualDubMod (my appologies to the creator of this fine peace of software)

[Mr. Pro]

Problem solved...

I used to encode with QuarterPixels, GMC and Bidirectional Encoding all enabled...

Now it seems that QuarterPixels where not much of a slowdown in DivX 5.01 and 5.02, but now in 5.05 they slow me down A LOT

Also, It seems I had 2 divx versions 5.02 and 5.05 running at the same time (damn fuckin' windows)

I upgraded 5.02 to 5.05 and refused to reboot when the installer asked me to... Now, it seems that when you upgrade to 5.05 and refuse to reboot when he asks for... you're fucked (rebooting afterwards doesn't help (at least it didn't help for me))

And as a result of that, when I encoded using VirtualDub, it seems he still used 5.02 in som way (wtf??) QuarterPixels enabled but no slowdown like it used to be with 5.02

While VirtualDubMod on the other hand used 5.05 (I really don't understand how this was possible, but it's a fact) QuarterPixels also enabled, but a HUGE slowdown like it is when you use 5.05

-----

I uninstalled DivX from my PC and then searched the registry for anything with "divx" in it, and deleted everything...

rebooted, and installed 5.05 again...

Now when I encoded, both VirtualDub & VirtualDubMod used the new 5.05, and both programs encoded really slow as the result...

then I started to fiddle around with my settings and found that QuarterPixels in 5.05 are extremely slow (at least, they are on my PC now...)

I set up a testproject and first encoded with QuarterPixels, GMC & Bidirectional Encoding set to ON...

average encoding speed of both passes where about 9 fps (sloooooow)

Then I ran the exact same project again with GMC & Bidirectional Encoding set to ON, but QuarterPixels DISABLED

average encoding speed of both passes now went up from about 9 fps to about 35 fps (my old speed)

-----

So, I guess I'll stop using QuarterPixels from now on (or until there's a new DivX version where they are fast again)

-----

/me is happy now :D

[wingphil]

i've never used quater pixels, i always use b-directional, and i only use gmc where i'm restricted on bitrate.

[Gazza]

I don't use Divx myself but I am a dedicated user of xvid (its just my personal preference).

I have noticed that some of you have reported fps up to 35. I would be interested to know if you get this frame rate with what features enabled in xvid (qpel, b-frames, vhq, etc.

I have a p3 1Ghz and achieve about 10fps without qpel, b-frames, etc. But when b-frames, vhq and qpel, etc the fps drops to a miserable 2 or 3 fps.

I would be interested to see if other users (with similar machines) see this same performance. Maybe there is something wrong with my setups, e.g. should I not have Divx installed at the same time, etc?

[frodoontop]

@Gazza:
I also use xvid. And it seems there's something wrong with your setup. Otherwise you're using some heavy filtering or a high resolution. I am using a 800 Mhz Athlon to encode and without filtering, with qpel, gmc, bframes 3-100-200 I get usually about 8-9 fps at a resolution of 512x288 or 6-7 at a resolution of 576x320, which is more than enough anyway if you use LanczosResize.
By the way: VHQ is a real performance killer, only use it when it's necessary.

[Gazza]

@ frodoontop

I tend to use no filtering, almost always LanczosResize and convolution3d. However I do use gknot to generate the original avs file and try to squeeze out the most by going to the highest res possible. Its not unusual for me to try for 720x??? Maybe this is why my processor is always maxed out. I have always thought that going to lower res would lower the max quality available?

Gazza

[LordIntruder]

LanczosResize and convolution3d are both eating lots of cpu cycle. Try using NormalBicubicResize with no filter and you'll see the difference.

Also you say you tend to not use any filter but convolution3D is a denoise filter (also used to make the movie more compressible).

[Gazza]

@LordIntruder

You are right. It is time I ran some tests without these.

Cheers

Gazza

[BloodyRipper]

yeah, well...i had a PAL 4:3 movie in gknot 0.28(with vdubmod), selected output resolution 640x352 or something like it, audio 320 kBit/s and video bitrate 1800 kBit/s(DivX 5.0.5 PRO). i don't know what you're talking about, because i haven't got as many problems as you do, but i think you should upgrade to divx505 or code at divx311alpha. vdubmod was really slowed up when i selected the lowest priority, but that's allright. on normal priority, it coded a 1h 30m movie at 1h 30m, so that's allright. i've got athlon 1700+ and 256mb kingston ddr 266mhz, 40gb ntfs hd. consider upgrading to divx505

[jeremymacmull]

hey there

Ive got the same sort of problem

ive got a p3 850 and before with .27 if i did not have b frames enabled (i rarely used the other features ) and used neutral bicubic i used to get 15 fps in first pass and 19-23 fps in second pass with 5.02 (with yv12 hack for .27)

now with 5.05 and gknot .28.2 beta i only get 12 -14 fps on first pass and second pass in original 2 pass method with the same settings on the same movies

i was wondering if it was the codec or vdubmod cos that is quite a difference in speed

JEREMY

Secondly a possible bug

i .27 if i did several compressibility checks and wanted to load another one into gknot i pressed the load button and it did it

the new gknot when i click load and select the relevant log file does not actually load it cos the compressibility values dont change at all. It might be me but i doubt it

JEREMY