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30th April 2002, 01:44 | #1 | Link |
the Interrogator
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Why don't I get an appreciable speed increase with fast Reprocess and DivX5.0?
Am using VDub 1.4.10 and DivX Pro 5.0 on a Duron 1 GHz/256 MB RAM/WIN Me.
Create D2V project file with DVD2AVI v1.76, use GKnot 0.23 to set cropping and resizing. Open the project file, do Save and Encode, select Neutral Bicubic and save the AVS for use in VDub. I'm used to using VDub's Full processing Mode but when I try Fast Reprocess and the AVS above, if anything the rip is slower, not faster (doing 2-pass encoding). Others say they get a 30 % processing speed increase from using Fast Reprocess. Can anyone suggest what my problem is? thanx JB |
30th April 2002, 02:02 | #2 | Link |
DivX.com Mod Squad
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Hi,
DivX 5 has some new features, like b-frames, gmc, and quarter-pixel settings. If you use these, especially q-pel, it takes more processing to encode/decode the video stream. This means that while divx5 may be faster in a basic format, the addition of these features slows down the encoding, in some cases slower than divx4! dragoman |
30th April 2002, 09:36 | #4 | Link | |
the Interrogator
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Quote:
JB |
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30th April 2002, 10:55 | #5 | Link | |
Retired
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Quote:
I don't know if the MPEG4 feature do such a thing, but the best thing to test the speed-up with fast recompress is to do it without these features. |
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30th April 2002, 13:12 | #6 | Link |
Piper at theGates of Dawn
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Acaila, I think normal recompress does a colorspace conversion, right? And normal recompress for me is almost as fast as fast recompress, and those two are both substantially faster than full processing.
JimmyBarnes, consider buying more RAM. Even in Win98 SE the avisynth-Vdub-Divx5 combination takes at least 160MB (never seen it using less). You could check it out for free by borrowing a 256MB stick from a friend - I think it will help your overall encoding speed as well as the relative difference between fast recompress and full processing. |
1st May 2002, 08:33 | #9 | Link | |
the Interrogator
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Quote:
However on occasion I have used TV scale rather than PC scale for YUV->RGB, though even on the default PC scale, Fast Reprocess is no faster the Full Processing Mode. JB |
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1st May 2002, 09:52 | #10 | Link | |
the Interrogator
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Quote:
However I am strictly following Doom9's DivX 5 guide at present and he recommends using GMC, Bidirectional processing and Fast Reprocess, so I presime there is a point in using the latter. I timed a 10000 frame test using Full Processing Mode or Fast Reprocess as the only difference (typical settings for a DivX5 rip as per Doom9). Results were: FPM 17 min 14 s FR 16 min 12 s The FR time was 94 % of the FPM time. JB |
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1st May 2002, 11:28 | #11 | Link |
Retired
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Indeed, 6% speed-up is not something to write home about....
I still suspect you're using filters that slow things down. Things like TemporalSmoother and DeInterlacing usually negate the effect of Fast Recompress on my encodes. And as we all know the MPEG features slow everyone's encoding down too, so I wouldn't be surprised at all that if you used GMC, B-frames, and DeInterlacing you'd lose your speed benefit completely. I still recommend staying with Fast Recompress, because the fewer colorspace conversions the better, even if it doesn't speed things up for you. Besides, if you want a real speed-up, buy a faster computer! Mine should be delivered within the next few days, and it will be smoking fast when I put it together! |
1st May 2002, 11:59 | #12 | Link | ||
the Interrogator
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Quote:
Quote:
JB |
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2nd May 2002, 22:06 | #13 | Link |
Lurker by lack of time
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I have the same problem; Fast recompress has the same speed as Normal recompress (The only difference is that with fast recompress, I'm not able to see which scene is being encoded, and if I use normal recompress, disabling the "view in- and output" option, gets me some 1 till 2 FPS extra, ... Just as with Fast Recompress.)
The biggest difference I had, was putting in the 256MB DDR extra. (Avisynth is indeed rather greedy on RAM). Anyway, I still haven't found the problem, but I'm happy with the speed I have now
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3rd May 2002, 02:09 | #14 | Link |
Piper at theGates of Dawn
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Right now, Taskinfo2000 reports a RAM usage from Avisynth/VDub of 192 MB.
The total memory load (used by programs) is 50%, but I have only 79 MB of free available RAM left (while 110 MB are being used as cache). This is in Win98 SE with pagefile disabled. I really think 256 MB would be not enough. |
3rd May 2002, 08:23 | #17 | Link | |
the Interrogator
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Quote:
JB |
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3rd May 2002, 08:49 | #18 | Link |
Do you find me... pretty?
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That's strange... I've got about 20 DVDs that I'm currently ripping. Most of them are bought in scandinaivia (is that an english word?) and usually have swedish/danish/finnish/norweigan subtitles. DVD2AVI reports all of these as PAL 4:3 interlaced and that's how I've treated them. Come to think of it, some of these haven't looked interlaced in DVD2AVI or Gordian Knot and some have, but I've still used deinterlacing on them all which perhaps was a mistake if DVD2AVI indeed reports wrongly sometimes.
Is this perhaps something particular to Scandinavian DVDs? |
3rd May 2002, 10:36 | #19 | Link |
Retired
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DVD2AVI mis-identifies most normal PAL progressive DVD's as interlaced. NEVER trust what the stats windows says, but always scan through the preview if you see the actual interlacing artifacts or not. About 99% of the time you won't see interlacing for PAL sources, not even if they come from Scandinavia .
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