Integer DCT/iDCT filter questions - Page 5

Marc FD · 7th December 2002, 20:18

absolute difference for each pixel. no sad.
no adaptive settings (only quant-adaptive)

i've finished the MMX algo, i just want to make a 3d avisynth filter with for fun. i'm going to implement it. i hope it'll improve a _lot_ speed.

MfA · 7th December 2002, 21:21

You make the choice per pixel?

Marc FD · 7th December 2002, 21:23

yes, i know i could do more complex things but i feel per-pixel is good ^^

zyrill · 16th December 2002, 16:39

have i missed a post or is there still no version for non-p4? if not:

(athlon) if there is:

and pls drop me a line.

trbarry · 16th December 2002, 19:01

Quote:

have i missed a post or is there still no version for non-p4? if not: (athlon) if there is: and pls drop me a line.

No version of DctFilter?

Mine should have no processor requirements above mmx though it will do special code for higher ones. Note my version supports Avisynth 2.5a YV12 only though SansGrip posted a more general one above for YUY2 and other releases. So if it's crashing make sure you've got the right one.

- Tom

seewen · 29th January 2003, 22:44

You said that you didn't add "init2" to DctFilter beccause Sansgrip have worked on it, and it will be "better".

But DctFilter works already with 2.5 alpha. So is it possible that you just add "init2" to the 2.5alpha ?

So we can use this filter without having to wait "too long" for Sansgrip

trbarry · 29th January 2003, 22:59

It seems more likely that you are not using the later 2.5 alpha or beta that requires the init2.

Or else you didn't get it from my site.

- Tom

Boulder · 30th January 2003, 08:48

I think Seewen asked if you could compile the old (current) YV12 version with init2 so that he (we

) could use it with AVS2.5 beta.

seewen · 30th January 2003, 11:11

I get it from your site ( trbarry.com/dctfilter ), but there's no "init2" in it.

SO it works very well with Avisynth 2.5 from 18.1.03 , but not with older versions

trbarry · 30th January 2003, 17:11

I'll try to work on DctFilter today. I don't want to lose the YUY2 support but it really shouldn't be much work to make it function properly with VS6, 2.5 beta, etc.

And I had some other ideas I'd like to add to it later so it's time for me to get back to it.

Hopefully I'll post one by tonight if nothing else comes up.

- Tom

seewen · 30th January 2003, 20:18

Quote:

Originally posted by trbarry
I'll try to work on DctFilter today. I don't want to lose the YUY2 support but it really shouldn't be much work to make it function properly with VS6, 2.5 beta, etc.

And I had some other ideas I'd like to add to it later so it's time for me to get back to it.

Hopefully I'll post one by tonight if nothing else comes up.

- Tom

That's really nice

Beccause this filter is really missing

( DctFilter & MpegDecoder-working-with-Mpeg1, and it will be great )

trbarry · 31st January 2003, 05:57

... but get it at www.trbarry.com/DctFilter.zip .

It has support for Avisynth 2.5 beta, VS6, YV12, and SansGrip's YUY2 code. (Thank's SansGrip

)

No other new features or changes yet.

- Tom

Bulletproof · 31st January 2003, 06:56

I have a question, which I think is related. DCT is used in many video compression standards, such as MPEG-4 and MPEG-2. My question is, couldn't the MPEG-4 compressor benefit from the MPEG-2 files already containing quantizing information. Isn't there alot of efficiency lost in making a locked quantizer 2 file on scenes that have high quantization done on them. Couldn't there be a way to read the MPEG-2 file's quantization/DCT information per frame so that better decisions could be made in the MPEG-4 compression process? For instance, if a frame in the original MPEG-2 file has high quantization and you've used a locked 2x quantizer, that increases the filesize for no reason. I realize that you can achieve proper compression where quantizer 2 will be used in the appropriate situation with the right settings, however I don't think it would be "dead-on". What I'm saying I guess is to add quantizer decisions based on the MPEG-2 frames quantization/DCT information.

seewen · 31st January 2003, 09:16

Thank you very much

You've done it very fast, and so far it works perfectly

trbarry · 31st January 2003, 14:28

optimist (falling past 20'th floor): "So far, so good."

Bulletproof -

Dunno. Maybe someone else can answer that. But there is a thread now in the development forum about transcoding and shrinking MPEG2 files.

- Tom

Boulder · 31st January 2003, 16:33

Thank you maestro

iago · 31st January 2003, 19:59

Thanks Tom!
I'm just starting a 120min 1CD encode keeping the 350mb ac3 audio

.

trbarry · 31st January 2003, 21:17

I'm afraid to ask.

iago · 31st January 2003, 22:38

Ah, of course I was kidding Tom

, but I just want to report that, with the script below,

-----------------------------------
mpeg2source("C:\movie\movie.d2v")
crop(12,16,-8,-16)
Trim(16000,17000) # a short bright scene from U-Turn
BicubicResize(512,272,0,0.5)
DctFilter(1,1,1,1,1,.5,.5,0)
-----------------------------------

and using constant quantizer 2 with XviD Koepi's latest (and AviSynth 2.5 beta), the filesize is 20774kb whereas without DctFilter in the same script the filesize is 25062kb.

Using b-frames 3-100-200, the filesize drops to 16658kb, without losing much from its visual quality.

I don't know what if you add some UnFilter to the script to remove the stairstepping artifacts, etc. ?!

regards,
iago

Btw, why are you afraid Tom? The photo is taken after the last plastic surgery I had. I dared not send a formerly taken one

.

mikeson · 31st January 2003, 22:43

@iago:

Is this really you?

30th January 2003, 08:48	#88 \| Link
Boulder Pig on the wing Join Date: Mar 2002 Location: Finland Posts: 5,729	I think Seewen asked if you could compile the old (current) YV12 version with init2 so that he (we ) could use it with AVS2.5 beta. __________________ And if the band you're in starts playing different tunes I'll see you on the dark side of the Moon...

31st January 2003, 05:57	#92 \| Link
trbarry Registered User Join Date: Oct 2001 Location: Gainesville FL USA Posts: 2,092	Sort of at the 11'th hour ... but get it at www.trbarry.com/DctFilter.zip . It has support for Avisynth 2.5 beta, VS6, YV12, and SansGrip's YUY2 code. (Thank's SansGrip ) No other new features or changes yet. - Tom

31st January 2003, 16:33	#96 \| Link
Boulder Pig on the wing Join Date: Mar 2002 Location: Finland Posts: 5,729	Thank you maestro __________________ And if the band you're in starts playing different tunes I'll see you on the dark side of the Moon...

31st January 2003, 22:43	#100 \| Link
mikeson Registered User Join Date: Dec 2001 Location: Czech Republic Posts: 261	@iago: Is this really you? __________________ mikeson

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7th December 2002, 20:18	#81 \| Link
Marc FD XviD fan Join Date: Jun 2002 Location: France Posts: 907	absolute difference for each pixel. no sad. no adaptive settings (only quant-adaptive) i've finished the MMX algo, i just want to make a 3d avisynth filter with for fun. i'm going to implement it. i hope it'll improve a _lot_ speed.

7th December 2002, 21:21	#82 \| Link
MfA Registered User Join Date: Mar 2002 Posts: 1,075	You make the choice per pixel?

7th December 2002, 21:23	#83 \| Link
Marc FD XviD fan Join Date: Jun 2002 Location: France Posts: 907	yes, i know i could do more complex things but i feel per-pixel is good ^^

16th December 2002, 16:39	#84 \| Link
zyrill Registered User Join Date: Jan 2002 Location: Germany Posts: 83	have i missed a post or is there still no version for non-p4? if not: (athlon) if there is: and pls drop me a line.

29th January 2003, 22:44	#86 \| Link
seewen Registered User Join Date: Jun 2002 Posts: 250	You said that you didn't add "init2" to DctFilter beccause Sansgrip have worked on it, and it will be "better". But DctFilter works already with 2.5 alpha. So is it possible that you just add "init2" to the 2.5alpha ? So we can use this filter without having to wait "too long" for Sansgrip

29th January 2003, 22:59	#87 \| Link
trbarry Registered User Join Date: Oct 2001 Location: Gainesville FL USA Posts: 2,092	It seems more likely that you are not using the later 2.5 alpha or beta that requires the init2. Or else you didn't get it from my site. - Tom

30th January 2003, 11:11	#89 \| Link
seewen Registered User Join Date: Jun 2002 Posts: 250	I get it from your site ( trbarry.com/dctfilter ), but there's no "init2" in it. SO it works very well with Avisynth 2.5 from 18.1.03 , but not with older versions

30th January 2003, 17:11	#90 \| Link
trbarry Registered User Join Date: Oct 2001 Location: Gainesville FL USA Posts: 2,092	I'll try to work on DctFilter today. I don't want to lose the YUY2 support but it really shouldn't be much work to make it function properly with VS6, 2.5 beta, etc. And I had some other ideas I'd like to add to it later so it's time for me to get back to it. Hopefully I'll post one by tonight if nothing else comes up. - Tom

31st January 2003, 06:56	#93 \| Link
Bulletproof Registered User Join Date: Jan 2002 Posts: 318	I have a question, which I think is related. DCT is used in many video compression standards, such as MPEG-4 and MPEG-2. My question is, couldn't the MPEG-4 compressor benefit from the MPEG-2 files already containing quantizing information. Isn't there alot of efficiency lost in making a locked quantizer 2 file on scenes that have high quantization done on them. Couldn't there be a way to read the MPEG-2 file's quantization/DCT information per frame so that better decisions could be made in the MPEG-4 compression process? For instance, if a frame in the original MPEG-2 file has high quantization and you've used a locked 2x quantizer, that increases the filesize for no reason. I realize that you can achieve proper compression where quantizer 2 will be used in the appropriate situation with the right settings, however I don't think it would be "dead-on". What I'm saying I guess is to add quantizer decisions based on the MPEG-2 frames quantization/DCT information.

31st January 2003, 09:16	#94 \| Link
seewen Registered User Join Date: Jun 2002 Posts: 250	Thank you very much You've done it very fast, and so far it works perfectly

31st January 2003, 14:28	#95 \| Link
trbarry Registered User Join Date: Oct 2001 Location: Gainesville FL USA Posts: 2,092	optimist (falling past 20'th floor): "So far, so good." Bulletproof - Dunno. Maybe someone else can answer that. But there is a thread now in the development forum about transcoding and shrinking MPEG2 files. - Tom

31st January 2003, 19:59	#97 \| Link
iago retired Join Date: Jun 2002 Location: hollywood Posts: 1,013	Thanks Tom! I'm just starting a 120min 1CD encode keeping the 350mb ac3 audio .

31st January 2003, 21:17	#98 \| Link
trbarry Registered User Join Date: Oct 2001 Location: Gainesville FL USA Posts: 2,092	I'm afraid to ask.

31st January 2003, 22:38	#99 \| Link
iago retired Join Date: Jun 2002 Location: hollywood Posts: 1,013	Ah, of course I was kidding Tom , but I just want to report that, with the script below, ----------------------------------- mpeg2source("C:\movie\movie.d2v") crop(12,16,-8,-16) Trim(16000,17000) # a short bright scene from U-Turn BicubicResize(512,272,0,0.5) DctFilter(1,1,1,1,1,.5,.5,0) ----------------------------------- and using constant quantizer 2 with XviD Koepi's latest (and AviSynth 2.5 beta), the filesize is 20774kb whereas without DctFilter in the same script the filesize is 25062kb. Using b-frames 3-100-200, the filesize drops to 16658kb, without losing much from its visual quality. I don't know what if you add some UnFilter to the script to remove the stairstepping artifacts, etc. ?! regards, iago Btw, why are you afraid Tom? The photo is taken after the last plastic surgery I had. I dared not send a formerly taken one .