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Old 13th October 2006, 18:20   #241  |  Link
tritical
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[link removed, read down for a newer version], finally finshed the new version I mentioned back in January. Changes from v1.10:
Code:
+ Rewrote a large portion of the code
+ Added ability to convert between any of: Rec.709, FCC, Rec.601, and SMPTE 240M
+ Added source and dest parameters
+ Added scaling parameter (optional clipping and unscaled coefficients)
+ d2v option supports changing colorimetry info (with trim() and frame rearrangement restriction)
- fixed a problem with calculated luma values that were < 0 being set to 255 instead of 0
Main items are ColorMatrix can now convert between any of: Rec.709, FCC, Rec.601, and SMPTE 240M... everything in the mpeg2 specs. The pre/post clipping with limiter is optional, and there is also the option to use non-scaled coefficients if desired. The d2v option supports changing colorimetry (though there are still a few restrictions with using trim() and the like beforehand -- see the read me). The new syntax is:

ColorMatrix(clip, string "mode", int "source", int "dest", int "scaling", bool "interlaced", bool "hints", string "d2v", bool "debug", int "opt")

Last edited by tritical; 19th January 2007 at 01:38.
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Old 13th October 2006, 20:12   #242  |  Link
G_M_C
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The downloadlink times-out for me, guess the whole world is getting an update :P

Last edited by G_M_C; 13th October 2006 at 20:40.
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Old 15th October 2006, 02:10   #243  |  Link
Adub
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Shouldn't you update the title of the thread?
And maybe your website?
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Old 15th October 2006, 03:48   #244  |  Link
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hm, I had updated my website but the university's servers had a little outage around then and I guess something screwy happened. Anyways, it's updated now. I can't edit the thread title since it isn't mine. I opted not to post this in a separate thread so that all the ColorMatrix related info would stay together.
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Old 21st October 2006, 15:58   #245  |  Link
Alain2
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A few questions..
- When using colormatrix with the d2v parameter, do we still have to specify the interlace parameter ?

If so:
- If a PAL interlaced source, for a progressive one I suppose the interlace parameter should be set to false ?
But for a NTSC source, if the d2v was done with honor pulldown flags", should the interlaced parameter be true or false ? Same question for a d2v in forced film ?

I have these questions because the d2v analysed is showing fields, not frames I think, so I am not sure how the interlace parameter is used..

Thanks
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Old 21st October 2006, 16:50   #246  |  Link
Wilbert
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Quote:
A few questions..
- When using colormatrix with the d2v parameter, do we still have to specify the interlace parameter ?
Yes.

Quote:
for a progressive one I suppose the interlace parameter should be set to false ?
Yes.

Quote:
But for a NTSC source, if the d2v was done with honor pulldown flags", should the interlaced parameter be true or false ? Same question for a d2v in forced film ?
That's a good one. You need to make it progressive first by inverse telecining it. Note that the first frame is not altered by the ivtc process (the first few bytes are altered in the first frame when using hints in dgdecode), so you can use ColorMatrix directly after doing the inverse telecine.
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Old 21st October 2006, 17:55   #247  |  Link
canuckerfan
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I tried the above suggestion, to use colormatrix after IVTC, but it says no hints detected in red text. It worked fine when I called it before IVTC. here's my script:

Quote:
mpeg2source("E:\Video\Hindi Movies\Dil.Chahta.Hai.2001.DVD9-bj1988\temp\slow.d2v",idct=5,info=3)

Setmemorymax(512)

AssumeTFF()
Interp = SeparateFields().SelectEven().EEDI2(field=1)
Deinted=TDeint(order=1,field=1,edeint=Interp)
TFM(mode=6,order=1,PP=7,slow=2,mChroma=true,Clip2=Deinted)
TDecimate(mode=1)

ColorMatrix(mode="Rec.601->Rec.709",hints=true)

DeSpot(pwidth=65,pheight=65,p1=35,p2=14,mthres=25)
RemoveDirt()

Tweak(sat=1.12,cont=1.12,bright=10.4)

FFT3DFilter(sigma=2.2,ow=48/2,oh=48/2)
Dehalo_alpha()
LimitedSharpenFaster(Smode=4,Lmode=2,overshoot=14,strength=200)

Crop(0,48,0,-48)
AddBorders(0,48,0,48)

ConvertToYUY2()
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Old 21st October 2006, 18:12   #248  |  Link
Alain2
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Ok, so if I understand well:

- in case of a d2v in forced film, then I get a progressive clip out of mpeg2source, and thus set interlaced=false in colormatrix ?

- in case of a d2v in honor pulldown flags, then I have a telecined clip. You say it's better to ivtc first (with tfm+tdecimate for instance) before applying colormatrix, so in that case the d2v won't have the same number of frames than what is fed through colormatrix.
-- I can't use the d2v parameter then (so won't detect eventual changes of colorimetry within the clip) ?
-- If I don't ivtc first but place colormatrix with d2v=.. and interlaced=true immediately after mpeg2source, would that be a worse solution and why ?
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Old 21st October 2006, 23:19   #249  |  Link
Wilbert
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Quote:
- in case of a d2v in forced film, then I get a progressive clip out of mpeg2source, and thus set interlaced=false in colormatrix ?
Yes.

Quote:
- in case of a d2v in honor pulldown flags, then I have a telecined clip. You say it's better to ivtc first (with tfm+tdecimate for instance) before applying colormatrix, so in that case the d2v won't have the same number of frames than what is fed through colormatrix.
Yes.

Quote:
-- I can't use the d2v parameter then (so won't detect eventual changes of colorimetry within the clip) ?
I never thought about this, but i guess that means yes indeed.

Quote:
-- If I don't ivtc first but place colormatrix with d2v=.. and interlaced=true immediately after mpeg2source, would that be a worse solution and why ?
Yes, a little bit worse. The chroma of the clip will be blurred more in that case (because it's being treated as interlaced).

@canuckerfan,

Quote:
I tried the above suggestion, to use colormatrix after IVTC, but it says no hints detected in red text. It worked fine when I called it before IVTC. here's my script:
I'm not sure why, but perhaps tritical can explain. In any case, you can store the hints in a different clip:

Code:
Setmemorymax(512)

mpeg2source("E:\Video\Hindi Movies\Dil.Chahta.Hai.2001.DVD9-bj1988\temp\slow.d2v",idct=5,info=3)
savedHints = last
AssumeTFF()
Interp = SeparateFields().SelectEven().EEDI2(field=1)
Deinted=TDeint(order=1,field=1,edeint=Interp)
TFM(mode=6,order=1,PP=7,slow=2,mChroma=true,Clip2=Deinted)
TDecimate(mode=1)

MergeHints(hintClip=savedHints) # add hints back for use with ColorMatrix
ColorMatrix(mode="Rec.601->Rec.709",hints=true)

DeSpot(pwidth=65,pheight=65,p1=35,p2=14,mthres=25)
RemoveDirt()

Tweak(sat=1.12,cont=1.12,bright=10.4)

FFT3DFilter(sigma=2.2,ow=48/2,oh=48/2)
Dehalo_alpha()
LimitedSharpenFaster(Smode=4,Lmode=2,overshoot=14,strength=200)

Crop(0,48,0,-48)
AddBorders(0,48,0,48)

ConvertToYUY2()
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Old 21st October 2006, 23:58   #250  |  Link
tritical
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Quote:
-- I can't use the d2v parameter then (so won't detect eventual changes of colorimetry within the clip) ?
You can still use the d2v parameter as long as the colorimetry doesn't change at some point in the d2v. The same number of frames requirement is only enforced if colormatrix detects that the colorimetry does indeed change in the d2v file. That requirement is checked for during filter construction, so if you are able to load the script without an error then everything is fine. In the case that the colorimetry does change, colormatrix has to correctly match up input frames to frames in the d2v file to determine which frames need which conversion... thus the requirement that the number of frames be the same.

@canuckerfan
The hints wont survive tfm because by default it writes its own hints into the same bytes that dgdecode uses for hints. Unfortunately, the mergehints() workaround that Wilbert posted wont work correctly either since the frames in the saved clip wont match up with the frames after ivtc... which would be required to correctly handle changing colorimetry. If the colorimetry didn't change, then it would be fine, but in that case you could just use the d2v parameter.
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Old 22nd October 2006, 00:02   #251  |  Link
Wilbert
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@tritical,

So if you want to use hints on a telecined source, your only option is to use interlaced=true in ColorMatrix?
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Old 22nd October 2006, 00:02   #252  |  Link
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The interlacing part kind of confused me. I always though colomatrix worked like levels, where every value mapped to only one output value, and neighboring pixels had no influence. I guess I'm wrong about that? It should only effect interlaced chroma differently if a pixel's vertical neighbors are taken into account.
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Old 22nd October 2006, 00:14   #253  |  Link
Wilbert
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Quote:
The interlacing part kind of confused me. I always though colomatrix worked like levels, where every value mapped to only one output value, and neighboring pixels had no influence. I guess I'm wrong about that? It should only effect interlaced chroma differently if a pixel's vertical neighbors are taken into account.
Good that you mention Levels. I never thought about Levels in relation to interlaced stuff. I can't imagine it works correctly on an interlaced clip?

As for ColorMatrix
Quote:
I always though colomatrix worked like levels, where every value mapped to only one output value, and neighboring pixels had no influence.
For YV12, the chroma is adjusted for 2x2 pixels. For interlaced stuff you need to pick different 2x2 pixels than for progressive stuff. (Internally, SeparateFields().stuff().Weave() is done when interlaced=true.)
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Old 22nd October 2006, 00:17   #254  |  Link
tritical
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Quote:
So if you want to use hints on a telecined source, your only option is to use interlaced=true in ColorMatrix?
I'd say at the moment that would be the only save solution. i.e.

mpeg2source(info=3)
colormatrix(hints=true,interlaced=true)
otherstuff()

Or use an ivtc solution that wont mess with the hints. I'm not aware off hand of which could be guaranteed not to and under which circumstances they wouldn't. Though if you use a script such as:

mpeg2source(info=3)
ivtc()
colormatrix(hints=true)

and it doesn't complain about there not being hints then it should be fine.

@foxyshadis
As Wilbert said, the calculations require both luma/chroma to be considered together, so in interlaced YV12 the luma values that go with each set of chroma pixels is different for interlaced vs progressive.

Last edited by tritical; 22nd October 2006 at 03:12.
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Old 22nd October 2006, 02:24   #255  |  Link
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^If that's the case, to use the interlaced parameter for telecined material. Wouldn't the progressive frames be handled incorrectly?
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Old 22nd October 2006, 02:39   #256  |  Link
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Ah, that makes sense then. Levels (and color/coloryuv) acts independantly on each channel, so I was confused. Thanks.
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Old 22nd October 2006, 03:03   #257  |  Link
tritical
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^If that's the case, to use the interlaced parameter for telecined material. Wouldn't the progressive frames be handled incorrectly?
They wont be handled as well as they could so to speak, but it wont really change much overall. It's a lot like using converttoyuy2(interlaced=true) on progressive YV12 material. The difference between that and using converttoyuy2(interlaced=false) on the same material isn't that great. However, using converttoyuy2(interlaced=false) on interlaced YV12 material will give quite a big difference vs using converttoyuy2(interlaced=true)... at least in areas of motion.

The reason is that when you use interlaced=true you're making luma lines 0/2 use chroma line 0, luma lines 1/3 use chroma line 1, etc... instead of making luma lines 0/1 use chroma line 0, luma lines 2/3 use chroma line 1, etc... as would happen with interlaced=false.

The difference between those two isn't going to matter much when used on progressive material since everything comes from the same point in time. However, with interlaced material where every other line could be from a different point in time the mixing of chroma from one field with luma from another (which happens with interlaced=false) can cause very visible artifacts.

Unless you have clips with changing colorimetry that you need to handle, I would recommend using:

mpeg2source("d2v.d2v")
ivtc()
colormatrix(d2v="d2v.d2v")

I've only seen a handful of clips with changing colorimetry, and most of those just had small sections at the beginning of pure black frames which had a different colorimetry than the rest of the clip. In those cases, where the difference doesn't really matter, I just change the first line or two of the d2v so that the colorimetry matches the rest of the clip.

Last edited by tritical; 22nd October 2006 at 03:15.
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Old 22nd October 2006, 04:24   #258  |  Link
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Thanks for the explanation, tritical. Btw, really appreciate all the hard work that's been put into TDeint and TIVTC. Here's hoping you'll have time in the future to continue the magic plugs.
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Old 22nd October 2006, 12:23   #259  |  Link
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Thanks for the very detailed answers, got it all now
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Old 4th November 2006, 14:48   #260  |  Link
anne_so78
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I've noticed that the ColorMatrix filter makes the picture more yellowish. Although I like the warm tinge, I don't want anything distorting my videos. I'd like the encodes to stay as true to the original as possible (Encoding from VOB to x264 using meGUI). So, should I enable or disable the ColorMatrix filter? Thanks.

P.S- I've tried reading these pages but I couldn't figure out the ColorMatrix filter...
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