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Old 12th December 2004, 07:54   #61  |  Link
scharfis_brain
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no! you should have read the AVISynth documentation.

FixBrokenChromaUpsampling() will correct a progressively upsampled to interlaced upsampling. But that is NOT the case with the canopus decoder. it upsamples correctly in relation with interlacing.
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Old 12th December 2004, 10:28   #62  |  Link
henryho_hk
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Quote:
Originally posted by scharfis_brain
But that is NOT the case with the canopus decoder. it upsamples correctly in relation with interlacing.
I am referring to ScrollLock's sticky thread DV decoder differences.

From your advice, as my target is YV12 (MPEG1 or WMV actually), I think I should either:

1) grab the YVY2 output of Canopus and then point-sample (reducetoyv12) it to YV12; or

2) try the YV12 output of ffdshow's VFW module.

I am particularly interested if ffdshow will deliver both PAL and NTSC outputs correctly.

Last edited by henryho_hk; 12th December 2004 at 12:37.
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Old 12th December 2004, 14:56   #63  |  Link
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if your chroma look coarse interlaced instead of being fine combed, you will need fixbrokenchromaupsampling().
otherwise you won't need it.

my canopus decoder is working correctly!

PAL can be used with ffdshow's YV12 output.

but for NTSC it is a mess, cause it puts out the 4:1:1 samples chroma as YV12 data, which is handled by AVISynth as 4:2:0 sampled chroma.

Just use normal NTSC-DV decoding as it is.
maybe use reinterpolate411() afterwards.
you will not gain anything by working with YV12 output here.
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Last edited by scharfis_brain; 12th December 2004 at 14:59.
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Old 12th December 2004, 15:54   #64  |  Link
Wilbert
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@scharfis_brain

Quote:
Natural video is not that suited for checking for half pel chroma displacements, I think.
So I came to that (probably wrong) conclusion that DV Cams are building conventional YV12.
I disagree. But, perhaps it differs by DV codec. Let's consider MainConcept, and look at the following script

Code:
function translation(clip clip, clip "LClip", int "start_frame", int "beginX", int "beginY", int "end_frame", 
  \  int "endX", int "endY") {
  return Animate(start_frame, end_frame, "layer", clip, LClip, "Add", 255, beginX, beginY, 
    \  clip, LClip, "Add", 255, endX, endY)
}


c = BlankClip(width=720,height=576,pixel_type="YUY2")
c2 = ImageSource("F:\411_vs_420\1-720-pal.bmp",0,250,25,false).ConvertToYUY2()

ct = translation(c, c2, 0, 0, 0, 99, 720, 288)
cf = ct.SeparateFields.SelectEven
cf.Weave
AssumeFPS(25)
c1 = last.KillAudio

c2 = DirectShowSource("F:\411_vs_420\mc_int.avi", fps=25)  # interlaced YV12
#ConvertToYUY2(interlaced=true)
c1 = c1.ConvertToYV12(interlaced=true)

#Subtract(c1,c2)
StackVertical(c1,c2)
1) picture: http://www.geocities.com/wilbertdijkhof/pal.zip
2) mc_int.avi is the script (forming the clip "c1") encoded with MainConcept (also in pal.zip).

If mc_int.avi would have been upsampled to YV12 using MPEG-2 sampling, the clips c1 and c2 would be identical. As you can see, they are not.
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Old 13th December 2004, 17:59   #65  |  Link
ixpi2001
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sorry to intefere in your discussion.. i wonder if there is a possibility to only display one of the color channels a time. not in interpolated fullscreened size, but with ie the red pixels in just the position they are stored:
l1:x x x
l2: blank
l3:x x x
would be interesting to see, dont you think?
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Old 14th December 2004, 01:07   #66  |  Link
henryho_hk
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Quote:
Originally posted by ixpi2001
i wonder if there is a possibility to only display one of the color channels a time.
I have a shot that a man in a grey suit is moving in front of a red background. I think it help beginners like me to see how interpolate420() and fixbrokenchromaupsampling() works.

Is the following script correct?
<<deleted>>

Last edited by henryho_hk; 6th September 2005 at 16:13.
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Old 23rd June 2005, 19:57   #67  |  Link
Video Dude
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Sorry for the late reply, but better late then never.

Its not a question of which better, but which format you use, PAL or NTSC, which depends on what county you live in.

Yes, I would recommend using the ReInterpolate411 filter if you are encoding NTSC DV into MPEG-2. It does a great job.
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Old 27th August 2005, 17:24   #68  |  Link
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Quote:
Originally Posted by henryho_hk
I have a shot that a man in a grey suit is moving in front of a red background. I think it help beginners like me to see how interpolate420() and fixbrokenchromaupsampling() works.
Post your screenshots.
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Old 6th September 2005, 11:17   #69  |  Link
Wilbert
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Still waiting for your screenshots

edit: oops sorry

Quote:
# ffdshow
m_dvsd_yuy2=avisource("p3.avi",pixel_type="YUY2",fourcc="dvsd")
m_dvsd_yv12=avisource("p3.avi",pixel_type="YV12",fourcc="dvsd")
This can't be the DV codec which comes with ffdshow. The latter is a DirectShow based codec which can only be accessed by DirectShowSource. But perhaps i'm missing something
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Old 6th September 2005, 12:57   #70  |  Link
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Quote:
Originally Posted by Wilbert
This can't be the DV codec which comes with ffdshow. The latter is a DirectShow based codec which can only be accessed by DirectShowSource.
There is no vidc.dvsd setting in my registry but I've enabled ffdshow's DV decoding in its VFW & DS decoder. I do have a set of png files made by directshowsource but the forum does not allow me to post them (since they are identical to the dvsd vfw files).
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Old 6th September 2005, 17:23   #71  |  Link
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You might also want to test the MainConcept and Ulead (Sony) codecs.
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Old 8th September 2005, 07:05   #72  |  Link
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Quote:
Originally Posted by Wilbert
Still waiting for your screenshots
They seem a bit off-topic. I have moved them to the thread "DV decoder differences - update".
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Old 21st July 2006, 23:44   #73  |  Link
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I updated ReInterpolate420 plugin a little:

v3, 22 July 2006 -
color tint decreasing in progressive mode;
speed increasing in both modes by integer processing
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