AviSynth+ thread Vol.2

[Dogway]

Yes I know, but as I was suggested you can help the rounding by declaring more float values or like in the example I posted adding or substracting epsilon

I would like to know where I can read more about this, precisely related to the Expr rounding method, and if this also affects summation and not only multiplications.

[RRD]

On https://avs-plus.net/, at the bottom of the page, "You can find us on our Doom9 thread" links to the old thread instead of the new one.

[Dogway]

Since mid-grey in YUV (128) is not centered within the range (16-235), is it ok that range conversions don't keep mid-grey? Converting from TV range 128 to PC range leads to 130, and the opposite to 126. Shouldn't we compensate for that?

[wonkey_monkey]

"Mid-grey" is different in TV range than in PC range, just as black and white are. No need for compensation, I think.

Also bearing gamma in mind it's not even really "mid".

[Dogway]

I thought mid-grey for PC levels was also 128, at least for sRGB. I wasn't talking about scene referred middle grey.
Here's a little experiment, ColorYUV "correctly" converts mid grey to PC range 130, but then when converting that to RGB it keeps 130 when RGB mid-grey is known to be 128 for sRGB.

BlankClip(width=256,height=256,color=$828282,pixel_type="YV12")
ColorYUV(levels="TV->PC",matrix="Rec709")
ConvertToPlanarRGB(matrix="PC.709")

[DTL]

Can Avisynth+ support sequential function calling in scripting with freeing memory after each return ? I trying to make full-frame 1080p (and need 2160p) rasterizer of text for shifting with Animate(). Text is rendered with Subtitle and 100x SSAA with small blocks, but number of blocks is about 12 and system died with swapping at 4 GB memory PC. I think it is because all calls to function with Subtitle() and Overlay() are performed in parallel for each frame ? May exist solution for serializing ?

I can not even fill 1080p frame with text - I trying to render blocks of 132 lines into raw files for later stacking.

Current script:

LoadPlugin("plugins_JPSDR.dll")

function Ast1(clip c, int iFontSize, string strText, string strFont, float fHPos, int iVPos)
{
  iHSubPos=fHPos*10 - (10*Int(fHPos)) 
  temp=BlankClip(c, width=8000, height=(iFontSize*15)+40, color=$101010)
  temp=Subtitle(temp, strText, x=iHSubPos, font=strFont, size=iFontSize*10, align=4, halo_color=$FF000000, text_color=$00e0e0e0)
  temp=UserDefined2ResizeMT(temp, temp.width/10, temp.height/10, b=130,c=23)
  return Overlay(c, temp, Int(fHPos), iVPos)
}

function Ast2(clip c, int iFontSize, string strText, string strFont, float fHPos, int iVPos)
{
  iHSubPos=fHPos*10 - (10*Int(fHPos)) 
  temp=BlankClip(c, width=8000, height=(iFontSize*15)+60, color=$101010)
  temp=Subtitle(temp, strText, x=iHSubPos, font=strFont, size=iFontSize*10, align=4, halo_color=$FF000000, text_color=$00e0e0e0)
  temp=UserDefined2ResizeMT(temp, temp.width/10, temp.height/10, b=95,c=-10)
  return Overlay(c, temp, Int(fHPos), iVPos)
}

function MyFullFrameTextH(clip c, string strText, float fHPos, int iVShift)
{
  c=Ast1(c, 10, strText, "Arial", fHPos + 10, iVShift + 20)
  c=Ast1(c, 10, strText, "Times New Roman", fHPos + 70, iVShift + 20)
  c=Ast1(c, 10, strText, "Wolfgang Amadeus Mozart", fHPos + 130, iVShift + 20)

  c=Ast1(c, 20, strText, "Arial", fHPos + 180, iVShift + 20)
  c=Ast1(c, 20, strText, "Times New Roman", fHPos + 300, iVShift + 20)
  c=Ast1(c, 20, strText, "Wolfgang Amadeus Mozart", fHPos + 410, iVShift + 20)

  c=Ast1(c, 35, strText, "Arial", fHPos + 490, iVShift + 20)
  c=Ast1(c, 35, strText, "Times New Roman", fHPos + 690, iVShift + 20)
  c=Ast1(c, 35, strText, "Wolfgang Amadeus Mozart", fHPos + 880, iVShift + 20)

  c=Ast1(c, 50, strText, "Arial", fHPos + 1000, iVShift + 20)
  c=Ast1(c, 50, strText, "Times New Roman", fHPos + 1280, iVShift + 20)
  c=Ast1(c, 50, strText, "Wolfgang Amadeus Mozart", fHPos + 1550, iVShift + 20)

  c=Ast2(c, 10, strText, "Arial", fHPos + 10, iVShift + 80)
  c=Ast2(c, 10, strText, "Times New Roman", fHPos + 70, iVShift + 80)
  c=Ast2(c, 10, strText, "Wolfgang Amadeus Mozart", fHPos + 130, iVShift + 80)

  c=Ast2(c, 20, strText, "Arial", fHPos + 180, iVShift + 80)
  c=Ast2(c, 20, strText, "Times New Roman", fHPos + 300, iVShift + 80)
  c=Ast2(c, 20, strText, "Wolfgang Amadeus Mozart", fHPos + 410, iVShift + 80)

  c=Ast2(c, 35, strText, "Arial", fHPos + 490, iVShift + 80)
  c=Ast2(c, 35, strText, "Times New Roman", fHPos + 690, iVShift + 80)
  c=Ast2(c, 35, strText, "Wolfgang Amadeus Mozart", fHPos + 880, iVShift + 80)

  c=Ast2(c, 50, strText, "Arial", fHPos + 1000, iVShift + 80)
  c=Ast2(c, 50, strText, "Times New Roman", fHPos + 1280, iVShift + 80)
  c=Ast2(c, 50, strText, "Wolfgang Amadeus Mozart", fHPos + 1550, iVShift + 80)
  
  return c

}

function MyFullFrameTextH_upper(clip c, string strText, float fHPos, int iVShift)
{
  c=Ast1(c, 10, strText, "Arial", fHPos + 10, iVShift + 20)
  c=Ast1(c, 10, strText, "Times New Roman", fHPos + 70, iVShift + 20)
  c=Ast1(c, 10, strText, "Wolfgang Amadeus Mozart", fHPos + 130, iVShift + 20)

  c=Ast1(c, 20, strText, "Arial", fHPos + 180, iVShift + 20)
  c=Ast1(c, 20, strText, "Times New Roman", fHPos + 300, iVShift + 20)
  c=Ast1(c, 20, strText, "Wolfgang Amadeus Mozart", fHPos + 410, iVShift + 20)

  c=Ast1(c, 35, strText, "Arial", fHPos + 490, iVShift + 20)
  c=Ast1(c, 35, strText, "Times New Roman", fHPos + 690, iVShift + 20)
  c=Ast1(c, 35, strText, "Wolfgang Amadeus Mozart", fHPos + 880, iVShift + 20)

  c=Ast1(c, 50, strText, "Arial", fHPos + 1000, iVShift + 20)
  c=Ast1(c, 50, strText, "Times New Roman", fHPos + 1280, iVShift + 20)
  c=Ast1(c, 50, strText, "Wolfgang Amadeus Mozart", fHPos + 1550, iVShift + 20)

  return c

}

function MyFullFrameTextH_lower(clip c, string strText, float fHPos, int iVShift)
{
  c=Ast2(c, 10, strText, "Arial", fHPos + 10, iVShift + 80)
  c=Ast2(c, 10, strText, "Times New Roman", fHPos + 70, iVShift + 80)
  c=Ast2(c, 10, strText, "Wolfgang Amadeus Mozart", fHPos + 130, iVShift + 80)

  c=Ast2(c, 20, strText, "Arial", fHPos + 180, iVShift + 80)
  c=Ast2(c, 20, strText, "Times New Roman", fHPos + 300, iVShift + 80)
  c=Ast2(c, 20, strText, "Wolfgang Amadeus Mozart", fHPos + 410, iVShift + 80)

  c=Ast2(c, 35, strText, "Arial", fHPos + 490, iVShift + 80)
  c=Ast2(c, 35, strText, "Times New Roman", fHPos + 690, iVShift + 80)
  c=Ast2(c, 35, strText, "Wolfgang Amadeus Mozart", fHPos + 880, iVShift + 80)

  c=Ast2(c, 50, strText, "Arial", fHPos + 1000, iVShift + 80)
  c=Ast2(c, 50, strText, "Times New Roman", fHPos + 1280, iVShift + 80)
  c=Ast2(c, 50, strText, "Wolfgang Amadeus Mozart", fHPos + 1550, iVShift + 80)
  
  return c

}


function MyAnimFF(clip c, float fHPos, int VPos)
{
 temp=MyFullFrameTextH_upper(c, " TXT Sample ", fHPos, VPos)
  return MyFullFrameTextH_lower(temp, " TXT Sample ", fHPos, VPos)
#   MyFullFrameTextH(c, " TXT Sample ", fHPos, VPos)
}

full=BlankClip(501,1920,135,"Y16",fps=25, color=$101010)

Animate(full, 1,500, "MyAnimFF", 50, 0, 1, 0)

ConvertToRGB24()

Attempt to make cut function MyFullFrameTextH(clip c, string strText, float fHPos, int iVShift) into 2 pieces did not helps any - the amount of used memory is the same. The size of intermediate frames for AA operation is max about 8000x810 and it is about 12 MByte in size in Y16 format.

[poisondeathray]

Originally Posted by Dogway

I thought mid-grey for PC levels was also 128, at least for sRGB. I wasn't talking about scene referred middle grey.
Here's a little experiment, ColorYUV "correctly" converts mid grey to PC range 130, but then when converting that to RGB it keeps 130 when RGB mid-grey is known to be 128 for sRGB.

BlankClip(width=256,height=256,color=$828282,pixel_type="YV12")
ColorYUV(levels="TV->PC",matrix="Rec709")
ConvertToPlanarRGB(matrix="PC.709")

But if you use that assumption , and defining "middle grey" in sRGB as 128,128,128, shouldn't you should start with sRGB ?

RGB 128,128,128 => Y 126 in limited range, Y 128 in full range

So how are you defining "middle grey" in Y ?

BlankClip(width=256,height=256, color=$808080, pixel_type="RGB24")
ConvertToYV12(matrix="Rec709")
ColorYUV(levels="TV->PC",matrix="Rec709")
ConvertToPlanarRGB(matrix="PC.709")

RGB 128,128,128

[Dogway]

Well, YUV can also be sRGB (aka PC.709), so it wasn't a fault on my part, but reading on YCbCr I concluded that Y middle grey is actually 125.5.

Coming from analog (full range) RGB where 0.5 is asummed to be middle grey and converting to YUV by 0.5*(235-16)+16 = 125.5

This actually correctly transforms to 127.5 in PC range.

[Dogway]

Can this be fixed? Expr() gets the variables mixed in the first example.

Expr("x[0,0] M^ x[1,0] N^ x[2,0] O^ 
      M N + WA@ O + WB@ N - WB WA + + 4 /","")


Expr("x[0,0] M^ x[1,0] N^ x[2,0] O^ 
      M N + W@ O + X@ N - X W + + 4 /","")

[pinterf]

Originally Posted by Dogway

Can this be fixed? Expr() gets the variables mixed in the first example.

Expr("x[0,0] M^ x[1,0] N^ x[2,0] O^ 
      M N + WA@ O + WB@ N - WB WA + + 4 /","")


Expr("x[0,0] M^ x[1,0] N^ x[2,0] O^ 
      M N + W@ O + X@ N - X W + + 4 /","")

Sure. WA and WB? Anyway that must be an obvious bug, thanks for the report
EDIT: there was a bug with handling multi-letter parameter names ended with @. Fix is coming soon

[pinterf]

Fixed in
Avisynth+ 3.7.1 test build 11 (20210911)

[Reel.Deel]

Pinterf,

I found a bug in Overlay when the bitdepth is 16 and opacity is less than 1. Happens in RGB and YUV but the problem goes away at any other lower bitdepths.

base = Blankclip(width=270, height=69, color=$FFFFFF, pixel_type="YUV444P16")
over = Blankclip(width=270, height=19, color=$FF0000, pixel_type="YUV444P16")
mask = ExtractY(over).mt_lutspa(mode="relative", expr="x range_max *")

Overlay(base, over, mask=mask, x=0, y=3, mode="blend", opacity=.75)

[pinterf]

Originally Posted by Reel.Deel

Pinterf,
I found a bug in Overlay when the bitdepth is 16 and opacity is less than 1. Happens in RGB and YUV but the problem goes away at any other lower bitdepths.

What processor type do you have?
edit: issue emerges from SSE4.1 and up

[Reel.Deel]

Originally Posted by pinterf

What processor type do you have?

Intel i7 4930k. Let me update to the latest test version avs+. I have 3.7 installed right now.

Edit:



Edit 2:

Still the same behavior with latest test version and setting SetMaxCPU("sse3") or less fixes the problem.

[pinterf]

Fixed.
Avisynth+ 3.7.1 test build 12 (20210911)

[FranceBB]

Wow, so many builds, so little time to upgrade ehehehehe
Thanks for the new version, Ferenc, testing now.

[Dogway]

Originally Posted by pinterf

Sure. WA and WB? Anyway that must be an obvious bug, thanks for the report
EDIT: there was a bug with handling multi-letter parameter names ended with @. Fix is coming soon

Thank you! It was hard to work around it, I will test new version and if it works it allows for great optimizations in Expr()

[Reel.Deel]

Originally Posted by pinterf

Fixed.
Avisynth+ 3.7.1 test build 12 (20210911)

Just tested the new build and the shift is still there. It is not as drastic as before but with opacity < 1 it shifts the overlay image by 6 pixels to the left. Now the shift is consistent, before it would change depending on the opacity value.

[pinterf]

Originally Posted by Reel.Deel

Just tested the new build and the shift is still there. It is not as drastic as before but with opacity < 1 it shifts the overlay image by 6 pixels to the left. Now the shift is consistent, before it would change depending on the opacity value.

Thanks. I'm curious. Since I accidentally switched off my remote developer PC instead of the actual one over TeamViewer we'll have to wait until Monday.

[Reel.Deel]

Originally Posted by pinterf

Thanks. I'm curious. Since I accidentally switched off my remote developer PC instead of the actual one over TeamViewer we'll have to wait until Monday.

Excellent way to get off of working on a Sunday

----

I think I found another discrepancy. Using the color presets from here I cannot get the same results in Blankclip; it returns a different color.

Blankclip(width=132, height=152, color=$9400D3, pixel_type="rgb24") # color_darkviolet

I know it worked in the past but have not needed a colored blankclip in a while.