YV12To422

Abstract
Author	Chikuzen
Version	v1.0.2
Download	YV12To422-1.0.2.zip
Category	Colourspace Conversion
License	GPLv2
Discussion

Description

YV12To422 is an AviSynth filter plugin which based on YV12ToYUY2(ddcc.dll) written by Kevin Stone(a.k.a tritical) and was written from scratch.

Requirements

• [x86]: AviSynth+ or AviSynth 2.6
• [x64]: AviSynth+
• Supported color formats: YUY2, YV12, YV16
• SSE2 Capable CPU

• Microsoft Visual C++ 2013 Redistributable Package (x86 / x64)

*** vcredist_x86.exe is required for YV12To422-x86

*** vcredist_x64.exe is required for YV12To422-x64

Syntax and Parameters

YV12To422 (clip, bool "interlaced", int "itype", int "cplace", bool "lshift", bool "yuy2", bool "avx2", bool "threads", float "b", float "c")

clip   =

Input clip must be YV12. Output format is YUY2(default) or YV16.

bool  interlaced = false

Sets whether or not the input video is interlaced or progressive.

Default: false

int  itype = 2

Sets interpolation method. Possible settings:

• 0 : duplicate (nearest neighbor)
• 1 : linear interpolation
• 2 : Mitchell-Netravali two-part cubic interpolation (adjustable b/c parameters to adjust blurring/ringing)

Default: 2

int  cplace =

Specifies vertical chroma placement. Possible settings:

    progressive input (interlaced=false, progressive upsampling):

        0 - chroma is aligned with top line of each two line pair within the frame

            This would be the case if during 4:2:2 -> 4:2:0 conversion the chroma values of
            odd lines were simply dropped.

        1 - chroma is centered between lines of each two line pair within the frame
            (*** h261, h263, mpeg1, mpeg2, mpeg4, h264 standard progressive conversion)

            This would be the case if during 4:2:2 -> 4:2:0 conversion the chroma from every
            two line pair was averaged, or if an interlaced 4:2:2 -> 4:2:0 conversion was performed
            by using 75/25 averaging of top field pairs and 25/75 averaging of bottom field pairs.

        2 - chroma is aligned with top line of each two line pair within each field

            This would be the case if the 4:2:2 -> 4:2:0 conversion was performed by
            separating the fields, and then doing a 4:2:2 -> 4:2:0 conversion on each field
            by dropping odd line chroma values.

        3 - chroma is centered between lines of each two line pair within each field

            This would be the case if the 4:2:2 -> 4:2:0 conversion was performed by
            separating the fields, and then doing a 4:2:2 -> 4:2:0 conversion on each field
            by averaging chroma from every two line pair.

    interlaced input (interlaced=true, interlaced upsampling):

        0 - chroma is aligned with top line of each two line pair within each field

            This would be the case if the 4:2:2 -> 4:2:0 conversion was performed by
            separating the fields, and then doing a 4:2:2 -> 4:2:0 conversion on each field
            by dropping odd line chroma values.

        1 - chroma is centered between lines of each two line pair within each field

            This would be the case if the 4:2:2 -> 4:2:0 conversion was performed by
            separating the fields, and then doing a 4:2:2 -> 4:2:0 conversion on each field
            by averaging chroma from every two line pair.

        2 - top field chroma is 1/4 pixel below even lines in the top field, and
            bottom field chroma is 1/4 pixel above odd lines in the bottom field.
            (*** mpeg2, mpeg4, h264 standard interlaced conversion)

            This would be the case if the 4:2:2 -> 4:2:0 conversion was performed by
            averaging top field pairs using 75/25 weighting, and averaging bottom field
            pairs using 25/75 weighting.  This results in the same chroma placement as
            progressive cplace option 1.

        3 - U is aligned with top line of each two line pair within each field, and
            V is aligned with bottom line of each pair within each field.
            (*** DV-PAL standerd interlaced conversion)

    ** Progressive option 1 and interlaced option 2 are actually the same in terms of
       chroma placement.  If a progressive frame was converted to yv12 using interlaced
       method 2, then it is safe (actually better) to convert it to yuy2 using progressive
       method 1.  However, if a progressive frame was converted to yv12 using a different
       type of interlaced sampling, resulting in different chroma placement (such as those
       described by interlaced options 0 or 1), then it is best to convert it to yv16/yuy2
       using progressive upsampling, but with the cplace option that correctly specifies
       the positioning of the chroma.

  default:  1 (if interlaced = false)
            2 (if interlaced = true)

bool  lshift = false

If set this to true, chroma placement will shift to 1/4 sample to the left.

• Default: false

bool  yuy2 = true

Sets whether or not the output video format is packed(YUY2) or planar(YV16).

Default: true (YUY2 output)

bool  avx2 = false

Sets whether AVX2 is used or not.

Default: false (use SSE2)

    ** Currentry, AviSynth 2.60 can't make memory alignment anything but 16bytes.
       Thus, if you use AviSynth 2.60, you shouldn't to set this true.
       AviSynth+ has no problem.
       see https://github.com/AviSynth/AviSynthPlus/commit/ab4ea303b4ca78620c2ef90fdaad184bc18b7708

bool  threads = false

When sets this to true, V-plain is processed with a different thread at the same time with U-plain. However, processing doesn't always become speedy by this.

Default: false (use single thread)

float  b = 0.0

float  C = 0.75

Adjusts properties of cubic interpolation (itype=2). Same as AviSynth's BicubicResize filter.

default: 0.0,0.75

Examples

TODO

External Links

• GitHub - Source code repository.

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