other ¶

@classmethod
def from_clip(cls, clip: vs.VideoNode, sar: bool = True) -> Self:
    """
    Get the DAR from the specified clip and SAR.

    Args:
        clip: Clip or frame that holds the frame properties.
        sar: Whether to use SAR metadata.

    Returns:
        A DAR object created using the specified clip and SAR.
    """

    return cls.from_res(clip.width, clip.height, Sar.from_clip(clip) if sar else None)

@classmethod
def from_res(cls, width: int, height: int, sar: Sar | None = None) -> Self:
    """
    Get the DAR from the specified dimensions and SAR.

    Args:
        width: The width of the image.
        height: The height of the image.
        sar: The SAR object. Optional.

    Returns:
        A DAR object created using the specified dimensions and SAR.
    """

    dar = Fraction(width, height)

    if sar:
        if sar.denominator > sar.numerator:
            dar /= sar
        else:
            dar *= sar

    return cls(dar)

def to_sar(self, active_area: int | Fraction, height: int) -> Sar:
    """
    Convert the DAR to a SAR object.

    Args:
        active_area: The active image area. For more information, see ``Sar.from_ar``.
        height: The height of the image.

    Returns:
        A SAR object created using the DAR.
    """

    assert isinstance(active_area, int | Fraction)

    return Sar.from_ar(active_area, height, self)

@classmethod
def from_video(cls, clip: vs.VideoNode) -> Self:
    """
    Create a Resolution object using a given clip's dimensions.
    """
    return cls(clip.width, clip.height)

def transpose(self) -> Self:
    """
    Flip the Resolution matrix over its diagonal.
    """
    return self.__class__(self.height, self.width)

def apply(self, clip: vs.VideoNode) -> vs.VideoNode:
    """
    Apply the SAR values as _SARNum and _SARDen frame properties to a clip.
    """

    return vs.core.std.SetFrameProps(clip, _SARNum=self.numerator, _SARDen=self.denominator)

@classmethod
def from_ar(cls, active_area: int | Fraction, height: int, dar: Dar) -> Self:
    """
    Calculate the SAR using a DAR object & active area. See ``Dar.to_sar`` for more information.

    For a list of known standards, refer to the following tables:
    `<https://docs.google.com/spreadsheets/d/1pzVHFusLCI7kys2GzK9BTk3w7G8zcLxgHs3DMsurF7g>`_

    Args:
        active_area: The active image area.
        height: The height of the image.
        dar: The DAR object.

    Returns:
        A SAR object created using DAR and active image area information.
    """

    assert isinstance(active_area, int | Fraction)

    return cls(dar / (Fraction(active_area) / height))

@classmethod
def from_clip(cls, clip: HoldsPropValue) -> Self:
    """
    Get the SAR from the clip's frame properties.

    Args:
        clip: Clip or frame that holds the frame properties.

    Returns:
        A SAR object of the SAR properties from the given clip.
    """

    from ..utils import get_prop

    return cls(get_prop(clip, "_SARNum", int, default=1), get_prop(clip, "_SARDen", int, default=1))

def ensure_presence(self, clip: vs.VideoNode) -> vs.VideoNode:
    """
    Ensures all the frame properties necessary for scene change detection are created.
    """
    from ..utils import merge_clip_props

    stats_clip = list[vs.VideoNode]()

    if self.is_SCXVID:
        if not hasattr(vs.core, "scxvid"):
            raise CustomRuntimeError(
                "You are missing scxvid!\n\tDownload it from https://github.com/dubhater/vapoursynth-scxvid",
                self.ensure_presence,
            )
        stats_clip.append(clip.scxvid.Scxvid())

    if self.is_WWXD:
        if not hasattr(vs.core, "wwxd"):
            raise CustomRuntimeError(
                "You are missing wwxd!\n\tDownload it from https://github.com/dubhater/vapoursynth-wwxd",
                self.ensure_presence,
            )
        stats_clip.append(clip.wwxd.WWXD())

    keys = tuple(self.prop_keys)

    expr = " ".join([f"x.{k}" for k in keys]) + (" and" * (len(keys) - 1))

    blank = clip.std.BlankClip(1, 1, vs.GRAY8, keep=True)

    if len(stats_clip) > 1:
        return merge_clip_props(blank, *stats_clip).akarin.Expr(expr)

    return blank.std.CopyFrameProps(stats_clip[0]).akarin.Expr(expr)

def lambda_cb(self) -> Callable[[int, vs.VideoFrame], SentinelT | int]:
    return lambda n, f: Sentinel.check(n, bool(f[0][0, 0]))

def prepare_clip(self, clip: vs.VideoNode, height: int | Literal[False] = 360) -> vs.VideoNode:
    """
    Prepare a clip for scene change metric calculations.

    The clip will always be resampled to YUV420 8bit if it's not already,
    as that's what the plugins support.

    Args:
        clip: Clip to process.
        height: Output height of the clip. Smaller frame sizes are faster to process, but may miss more scene
            changes or introduce more false positives. Width is automatically calculated. `False` means no resizing
            operation is performed. Default: 360.

    Returns:
        A prepared clip for performing scene change metric calculations on.
    """
    from ..utils import get_w

    if height:
        clip = clip.resize.Bilinear(get_w(height, clip), height, vs.YUV420P8)
    elif not clip.format or (clip.format and clip.format.id != vs.YUV420P8):
        clip = clip.resize.Bilinear(format=vs.YUV420P8)

    return self.ensure_presence(clip)