ivtc ¶

def jivtc(
    src: vs.VideoNode, pattern: int, tff: bool = True, chroma_only: bool = True,
    postprocess: VSFunctionKwArgs = deblend, postdecimate: IVTCycles | None = IVTCycles.cycle_05,
    ivtc_cycle: IVTCycles = IVTCycles.cycle_10, final_ivtc_cycle: IVTCycles = IVTCycles.cycle_08,
    **kwargs: Any
) -> vs.VideoNode:
    """
    This function should only be used when a normal ivtc or ivtc + bobber leaves chroma blend to a every fourth frame.
    You can disable chroma_only to use in luma as well, but it is not recommended.

    :param src:             Source clip. Has to be 60i.
    :param pattern:         First frame of any clean-combed-combed-clean-clean sequence.
    :param tff:             Set top field first (True) or bottom field first (False).
    :param chroma_only:     Decide whether luma too will be processed.
    :param postprocess:     Function to run after second decimation. Should be either a bobber or a deblender.
    :param postdecimate:    If the postprocess function doesn't decimate itself, put True.

    :return:                Inverse Telecined clip.
    """

    InvalidFramerateError.check(jivtc, src, (30000, 1001))

    ivtced = core.std.SeparateFields(src, tff=tff).std.DoubleWeave()
    ivtced = ivtc_cycle.decimate(ivtced, pattern)

    pprocess = postprocess(src if postdecimate else ivtced, **kwargs)

    if postdecimate:
        pprocess = postdecimate.decimate(pprocess, pattern)

    inter = core.std.Interleave([ivtced, pprocess])
    final = final_ivtc_cycle.decimate(inter, pattern)

    final = join(ivtced, final) if chroma_only else final

    return FieldBased.ensure_presence(final, FieldBased.PROGRESSIVE)

def sivtc(
    clip: vs.VideoNode, pattern: int = 0, tff: bool | FieldBasedT = True, ivtc_cycle: IVTCycles = IVTCycles.cycle_10
) -> vs.VideoNode:
    """
    Simplest form of a fieldmatching function.

    This is essentially a stripped-down JIVTC offering JUST the basic fieldmatching and decimation part.
    As such, you may need to combine multiple instances if patterns change throughout the clip.

    :param clip:        Clip to process.
    :param pattern:     First frame of any clean-combed-combed-clean-clean sequence.
    :param tff:         Top-Field-First.

    :return:            IVTC'd clip.
    """

    tff = FieldBased.from_param(tff).field

    ivtc = clip.std.SeparateFields(tff=tff).std.DoubleWeave()
    ivtc = ivtc_cycle.decimate(ivtc, pattern)

    return FieldBased.PROGRESSIVE.apply(ivtc)

def vdecimate(clip: vs.VideoNode, weight: float = 0.0, **kwargs: Any) -> vs.VideoNode:
    """
    Perform frame decimation using VDecimate.

    This function uses VIVTC's VDecimate plugin to remove duplicate frames from telecined content.
    It's recommended to use the vfm function before running this.

    :param clip:            Input clip to decimate.
    :param weight:          Weight for frame blending. If > 0, blends duplicate frames before dropping one.
                            Default: 0.0 (frames are dropped, not blended).
    :param kwargs:          Additional keyword arguments to pass to VDecimate.
                            For a list of parameters, see the VIVTC documentation.

    :return:                Decimated clip with duplicate frames removed or blended.
    """

    func = FunctionUtil(clip, vdecimate, None, (vs.YUV, vs.GRAY), (8, 16))

    vdecimate_kwargs = dict[str, Any]()

    if block := kwargs.pop('block', None):
        if isinstance(block, int):
            vdecimate_kwargs |= dict(blockx=block, blocky=block)
        else:
            vdecimate_kwargs |= dict(blockx=block[0], blocky=block[1])

    if not kwargs.get('clip2', None) and func.work_clip.format is not clip.format:
        vdecimate_kwargs |= dict(clip2=clip)

    dryrun = kwargs.pop('dryrun', False)

    if dryrun or weight:
        stats = func.work_clip.vivtc.VDecimate(dryrun=True, **(vdecimate_kwargs | kwargs))

        if dryrun:
            return func.return_clip(stats)

        clip = kwargs.pop('clip2', clip)

        avg = clip.std.AverageFrames(weights=[0, 1 - weight, weight])
        splice = find_prop_rfs(clip, avg, "VDecimateDrop", "==", 1, stats)
        vdecimate_kwargs |= dict(clip2=splice)

    decimate = func.work_clip.vivtc.VDecimate(**(vdecimate_kwargs | kwargs))

    return func.return_clip(decimate)

def vfm(
    clip: vs.VideoNode, tff: FieldBasedT | None = None,
    mode: VFMMode = VFMMode.TWO_WAY_MATCH_THIRD_COMBED,
    postprocess: vs.VideoNode | VSFunctionNoArgs | None = None,
    **kwargs: Any
) -> vs.VideoNode:
    """
    Perform field matching using VFM.

    This function uses VIVTC's VFM plugin to detect and match pairs of fields in telecined content.

    You can pass a post-processing clip or function that will act on leftover combed frames.
    If you pass a clip, it will replace combed frames with that clip. If you pass a function,
    it will run that function on your input clip and replace combed frames with it.

    Example usage:

    .. code-block:: python

        # Run vsaa.Nnedi3 on combed frames
        >>> vfm(clip, postprocess=lambda x: Nnedi3().interpolate(x, double_y=False))

    :param clip:            Input clip to field matching telecine on.
    :param tff:             Field order of the input clip.
                            If None, it will be automatically detected.
    :param mode:            VFM matching mode. For more information, see :py:class:`VFMMode`.
                            Default: VFMMode.TWO_WAY_MATCH_THIRD_COMBED.
    :param postprocess:     Optional function or clip to process combed frames.
                            If a function is passed, it should take a clip as input and return a clip as output.
                            If a clip is passed, it will be used as the postprocessed clip.
    :param kwargs:          Additional keyword arguments to pass to VFM.
                            For a list of parameters, see the VIVTC documentation.

    :return:                Field matched clip with progressive frames.
    """

    func = FunctionUtil(clip, vfm, None, (vs.YUV, vs.GRAY), 8)

    tff = FieldBased.from_param_or_video(tff, clip, False, func.func)

    vfm_kwargs = dict[str, Any](
        order=tff.is_tff, mode=mode
    )

    if block := kwargs.pop('block', None):
        if isinstance(block, int):
            vfm_kwargs |= dict(blockx=block, blocky=block)
        else:
            vfm_kwargs |= dict(blockx=block[0], blocky=block[1])

    if (y := kwargs.pop('y', None)) and not isinstance(y, int):
        vfm_kwargs |= dict(y0=y[0], y1=y[1])

    if not kwargs.get('clip2', None) and func.work_clip.format is not clip.format:
        vfm_kwargs |= dict(clip2=clip)

    fieldmatch = func.work_clip.vivtc.VFM(**(vfm_kwargs | kwargs))

    if postprocess:
        if callable(postprocess):
            postprocess = postprocess(kwargs.get('clip2', clip))

        fieldmatch = find_prop_rfs(fieldmatch, postprocess, "_Combed", "==", 1)

    return func.return_clip(fieldmatch)