Batch VapourSynth & FFMPEG Python Script | Assumes `mpeg12.vpy` and `h264.vpy` scripts are next to it

batch_vs_ffmpeg.py

import os
import subprocess
from pathlib import Path

import click
from pymediainfo import MediaInfo


BASE_FFMPEG_ARGS = [
  "-nostats",
  "-colorspace", "bt709", "-color_primaries", "bt709", "-color_trc", "bt709", "-color_range", "1",
  "-c:v", "libx264",
  "-preset", "veryslow",
  "-psy-rd", "0.90:0",
  "-rc-lookahead", "120", "-me_range", "32", "-partitions", "p8x8,b8x8,i8x8,i4x4",
  "-mbtree", "0", "-fast-pskip", "0", "-aq-mode", "3",
  "-x264-params", "deadzone-inter=21:deadzone-intra=11"
]

SOURCE_ARGS = {
  "DVD": [
    "-level", "3.1",
    "-b:v", "6M", "-maxrate:v", "6M", "-bufsize:v", "10M",
    "-deblock", "-2:-2"
  ],
  "BD": [
    "-level", "4.1",
    "-b:v", "8M", "-maxrate:v", "8M", "-bufsize:v", "16M",
    "-deblock", "-3:-3"
  ]
}

@click.command()
@click.argument("files", type=Path)
@click.option("-r", "--resolution", type=int, default=None)
@click.argument("source", type=click.Choice(["DVD", "BD"]))
@click.option("-o", "--output", type=Path, default=Path("P:/"))
def main(files: Path, source: str, resolution: int, output: Path):
  # append source to output folder
  output = output / source

  # make sure output folder exists
  output.mkdir(parents=True, exist_ok=True)

  # add source-specific settings to ffmpeg
  ffmpeg_args = BASE_FFMPEG_ARGS + SOURCE_ARGS[source]

  if resolution:
    ffmpeg_args.extend([
      "-vf", f"scale={resolution}:-2:flags=spline"
    ])

  # get vpy script path
  vpy_script = Path(__file__).parent / {
    "DVD": "mpeg12.vpy",
    "BD": "h264.vpy"
  }[source]

  if files.is_dir():
    files = files.glob("*.mkv")
  else:
    files = [files]

  for mkv in files:
    # get input file media info
    mi = MediaInfo.parse(mkv)

    aspect_ratio = mi.video_tracks[0].other_display_aspect_ratio[0]
    if aspect_ratio.endswith(":1"):
      # ffmpeg doesnt like n:1 ratios, so supply as decimal/int
      aspect_ratio = aspect_ratio.split(":")[0]

    # initialize the script
    # this is to skip the mkvextract and so on stdout
    vspipe_init = subprocess.Popen([
      "vspipe",
      "-c", "y4m",
      "--end", "0",
      "--arg", f"source={str(mkv)}",
      str(vpy_script), "-"
    ], stdout=open(os.devnull, "w"))
    vspipe_init.wait()

    vspipe = subprocess.Popen([
      "vspipe",
      "-c", "y4m",
      "--arg", f"source={str(mkv)}",
      str(vpy_script), "-"
    ], stdout=subprocess.PIPE)

    ffmpeg = subprocess.Popen([
      "ffmpeg", "-y",
      "-vn", "-sn", "-i", str(mkv),
      "-i", "-",
      *ffmpeg_args,
      "-aspect", aspect_ratio,
      "-c:a", "ac3",
      "-b:a", "448k",
      str((output / mkv.name).with_suffix(".mkv"))
    ], stdin=vspipe.stdout)
    vspipe.stdout.close()
    ffmpeg.communicate()

  # delete all LWI files (index files)
  if source == "BD":
    for lwi in Path(__file__).parent.glob("*.lwi"):
      lwi.unlink()


if __name__ == "__main__":
  main()

h264.py

import vapoursynth as vs
from vapoursynth import core

from functools import partial

from pvsfunc import PLWI
from havsfunc import QTGMC


# example script to use pvsfunc.PLWI to get a progressive stream.
# this does not deal with VFR at all.

# `source` variable should be set via vs-pipe, if not, manually set it
# source = r"C:\Users\John\title_t01.mkv"

clip = PLWI(source, verbose=False).\
        deinterlace(kernel=partial(QTGMC, FPSDivisor=2, Preset="Very Slow"), verbose=False).\
        clip

clip.set_output()

mpeg12.py

import vapoursynth as vs
from vapoursynth import core

from functools import partial

from pvsfunc import PD2V
from havsfunc import QTGMC


# example script to use pvsfunc.PD2V to get a CFR ceiled progressive stream.

# `source` variable should be set via vs-pipe, if not, manually set it
# source = r"C:\Users\John\title_t01.mkv"

clip = PD2V(source, verbose=False).\
	ceil().\
	deinterlace(kernel=partial(QTGMC, FPSDivisor=2, Preset="Very Slow"), verbose=False).\
	clip

clip.set_output()