VapourSynth script for "simple" frame exact cutting of video & audio

cutshit.vpy

import vapoursynth as vs
import csv
core = vs.get_core()	

if "input" not in dir():
	print("ERROR: Provide input file via --arg input=./spec.txt")
	assert False

vsrc = None
asrc = None
aout = "output.wav"
ranges = []


with open(input, 'r') as f:
	reader = csv.reader(f,
		delimiter=' ', escapechar='\\',
		quotechar='"', quoting=csv.QUOTE_MINIMAL,
		strict=True, skipinitialspace=False
	)
	for fields in reader:
		if len(fields) < 1: continue
		t = fields[0].lower()
		if t == "video":
			assert len(fields) == 2, "argument error"
			assert vsrc is None, "only one video source allowed"
			vsrc = fields[1]
		elif t == "audio":
			assert len(fields) == 2, "argument error"
			assert asrc is None, "only one video source allowed"
			asrc = fields[1]
		elif t == "aout":
			assert len(fields) == 2, "argument error"
			assert fields[1].split(".")[-1] in ("wav", "flac"), "invalid audio format"
			aout = fields[1]
		elif t == "frames":
			assert len(fields) == 3, "argument error"
			a, b = int(fields[1]), int(fields[2])
			assert b >= a, "end frame must be >= start frame"
			ranges.append((a, b))
		else:
			assert False, "unrecognized thingy"


assert vsrc is not None, "video source missing"
assert vsrc is not None, "audio source missing"
assert len(ranges) > 0, "no frame ranges given"


src = core.ffms2.Source(vsrc)
src = core.damb.Read(src, asrc)
out = None

for r in ranges:
	add = core.std.Trim(src, first=r[0], last=r[1])
	out = (add) if out is None else (out + add)

out = core.damb.Write(out, aout)
out.set_output()

example_config.txt

video "furry porn.mp4"
audio extracted_audio.wav
aout final_audio.flac # <- can be omitted (defaults to .wav format)

frames 582 1757
frames 3460 4617