text: #!/usr/bin/env python
  # PYTHON_ARGCOMPLETE_OK
  import subprocess
  from audiotsm.io.wav import WavReader, WavWriter
  from scipy.io import wavfile
  import numpy as np
  import re
  import math
  from shutil import rmtree, move, copyfile
  import os
  import argparse
  from pytube import YouTube
  from time import time
  import distutils.util
  import tempfile
  
  
  def safe_remove(path):
      try:
          os.remove(path)
          return True
      except OSError:
          return False
  
  
  def downloadFile(url):
      sep = os.path.sep
      originalPath = YouTube(url).streams.first().download()
      filepath = originalPath.split(sep)
      filepath[-1] = filepath[-1].replace(' ', '_')
      filepath = sep.join(filepath)
      os.rename(originalPath, filepath)
      return filepath
  
  
  def getFrameRate(path):
      process = subprocess.Popen(
          ["ffmpeg", "-i", path], stdout=subprocess.PIPE, stderr=subprocess.STDOUT)
      stdout, _ = process.communicate()
      output = stdout.decode()
      match_dict = re.search(r"\s(?P<fps>[\d\.]+?)\stbr", output).groupdict()
      return float(match_dict["fps"])
  
  
  def getMaxVolume(s):
      maxv = float(np.max(s))
      minv = float(np.min(s))
      return max(maxv, -minv)
  
  
  def copyFrame(inputFrame, outputFrame):
      src = TEMP_FOLDER+"/frame{:06d}".format(inputFrame+1)+".jpg"
      dst = TEMP_FOLDER+"/newFrame{:06d}".format(outputFrame+1)+".jpg"
      if not os.path.isfile(src):
          return False
      copyfile(src, dst)
      # Remove unneeded frames
      inputFrame -= 1
      src = TEMP_FOLDER+"/frame{:06d}".format(inputFrame+1)+".jpg"
      while safe_remove(src):
          inputFrame -= 1
          src = TEMP_FOLDER+"/frame{:06d}".format(inputFrame+1)+".jpg"
      return True
  
  
  def inputToOutputFilename(filename):
      dotIndex = filename.rfind(".")
      return filename[:dotIndex]+"_ALTERED"+filename[dotIndex:]
  
  
  def createPath(s):
      #assert (not os.path.exists(s)), "The filepath "+s+" already exists. Don't want to overwrite it. Aborting."
  
      try:
          os.mkdir(s)
      except OSError:
          assert False, "Creation of the directory %s failed. (The TEMP folder may already exist. Delete or rename it, and try again.)"
  
  
  def deletePathAndExit(s, msg="", rc=0):  # Dangerous! Watch out!
      try:
          rmtree(s, ignore_errors=False)
          print(msg)
      except OSError:
          print("Deletion of the directory %s failed" % s)
          print(OSError)
  
  
  def writeELD(start, end, number):
      startFrame = int(start % frameRate)
      startSecond = int((start / frameRate) % 60)
      startMinute = int((start / frameRate / 60) % 60)
      startHour = int((start / frameRate / 60 / 60))
      endFrame = int(end % frameRate)
      endSecond = int((end / frameRate) % 60)
      endMinute = int((end / frameRate / 60) % 60)
      endHour = int((end / frameRate / 60 / 60))
      eld_file = open(OUTPUT_FILE, "a")
      eld_file.write("{0} 001 V C {4}:{3}:{2}:{1} {8}:{7}:{6}:{5} {4}:{3}:{2}:{1} {8}:{7}:{6}:{5}\r\n".format(
          str(number).zfill(3),
          str(startFrame).zfill(2),
          str(startSecond).zfill(2),
          str(startMinute).zfill(2),
          str(startHour).zfill(2),
          str(endFrame).zfill(2),
          str(endSecond).zfill(2),
          str(endMinute).zfill(2),
          str(endHour).zfill(2)
      ))
      eld_file.close()
  
  
  parser = argparse.ArgumentParser(
      description='Modifies a video file to play at different speeds when there is sound vs. silence.')
  parser.add_argument('-i', '--input_file', type=str,
                      help='the video file you want modified')
  parser.add_argument('-u', '--url', type=str,
                      help='A youtube url to download and process')
  parser.add_argument('-o', '--output_file', type=str, default="",
                      help="the output file. (optional. if not included, it'll just modify the input file name)")
  parser.add_argument('-f', '--force', default=False,
                      action='store_true', help='Overwrite output_file without asking')
  parser.add_argument('-t', '--silent_threshold', type=float, default=0.03,
                      help="the volume amount that frames' audio needs to surpass to be consider \"sounded\". It ranges from 0 (silence) to 1 (max volume)")
  parser.add_argument('-snd', '--sounded_speed', type=float, default=1.00,
                      help="the speed that sounded (spoken) frames should be played at. Typically 1.")
  parser.add_argument('-sil', '--silent_speed', type=float, default=5.00,
                      help="the speed that silent frames should be played at. 999999 for jumpcutting.")
  parser.add_argument('-fm', '--frame_margin', type=float, default=1,
                      help="some silent frames adjacent to sounded frames are included to provide context. How many frames on either the side of speech should be included? That's this variable.")
  parser.add_argument('-sr', '--sample_rate', type=float, default=44100,
                      help="sample rate of the input and output videos")
  parser.add_argument('-fr', '--frame_rate', type=float,
                      help="frame rate of the input and output videos. optional... I try to find it out myself, but it doesn't always work.")
  parser.add_argument('-fq', '--frame_quality', type=int, default=3,
                      help="quality of frames to be extracted from input video. 1 is highest, 31 is lowest, 3 is the default.")
  parser.add_argument('-p', '--preset', type=str, default="medium",
                      help="A preset is a collection of options that will provide a certain encoding speed to compression ratio. See https://trac.ffmpeg.org/wiki/Encode/H.264")
  parser.add_argument('-crf', '--crf', type=int, default=23,
                      help="Constant Rate Factor (CRF). Lower value - better quality but large filesize. See https://trac.ffmpeg.org/wiki/Encode/H.264")
  parser.add_argument('-alg', '--stretch_algorithm', type=str, default="wsola",
                      help="Sound stretching algorithm. 'phasevocoder' is best in general, but sounds phasy. 'wsola' may have a bit of wobble, but sounds better in many cases.")
  parser.add_argument('-a', '--audio_only', default=False,
                      action='store_true', help="outputs an audio file")
  parser.add_argument('-edl', '--edl', default=False, action='store_true',
                      help='EDL export option. (Supports only cuts off)')
  
  try:  # If you want bash completion take a look at https://pypi.org/project/argcomplete/
      import argcomplete
      argcomplete.autocomplete(parser)
  except ImportError:
      pass
  args = parser.parse_args()
  
  
  frameRate = args.frame_rate
  SAMPLE_RATE = args.sample_rate
  SILENT_THRESHOLD = args.silent_threshold
  FRAME_SPREADAGE = args.frame_margin
  AUDIO_ONLY = args.audio_only
  NEW_SPEED = [args.silent_speed, args.sounded_speed]
  if args.url != None:
      INPUT_FILE = downloadFile(args.url)
  else:
      INPUT_FILE = args.input_file
  URL = args.url
  FRAME_QUALITY = args.frame_quality
  EDL = args.edl
  FORCE = args.force
  H264_PRESET = args.preset
  H264_CRF = args.crf
  
  STRETCH_ALGORITHM = args.stretch_algorithm
  if(STRETCH_ALGORITHM == "phasevocoder"):
      from audiotsm import phasevocoder as audio_stretch_algorithm
  elif (STRETCH_ALGORITHM == "wsola"):
      from audiotsm import wsola as audio_stretch_algorithm
  else:
      raise Exception("Unknown audio stretching algorithm.")
  
  assert INPUT_FILE != None, "why u put no input file, that dum"
  assert os.path.isfile(INPUT_FILE), "I can't read/find your input file"
  assert FRAME_QUALITY < 32, "The max value for frame quality is 31."
  assert FRAME_QUALITY > 0, "The min value for frame quality is 1."
  
  if len(args.output_file) >= 1:
      OUTPUT_FILE = args.output_file
  else:
      OUTPUT_FILE = inputToOutputFilename(INPUT_FILE)
  
  if FORCE:
      safe_remove(OUTPUT_FILE)
  else:
      if os.path.isfile(OUTPUT_FILE):
          if distutils.util.strtobool(input(f"Do you want to overwrite {OUTPUT_FILE}? (y/n)")):
              safe_remove(OUTPUT_FILE)
          else:
              exit(0)
  
  # TEMP_FOLDER = tempfile.TemporaryDirectory()
  TEMP_FOLDER = "temp_frames_"+str(math.floor(time()*1000))
  # smooth out transitiion's audio by quickly fading in/out (arbitrary magic number whatever)
  AUDIO_FADE_ENVELOPE_SIZE = 400
  
  createPath(TEMP_FOLDER)
  
  if not (AUDIO_ONLY or EDL):
      command = ["ffmpeg", "-i", INPUT_FILE, "-qscale:v",
                 str(FRAME_QUALITY), TEMP_FOLDER+"/frame%06d.jpg", "-hide_banner"]
      rc = subprocess.run(command)
      if rc.returncode != 0:
          deletePathAndExit(
              TEMP_FOLDER, "The input file doesn't have any video. Try --audio_only", rc.returncode)
  
  command = ["ffmpeg", "-i", INPUT_FILE, "-ab", "160k", "-ac", "2",
             "-ar", str(SAMPLE_RATE), "-vn", TEMP_FOLDER+"/audio.wav"]
  rc = subprocess.run(command)
  if rc.returncode != 0:
      deletePathAndExit(
          TEMP_FOLDER, "The input file doesn't have any sound.", rc.returncode)
  
  sampleRate, audioData = wavfile.read(TEMP_FOLDER+"/audio.wav")
  audioSampleCount = audioData.shape[0]
  maxAudioVolume = getMaxVolume(audioData)
  
  if frameRate is None:
      try:
          frameRate = getFrameRate(INPUT_FILE)
      except AttributeError:
          if AUDIO_ONLY:
              frameRate = 1
          else:
              deletePathAndExit(
                  TEMP_FOLDER, "Couldn't detect a framerate.", rc.returncode)
  
  samplesPerFrame = sampleRate/frameRate
  
  audioFrameCount = int(math.ceil(audioSampleCount/samplesPerFrame))
  
  hasLoudAudio = np.zeros((audioFrameCount))
  
  
  for i in range(audioFrameCount):
      start = int(i*samplesPerFrame)
      end = min(int((i+1)*samplesPerFrame), audioSampleCount)
      audiochunks = audioData[start:end]
      maxchunksVolume = float(getMaxVolume(audiochunks))/maxAudioVolume
      if maxchunksVolume >= SILENT_THRESHOLD:
          hasLoudAudio[i] = 1
  
  chunks = [[0, 0, 0]]
  shouldIncludeFrame = np.zeros((audioFrameCount))
  for i in range(audioFrameCount):
      start = int(min(max(0, i-FRAME_SPREADAGE), audioFrameCount))
      end = int(max(0, min(audioFrameCount, i+1+FRAME_SPREADAGE)))
      if(start > end):
          end = start+1
          if(end > audioFrameCount):
              continue
      shouldIncludeFrame[i] = np.max(hasLoudAudio[start:end])
      # Did we flip?
      if (i >= 1 and shouldIncludeFrame[i] != shouldIncludeFrame[i-1]):
          chunks.append([chunks[-1][1], i, shouldIncludeFrame[i-1]])
  
  chunks.append([chunks[-1][1], audioFrameCount, shouldIncludeFrame[i-1]])
  chunks = chunks[1:]
  outputAudioData = []
  outputPointer = 0
  
  # Create audio envelope mask
  mask = [x/AUDIO_FADE_ENVELOPE_SIZE for x in range(AUDIO_FADE_ENVELOPE_SIZE)]
  
  lastExistingFrame = None
  if EDL:
      edlFrameNumber = 0
  
  for chunk in chunks:
      if EDL:
          if (chunk[2] == True):
              edlFrameNumber += 1
              writeELD(chunk[0], chunk[1], edlFrameNumber)
          continue
      audioChunk = audioData[int(chunk[0]*samplesPerFrame)
                                 :int(chunk[1]*samplesPerFrame)]
  
      sFile = TEMP_FOLDER+"/tempStart.wav"
      eFile = TEMP_FOLDER+"/tempEnd.wav"
      wavfile.write(sFile, SAMPLE_RATE, audioChunk)
      with WavReader(sFile) as reader:
          with WavWriter(eFile, reader.channels, reader.samplerate) as writer:
              tsm = audio_stretch_algorithm(
                  reader.channels, speed=NEW_SPEED[int(chunk[2])])
              tsm.run(reader, writer)
      _, alteredAudioData = wavfile.read(eFile)
      leng = alteredAudioData.shape[0]
      endPointer = outputPointer+leng
      outputAudioData.extend((alteredAudioData/maxAudioVolume).tolist())
  
      # Smoothing the audio
      if leng < AUDIO_FADE_ENVELOPE_SIZE:
          for i in range(outputPointer, endPointer):
              outputAudioData[i] = 0
      else:
          for i in range(outputPointer, outputPointer+AUDIO_FADE_ENVELOPE_SIZE):
              outputAudioData[i][0] *= mask[i-outputPointer]
              outputAudioData[i][1] *= mask[i-outputPointer]
          for i in range(endPointer-AUDIO_FADE_ENVELOPE_SIZE, endPointer):
              outputAudioData[i][0] *= (1-mask[i -
                                               endPointer+AUDIO_FADE_ENVELOPE_SIZE])
              outputAudioData[i][1] *= (1-mask[i -
                                               endPointer+AUDIO_FADE_ENVELOPE_SIZE])
      if not AUDIO_ONLY:
          startOutputFrame = int(math.ceil(outputPointer/samplesPerFrame))
          endOutputFrame = int(math.ceil(endPointer/samplesPerFrame))
          for outputFrame in range(startOutputFrame, endOutputFrame):
              inputFrame = int(chunk[0]+NEW_SPEED[int(chunk[2])]
                               * (outputFrame-startOutputFrame))
              didItWork = copyFrame(inputFrame, outputFrame)
              if outputFrame % 1000 == 999:
                  print(str(inputFrame + 1) + "/" + str(audioFrameCount) +
                        " frames processed.", end="\r", flush=True)
              if didItWork:
                  lastExistingFrame = inputFrame
              else:
                  copyFrame(lastExistingFrame, outputFrame)
      outputPointer = endPointer
  
  outputAudioData = np.asarray(outputAudioData)
  if not EDL:
      wavfile.write(TEMP_FOLDER+"/audioNew.wav", SAMPLE_RATE, outputAudioData)
  
  '''
  outputFrame = math.ceil(outputPointer/samplesPerFrame)
  for endGap in range(outputFrame,audioFrameCount):
      copyFrame(int(audioSampleCount/samplesPerFrame)-1,endGap)
  '''
  if not EDL:
      if AUDIO_ONLY:
          command = ["ffmpeg", "-i", TEMP_FOLDER+"/audioNew.wav", OUTPUT_FILE]
      else:
          command = ["ffmpeg", "-framerate", str(frameRate), "-i", TEMP_FOLDER+"/newFrame%06d.jpg", "-i", TEMP_FOLDER +
                     "/audioNew.wav", "-strict", "-2", "-c:v", "libx264", "-preset", str(H264_PRESET), "-crf", str(H264_CRF), "-pix_fmt", "yuvj420p", OUTPUT_FILE]
      rc = subprocess.run(command)
      if rc.returncode != 0:
          deletePathAndExit(TEMP_FOLDER, rc, rc.returncode)
  
  deletePathAndExit(TEMP_FOLDER)
  