YouTube-video-downloader

Table of contents

• General Info
• Modules
• Files
• Functions

General Info

A YouTube video downloader that given a YouTube playlist does the following:

Functionality:

1. creates a .txt file that contains all the individual YouTube video URLs
2. extracts the audio signal from the videos as .wav
3. crops and saves into a new directory the audio signal into K-second segments
4. crops and saves into a new directory the video signal into K-second segments

Usage

$python3 preprocess_youtube.py <URL list> <path>

Example:

$python3 preprocess_youtube.py 'https://www.youtube.com/playlist?list=PLP28C3ZgpKBy8G5UqubZgDEI6-vx4LGWH' '/mnt/c/Users/Alekos/Desktop/youtube_videos' 

#where /youtube_videos is a directory that is going to be created

Modules

In order to download,extract the .wav files, crop the audio files and crop the optical files
you need to have following libraries installed in your system:

• pytube3
  
• natsort
  
• pydub

For pytube do:
sudo pip3 uninstall pytube
sudo pip3 install pytube3 --upgrade

Files

In order to achieve your goal to download and crop the signals we created two files named respectively:

1)preprocess_youtube.py
2)ffmpeg-split.py ->this file is called from cropVideo()
ffmpeg-split.py can be found here:c0decracker/video-splitter
3)video2Frames.py This file creates video frames, given a video signal

Functions

In the file named "preprocess_youtube.py" exist the following functions:

1)runBash(command)
	
2)DownloadVideo(URL,path)
      This function downloads the entire playlist from youtube to the directory where
      "preprocess_youtube.py" is. In addition it saves each individual youtube videoURL
      into a .txt file named ""video_URLs.txt"" 

3)getWAV(path)
  This function gets a video signal.mp4 and creates its audio signal.wav	

4)cropAudio(path): crop an audio signal into chunks of K seconds
  If you want to change the seconds change this variable: chunk_length_ms
  In addition this function creates a folder named "audio_segments" where
  the cropped audio files are saved. 

5)cropVideo(path): crop a video signal into chunks of K seconds
      If you need to change the seconds change -s K in the tmp variable
      #### Example: 
      change 'python2 /yourDirectory/video_segments/ffmpeg-split.py -f  -s 60' to 
      'python2 /yourDirectory/video_segments/ffmpeg-split.py -f  -s K'
      where K is the number of seconds.

      **DO NOT FORGET to set the directories especially for your system**

  #do not forget to include this part:
      #### /video_segments/auxiliary.py -f  -s 10
      tmp = 'python2 /yourDirectory/video_segments/ffmpeg-split.py -f  -s 60'
      #### Example:
      tmp = 'python2 /mnt/c/Users/Alekos/Desktop/video_segments/ffmpeg-split.py -f  -s 60'  

6)main()
      In this function we call every aforementioned function and get the user inputs 
      from the terminal

DISCLAIMER

Sometimes the cropVideo() does not work at first! You should comment that function call in main run the first three funtions, then comment the first three functions, and then uncomment cropVideo() in main() and run only cropVideo()