Quick and dirty script to get information about youtube videos and their URL (valid in october 2019)

get_yt_infos.py

!/usr/bin/env python3

# Libraries
import re
import sys
import json
import urllib.request
from urllib.parse import parse_qs

# Get video id from command line
if len(sys.argv) != 2:
    print("Usage: {} <video_id>".format(sys.argv[0]))
    exit(1)
vid = sys.argv[1]

# Format number of bytes in human-readable form
def sizeof_fmt(num, suffix='B'):
    for unit in ['','Ki','Mi','Gi','Ti','Pi','Ei','Zi']:
        if abs(num) < 1024.0:
            return "%3.1f%s%s" % (num, unit, suffix)
        num /= 1024.0
    return "%.1f%s%s" % (num, 'Yi', suffix)

# Load video infos from server (use cache for tests)
page_txt = ''
try:
    with open('videinfo_page.txt') as cache:
        page_txt = cache.read()
except IOError:
    print("Cache not found, download")
    url = 'https://youtube.com/get_video_info?video_id=' + vid
    user_agent = 'Mozilla/5.0 (X11; FreeBSD amd64; rv:40.0) Gecko/20100101 Firefox/40.0'
    req = urllib.request.Request(url, None, {'User-Agent': user_agent})
    with urllib.request.urlopen(req) as response:
        page_txt = response.read().decode("utf-8")
    with open('videinfo_page.txt', 'w') as cache:
        cache.write(page_txt)

# Parse interesting parts
pr = json.loads(parse_qs(page_txt)['player_response'][0])
formats = pr['streamingData']['adaptiveFormats'] + pr['streamingData']['formats']

# Sort formats
def fmt_sortkey(s):
    k = re.split('(\d+)', s['qualityLabel'] if 'qualityLabel' in s else s['quality'])
    if k[0] == '':
        k[0] = 1
        k[1] = int(k[1])
    else:
        k = [0, k[0]]
    return k
formats = sorted(formats, key=fmt_sortkey, reverse=True)

# There are a lot of useful information that may be shown in pr['videoDetails'] Let's show the title.
print(pr['videoDetails']['title'])

# Display found videos and set useful name
fmtlst = []
for f in formats:
    name = f['quality']
    if 'qualityLabel' in f:
        name = f['qualityLabel']
    if 'mimeType' in f:
        name += ' ' + f['mimeType'].split(';')[0]
    if 'contentLength' in f:
        name += ' ' + sizeof_fmt(int(f['contentLength']), 'B')
    print(name)
    print('=' * len(name))
    print(f['url'])
    print('')