youtube-dl downloads videos way faster than pafy.

pafy-vs-youtube-dl.py

#!/usr/bin/python3

# results of a typical test:
# ytdl downloaded in 5.32s at 3.77 MB/s
# pafy downloaded in 786.6s at 0.03 MB/s

import pafy
import time
import youtube_dl
import sys
import glob
import os

def test_ytdl(url):
    ydl_opts = {
        'format': 'worstvideo[ext=webm]/worst[ext=webm]/worst',
        'outtmpl': 'youtube-dl__%(title)s-%(id)s.%(ext)s'
    }

    start = time.time()
    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        ydl.download([url])
    dl_time = time.time() - start
    paths = glob.glob(sys.path[0] + "/youtube-dl__*")
    dl_rate = os.path.getsize(paths[0]) / 1024 / 1024 / dl_time
    print("ytdl downloaded: " + str(paths[0]))
    print("ytdl downloaded in " + str(round(dl_time, 2)) + "s at " + str(round(dl_rate,2)) + " MB/s")


def test_pafy(url):
    p = pafy.new(url)
    for stream in p.videostreams:
        if str(stream) == "video:webm@256x144":
            size = stream.get_filesize()
            start = time.time()
            stream.download(filepath="pafy__" + stream.title + "." + stream.extension)
            dl_time = time.time() - start
            dl_rate = size / 1024 / 1024 / dl_time
            print(".")
            print("pafy downloaded in " + str(round(dl_time, 2)) + "s at " + str(round(dl_rate,2)) + " MB/s")
            print(".")

url = "https://www.youtube.com/watch?v=Yq7Eh6JTKIg"
test_ytdl(url)
test_pafy(url)