我正在尝试开发一个用于下载歌曲的小型应用程序
来自YouTube，分别为youtube_dl和kivy。
但是，当我按下下载按钮时，youtube_dl完成下载时屏幕冻结。下载完成后，屏幕才会再次变为“活动”状态。
有什么办法解决这个问题？我尝试了在pytube上可用的线程，但是在youtube_dl上无法正常工作。
from kivy.app import App
from kivy.uix.boxlayout import BoxLayout
from kivy.uix.textinput import TextInput
from kivy.uix.widget import Widget
from kivy.config import Config
from kivy.core.window import Window
from kivy.uix.label import Label
from kivy.uix.gridlayout import GridLayout
from kivy.lang import Builder
from kivy.base import runTouchApp
from kivy.uix.button import Button
from kivy.uix.anchorlayout import AnchorLayout
from kivy.uix.floatlayout import FloatLayout
from kivy.uix.dropdown import DropDown
from kivy.uix.image import AsyncImage
from kivy.uix.behaviors import ButtonBehavior
from kivy.properties import ObjectProperty, StringProperty
import requests
import pytube
from kivy.uix.popup import Popup
from kivy.uix.image import Image
from time import sleep
import youtube_dl
import threading
import os
from kivy.utils import get_color_from_hex
from kivy.clock import Clock
Window.fullscreen = False
Config.set('graphics', 'resizable', 1)
Config.set('graphics', 'width', '600')
Config.set('graphics', 'height', '700')
Config.write()
class YoutubeDownloader(BoxLayout):
link_ = ObjectProperty() # This is objectProperty which == Url TextInput
male = ObjectProperty()
def __init__(self, **kwargs):
super().__init__(**kwargs)
checkbox_is_active = ObjectProperty(False)
self.chck_state = 'normal' # Down if checked Normal if Uncheck
self.title = '' # Music title
self.thumbnail_url = '' #Music Image thumbnail url
self.playlist_urls = [] # This List conaints All Music Urls from playlist
self.playlist_size = 0
self.single_url = []
self.convert_return_value = 0 # if this variable = 1 it means convert finished succesfully
self.is_playlist = False
def checkbox_is_clicked(self):
'''This function Check state of checkbox'''
x = self.ids.chck_box.state
self.chck_state = x
return 1
def convert(self):
main_url = self.link_.text
if self.chck_state == 'normal':
try:
self.remove_widget(self.ids.music_name)
self.remove_widget(self.ids.img_button)
yt = pytube.YouTube(main_url)
self.title = yt.title
self.thumbnail_url = yt.thumbnail_url
self.single_url = main_url
music_name_label = self.ids.music_name
music_asyncImage = self.ids.img_button
music_asyncImage.source = self.thumbnail_url
music_name_label.text = self.title
self.convert_return_value = 1
self.is_playlist = False
except:
popwind = Popup(
title='Error!', content=Label(
text='Please Enter Valid Url or if its playlist\nplease click playlist checkkbutton\nand convert'), size_hint=(
0.8, 0.2))
popwind.open()
self.convert_return_value = 0
elif self.chck_state == 'down':
try:
self.ids.music_name.text = ''
self.ids.img_button.source = ''
playlist = pytube.Playlist(main_url)
playlist.populate_video_urls()
self.playlist_urls = playlist.video_urls
self.playlist_size = len(playlist.video_urls)
self.ids.music_name.text = 'Playlist size: {}'.format(self.playlist_size)
music_asyncImage = self.ids.img_button
music_asyncImage.source = pytube.YouTube(self.playlist_urls[0]).thumbnail_url
self.convert_return_value = 1
self.is_playlist = True
except:
popwind = Popup(
title='Error!', content=Label(
text='Please Enter Valid Url or if its Single song\nplease unclick playlist checkkbutton\nand convert'), size_hint=(
0.8, 0.2))
popwind.open()
self.convert_return_value = 0
def download_mp3(self):
if self.convert_return_value == 1 and self.is_playlist == False:
self.ids.music_name.text = 'Download In Progress Please Wait'
self.ids.img_button.source = ''
self.ids.img_button.anim_delay = 0
self.ids.img_button.source = 'download.gif'
try:
download = threading.Thread(target=self.download_video_mp3_mp4(self.link_.text, self.title))
download.start()
except:
pass
# try:
# download = threading.Thread(target=self.download_video_mp3_mp4(self.link_.text, 'test download'))
# download.start()
# except:
# pass
self.ids.music_name.text = 'Download Finished succesfully'
self.ids.img_button.source = 'down_complete.png'
elif self.convert_return_value == 0:
popwind = Popup(
title='Error!', content=Label(
text='Download is Not Ready!!\nPlease corectly fill all Fields and CheckBoxes'), size_hint=(
0.8, 0.2))
popwind.open()
def download_video_mp3_mp4(self, song_url, song_title): # For single song
# yt = pytube.YouTube(self.link_.text)
# yt.streams.first().download()
#
# self.ids.music_name.text = 'Download Finished succesfully'
# self.ids.img_button.source = 'down_complete.png'
"""
Download a song using youtube url and song title
"""
outtmpl = song_title + '.%(ext)s'
ydl_opts = {
'format': 'bestaudio/best',
'outtmpl': outtmpl,
'postprocessors': [
{'key': 'FFmpegExtractAudio','preferredcodec': 'mp3',
'preferredquality': '192',
},
{'key': 'FFmpegMetadata'},
],
}
youtube_dl.YoutubeDL(ydl_opts).extract_info(song_url, download=True)
# self.ids.music_name.text = 'Download Finished succesfully'
# self.ids.img_button.source = 'down_complete.png'
def download_video(self):
if self.convert_return_value == 1 and self.is_playlist == False:
pass
elif self.convert_return_value == 0:
popwind = Popup(
title='Error!', content=Label(
text='Download is Not Ready!!\nPlease corectly fill all Fields and CheckBoxes'), size_hint=(
0.8, 0.2))
popwind.open()
class KivyApp(App):
def build(self):
self.title = 'Youtube Downloader'
return YoutubeDownloader()
答案 0 :(得分：1)
您可以在 Kivy 中使用 Clock.schedule_once 函数。它基本上将进程延迟到下一帧。您可以在下载功能上使用它，并在下载时显示一些进度条或其他内容。您可以查看更多详情here