Python: 调用youtube_dl实现视频下载

研究PySide与youtube_dl结合实现视频下载，抽丝剥蚕，步步维艰，却也颇有意思。

记录初始心得。界面以PySide之Qt编写，调用youtube_dl下载，回调出下载进度，代码如下：

# encoding: utf-8

from __future__ import unicode_literals
from PySide.QtGui import *
from PySide.QtCore import *
from main_ui import *
import youtube_dl
import threading

class MainWindow(QMainWindow, Ui_Main):
    update_info = Signal(dict)

    def __init__(self, parent=None):
        super(MainWindow, self).__init__(parent)

        self.setupUi(self)
        self.btnGet.setEnabled(False)
        self.txtUrl.setText('https://www.youtube.com/watch?v=dvSLaHj9VVM')
        self.update_info.connect(self.safe_hook_progress)

    def hook_progress(self, d):
        self.update_info.emit(d)

    def safe_hook_progress(self, d):
        info = ''
        if d['status'] == 'downloading':
            info = 'downloaded_bytes: ' + str(d['downloaded_bytes']) + ', elapsed: ' + str(
                d['elapsed']) + ', speed: ' + str(d['speed']) + ', filename: ' + d['filename'];
        elif d['status'] == 'finished':
            info = '
complete!'
            self.txtUrl.setEnabled(True)
            self.btnGet.setEnabled(True)
        if info != '':
            self.txtInfo.append(info)
            # self.txtInfo.setText(info)

    def get_opts(self):
        ydl_opts = {
            'format': 'bestvideo',
            # 'outtmpl': os.path.join(app.config['VIDEOS_FOLDER'], '%(id)s.%(ext)s'),
            # 'logger': MyLogger(),
            'progress_hooks': [self.hook_progress],
        }
        return ydl_opts

    def download(self, url):
        print 'download......', url
        if url.strip() == '':
            return

        ydl = youtube_dl.YoutubeDL(self.get_opts())
        ydl.download([url])

    @Slot()
    def on_txtUrl_returnPressed(self):
        if self.btnGet.isEnabled():
            self.btnGet.click()

    @Slot(str)
    def on_txtUrl_textChanged(self, s):
        self.btnGet.setEnabled(s != '')

    @Slot()
    def on_btnGet_clicked(self):
        self.txtUrl.setEnabled(False)
        self.btnGet.setEnabled(False)
        self.txtInfo.setText('')
        t = threading.Thread(target=MainWindow.download, args=(self, self.txtUrl.text()), name='thread')
        t.start()

效果如图所示：

参考：

youtube_dl

python脚本调用youtube-dl实现视频下载