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我試圖從網站下載並保存演講視頻。雖然我已成功下載文件，但他們不會在我的媒體播放器中播放。下面是我使用的代碼：使用Python下載* .mp4文件
from bs4 import BeautifulSoup
import re
import urllib2
snippet = open('Python/SNA Page Source Revised.txt', 'r')
soup = BeautifulSoup(snippet)
links = [link.get('href') for link in soup.find_all('a')]
videos = []
for link in links:
match = re.search('.*mp4.*', link)
if match:
videos.append(link)
vidNum = 1
for video in videos:
f = urllib2.urlopen(video)
with open('Data Analysis/Social Network Analysis/Video '+vidNum+'.mp4', 'wb') as code:
code.write(f.read())
vidNum += 1
一切似乎都做工精細，但當我嘗試播放的影片之一，我得到這個錯誤： 「巨蟒（V2.7）需要安裝插件播放以下類型的媒體文件：text/html decoder「此外，如果我手動從網站上下載視頻，該文件大約爲22.8MB，但是當我使用我的腳本時，文件僅爲7.8kB。
我在做我下載文件的方式有問題嗎？任何幫助將不勝感激。
另外：我在使用Python v2.7的Ubuntu 12.04 LTS操作系統上運行。
****編輯* ***
這是我收到的代碼我使用的是基於響應：
import requests
r = requests.get('https://class.coursera.org/sna-003/lecture/download.mp4?lecture_id=2', auth=('myUsername', 'myPassword'))
with open('Data Analysis/TestFile.mp4', 'wb') as fd:
fd.write(r.content)
這裏是r.content的輸出：
<!DOCTYPE html>
<html itemtype="http://schema.org" xmlns:fb="http://ogp.me/ns/fb#"><head><meta content="IE=Edge,chrome=IE7" http-equiv="X-UA-Compatible"/><meta content="!" name="fragment"/><meta content="NOODP" name="robots"/><meta charset="utf-8"/><meta content="Coursera" property="og:title"/><meta content="website" property="og:type"/><meta content="http://s3.amazonaws.com/coursera/media/Coursera_Computer_Narrow.png" property="og:image"/><meta content="https://www.coursera.org/" property="og:url"/><meta content="Coursera" property="og:site_name"/><meta content="en_US" property="og:locale"/><meta content="Take free online classes from 80+ top universities and organizations. Coursera is a social entrepreneurship company partnering with Stanford University, Yale University, Princeton University and others around the world to offer courses online for anyone to take, for free. We believe in connecting people to a great education so that anyone around the world can learn without limits." property="og:description"/><meta content="727836538,4807654" property="fb:admins"/><meta content="274998519252278" property="fb:app_id"/><meta content="Take free online classes from 80+ top universities and organizations. Coursera is a social entrepreneurship company partnering with Stanford University, Yale University, Princeton University and others around the world to offer courses online for anyone to take, for free. We believe in connecting people to a great education so that anyone around the world can learn without limits." name="description"/><meta content="http://s3.amazonaws.com/coursera/media/Coursera_Computer_Narrow.png" name="image"/><meta content="app-id=736535961" name="apple-itunes-app"/><script>window.onerror = function(message, url, lineNum) {
// First check the URL and line number of the error
url = url || window.location.href;
// 99% of the time, errors without line numbers arent due to our code,
// they are due to third party plugins and browser extensions
if (lineNum === undefined || lineNum == null) return;
// Now figure out the actual error message
// If it's an event, as triggered in several browsers
if (message.target && message.type) {
message = message.type;
}
if (!message.indexOf) {
message = 'Non-string, non-event error: ' + (typeof message);
}
var errorDescrip = {
message: message,
script: url,
line: lineNum,
url: document.URL
}
var err = {
key: 'page.error.javascript',
value: errorDescrip
}
window._204 = window._204 || [];
window._204.push(err);
window._gaq = window._gaq || [];
window._gaq.push(err);
}</script><title>Coursera.org</title><link href="https://d1rlkby5e91r2j.cloudfront.net/e47434615f57601f9b9ccaf255a589e8550d328d/css/home.css" rel="stylesheet" type="text/css"/><link href="https://d1rlkby5e91r2j.cloudfront.net/e47434615f57601f9b9ccaf255a589e8550d328d/pages/auth/css/auth.css" rel="stylesheet" type="text/css"/><script data-baseurl="https://d1rlkby5e91r2j.cloudfront.net/e47434615f57601f9b9ccaf255a589e8550d328d/" id="_mobile">(function(el) {
// Override certian behaviour if the page is for our mobile app.
// TODO(priya) Remove this conditional behaviour once I want to push this behaviour
// for regular authentication pages on mobile/smaller screens as well.
// Currently I'm keeping existing behaviour same and only adding mobile specific
// layouts ot /mobilesignup page (which is what isMobileApp = true signifies).
if ("false" == "true") {
var head = document.getElementsByTagName('head')[0];
// Add viewport meta tag
var viewport = document.querySelector('meta[name=viewport]');
var viewportContent = 'width=device-width, initial-scale=1.0, user-scalable=no';
if (!viewport) {
viewport = document.createElement('meta');
viewport.setAttribute('name', 'viewport');
head.appendChild(viewport);
}
viewport.setAttribute('content', viewportContent);
// Add responsive css
var link = document.createElement('link');
link.rel = 'stylesheet';
link.type = 'text/css';
link.href = el.getAttribute("data-baseurl") + "pages/auth/css/auth_responsive.css";
head.appendChild(link);
}
})(document.getElementById("_mobile"));
</script></head><body><div id="fb-root"></div><div id="origami"><div style="position:absolute;top:0px;left:0px;width:100%;height:100%;background:#f5f5f5;padding-top:5%;"><div id="coursera-loading-nojs" style="text-align:center; margin-bottom:10px;display:none;">Please use a <a href="/browsers">modern browser </a> with JavaScript enabled to use Coursera.</div><div><span id="coursera-loading-js" style="display: none; padding-left:45%">loading <img src="https://d2wvvaown1ul17.cloudfront.net/site-static/images/icons/loading.gif"/></span></div><noscript><div style="text-align:center; margin-bottom:10px;">Please use a <a href="/browsers">modern browser </a> with JavaScript enabled to use Coursera.</div></noscript></div></div><!--[if gte IE 8]><script>document.getElementById("coursera-loading-js").style.display = 'block';</script><![endif]-->
<!--[if lte IE 7]><script>document.getElementById("coursera-loading-nojs").style.display = 'block';
window._204 = window._204 || [];
window._gaq = window._gaq || [];
window._gaq.push(
['_setAccount', 'UA-28377374-1'],
['_setDomainName', window.location.hostname],
['_setAllowLinker', true],
['_trackPageview', window.location.pathname]);
window._204.push(
['client', 'home'],
{key:"pageview", value:window.location.pathname});
</script><script src="https://eventing.coursera.org/204.min.js"></script><script src="https://ssl.google-analytics.com/ga.js"></script><![endif]-->
<!--[if !IE]> --><script>document.getElementById("coursera-loading-js").style.display = 'block';</script><!-- <![endif]--><script src="https://d1rlkby5e91r2j.cloudfront.net/e47434615f57601f9b9ccaf255a589e8550d328d/js/core/require.js" type="text/javascript"></script><script data-baseurl="https://d1rlkby5e91r2j.cloudfront.net/e47434615f57601f9b9ccaf255a589e8550d328d/" data-debug="0" data-locale="" data-timestamp="1386838999742" data-version="e47434615f57601f9b9ccaf255a589e8550d328d" id="_require" type="text/javascript">if(document.getElementById("coursera-loading-js").style.display == 'block') {
(function(el) {
// prevent throw
require.onError = function(err) {
window._204 = window._204 || [];
window._204.push({key: 'requireErr', value: err});
};
define("pages/auth/authConfig",
function() {
return {"coursera_url": "https://www.coursera.org/",
"environment": "production"};
}
);
require.config({
enforceDefine: false,
waitSeconds: 14,
baseUrl: el.getAttribute("data-baseurl"),
urlArgs: el.getAttribute("data-debug") == "1" ? "v=" + el.getAttribute("data-timestamp") : "",
shim: {
"underscore": {
exports: '_'
},
"backbone": {
deps: ['underscore', 'jquery'],
exports: 'Backbone'
}
},
paths: {
"jquery": "js/core/jquery",
"underscore": "js/core/underscore",
"backbone": "js/core/backbone",
"i18n": "js/core/i18n._t"
},
callback: function() {
require(["pages/auth/routes"]); // bootup coursera
},
config: {
i18n: {
locale: (window.localStorage ? localStorage.getItem("locale") : '') || el.getAttribute("data-locale")
}
}
});
})(document.getElementById("_require"));
}</script><script type="text/javascript">define("pages/home/models/user.json", [], function(){
return null;
});
</script></body></html>
雖然我覺得這很奇怪，因爲它看起來像網站的源代碼，但是當我查看r.url時，我得到一個實際的網站，我可以在瀏覽器中加載它，並提示我保存或查看視頻。即使我嘗試傳遞我從中獲得的新網址（我假設它包含我的cookie信息），我仍然會收到相同的內容。我不明白我要去哪裏錯了。
你可能下載的下載頁面的HTML而不是文件本身。您是否在瀏覽器中嘗試過該網址？ –
是的，我有。以下是一個示例URL：https://class.coursera.org/sna-003/lecture/download.mp4?lecture_id=2 當我查看urllib2.urlopen（video）.read（）的輸出時，它是XML數據並且有一個數據庫，但該URL不能在瀏覽器中加載。這裏是一個例子：https：//d1rlkby5e91r2j.cloudfront.net/e47434615f57601f9b9ccaf255a589e8550d328d – brittenb
顯然你需要設置一些類型的cookie，以便下載不會失敗。 – plaes