7
我想弄清楚如何從YouTube上下載視頻到本地文件系統。我已經嘗試了幾個軟件包，如vGet，但似乎無法使它工作。任何幫助深表感謝。如何用java下載Youtube視頻
A
回答
10
我試過vget， https://github.com/axet/vget（已經搬到https://gitlab.com/axet/vget） 它工作正常。 您可以使用maven來設置或從pom文件手動下載依賴項。 依賴性是
的wget（https://github.com/axet/wget）
公地-IO-2.4.jar
公地lang3-3.1.jar
的HttpCore-4.3.jar
httpclient-4.3.jar
的XStream-1.4.2.jar
編譯JDK6
跑直接下載樣品，
public class DirectDownload {
public static void main(String[] args) {
try {
VGet v = new VGet(new URL("http://www.youtube.com/watch?v=fNU4UNPNeWI"), new File("/"));
v.download();
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
檢查了準備工作的例子，來源包括在罐子
更新＃- 在評論
tldr提到下載時NPE問題;似乎有幾個問題與com.github.axet.vget.vhs.YouTubeParser，因此添加了非侵入代碼來修補它，並使示例工作與以前一樣。因此，只需將最初的YoutubeParser類替換爲最後發佈的類即可。
另外找到另一個現成的工作示例與jar和所有必需的庫，包括在罐子裏的來源（這將在一段時間後自動刪除（將於2014年9月13日刪除） - 包括youtube網址在代碼是隨機的）
zip文件 - 1,69MB（wetransfer.com顯示器1.7MB）
A.問題
在com.github.axet.vget.vhs.YouTubeParser LN229變量
qs最不包含在HTTP的結果查詢字符串獲取與WGet執行的時間。這會導致稍後嘗試解析查詢字符串時引發npe。如果問題1得到解決，那麼在
get_video_info返回的網址中找不到sig變量，因此使用Pattern.compile("sig=([^&,]*)")解析不會返回任何值。這會導致連續重試，而無需下載視頻。
B.決議（這些都是暫時貼劑，作爲響應的原始格式和wget行爲不當的原因是未知的）
- 調用
WGet再次，如果結果查詢字符串是空的，沒有一個WGet.HtmlLoader似乎做的工作。還提供了使用apache httpclient v4調用簡單HTTP GET的方法，在這種情況下，還有一個依賴於apache commons-logging.jar。
加入ln248
if (qs == null || qs.trim().length() == 0) {
qs = WGet.getHtml(url);
////below is sample code for simple HTTP GET with httpclient v4
////if used then apache commons-logging.jar is also required
// CloseableHttpClient httpclient = HttpClients.createDefault();
// try {
// HttpGet httpget = new HttpGet(get);
//
// System.out.println("Executing request " + httpget.getRequestLine());
//
// // Create a custom response handler
// ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
//
// public String handleResponse(
// final HttpResponse response) throws ClientProtocolException, IOException {
// int status = response.getStatusLine().getStatusCode();
// if (status >= 200 && status < 300) {
// HttpEntity entity = response.getEntity();
// return entity != null ? EntityUtils.toString(entity) : null;
// } else {
// throw new ClientProtocolException("Unexpected response status: " + status);
// }
// }
//
// };
// String responseBody = httpclient.execute(httpget, responseHandler);
// qs = responseBody;
// } finally {
// httpclient.close();
// }
}
2.After看的響應似乎是在某個地方的簽名，所以提高了解析位。因此，如果Pattern.compile("sig=([^&,]*)")的模式執行不返回任何內容，那麼也嘗試使用Pattern.compile("signature%3D([^&,%]*)")。此更改發生在方法extractUrlEncodedVideos中。
String sig = null;
{
Pattern link = Pattern.compile("signature=([^&,]*)");
Matcher linkMatch = link.matcher(urlString);
if (linkMatch.find()) {
sig = linkMatch.group(1);
} else {
link = Pattern.compile("signature%3D([^&,%]*)");
linkMatch = link.matcher(urlString);
if (linkMatch.find()) {
sig = linkMatch.group(1);
}
}
}
修改後的com.github.axet.vget.vhs.YouTubeParser文件如下，
package com.github.axet.vget.vhs;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URISyntaxException;
import java.net.URL;
import java.net.URLDecoder;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.concurrent.atomic.AtomicBoolean;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import org.apache.commons.lang3.StringEscapeUtils;
import org.apache.commons.lang3.StringUtils;
import org.apache.http.NameValuePair;
import org.apache.http.client.utils.URLEncodedUtils;
import com.github.axet.vget.info.VGetParser;
import com.github.axet.vget.info.VideoInfo;
import com.github.axet.vget.info.VideoInfo.States;
import com.github.axet.vget.info.VideoInfo.VideoQuality;
import com.github.axet.wget.WGet;
import com.github.axet.wget.info.ex.DownloadError;
import java.io.IOException;
import org.apache.http.HttpEntity;
import org.apache.http.HttpResponse;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.ResponseHandler;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;
import org.apache.http.util.EntityUtils;
public class YouTubeParser extends VGetParser {
public static class VideoUnavailablePlayer extends DownloadError {
private static final long serialVersionUID = 10905065542230199L;
public VideoUnavailablePlayer() {
super("unavailable-player");
}
}
public static class AgeException extends DownloadError {
private static final long serialVersionUID = 1L;
public AgeException() {
super("Age restriction, account required");
}
}
public static class PrivateVideoException extends DownloadError {
private static final long serialVersionUID = 1L;
public PrivateVideoException() {
super("Private video");
}
public PrivateVideoException(String s) {
super(s);
}
}
public static class EmbeddingDisabled extends DownloadError {
private static final long serialVersionUID = 1L;
public EmbeddingDisabled(String msg) {
super(msg);
}
}
public static class VideoDeleted extends DownloadError {
private static final long serialVersionUID = 1L;
public VideoDeleted(String msg) {
super(msg);
}
}
List<VideoDownload> sNextVideoURL = new ArrayList<VideoDownload>();
URL source;
public YouTubeParser(URL input) {
this.source = input;
}
public static boolean probe(URL url) {
return url.toString().contains("youtube.com");
}
void downloadone(VideoInfo info, AtomicBoolean stop, Runnable notify) throws Exception {
try {
extractEmbedded(info, stop, notify);
} catch (EmbeddingDisabled e) {
streamCpature(info, stop, notify);
}
}
/**
* do not allow to download age restricted videos
*
* @param info
* @param stop
* @param notify
* @throws Exception
*/
void streamCpature(final VideoInfo info, final AtomicBoolean stop, final Runnable notify) throws Exception {
String html;
html = WGet.getHtml(info.getWeb(), new WGet.HtmlLoader() {
@Override
public void notifyRetry(int delay, Throwable e) {
info.setDelay(delay, e);
notify.run();
}
@Override
public void notifyDownloading() {
info.setState(States.DOWNLOADING);
notify.run();
}
@Override
public void notifyMoved() {
info.setState(States.RETRYING);
notify.run();
}
}, stop);
extractHtmlInfo(info, html, stop, notify);
extractIcon(info, html);
}
/**
* Add resolution video for specific youtube link.
*
* @param url download source url
* @throws MalformedURLException
*/
void addVideo(String itag, String url) throws MalformedURLException {
Integer i = Integer.decode(itag);
VideoQuality vd = itagMap.get(i);
URL u = new URL(url);
if (u != null) {
sNextVideoURL.add(new VideoDownload(vd, u));
}
}
// http://en.wikipedia.org/wiki/YouTube#Quality_and_codecs
static final Map<Integer, VideoQuality> itagMap = new HashMap<Integer, VideoInfo.VideoQuality>() {
private static final long serialVersionUID = -6925194111122038477L;
{
put(120, VideoQuality.p720);
put(102, VideoQuality.p720);
put(101, VideoQuality.p360);
put(100, VideoQuality.p360);
put(85, VideoQuality.p520);
put(84, VideoQuality.p720);
put(83, VideoQuality.p240);
put(82, VideoQuality.p360);
put(46, VideoQuality.p1080);
put(45, VideoQuality.p720);
put(44, VideoQuality.p480);
put(43, VideoQuality.p360);
put(38, VideoQuality.p3072);
put(37, VideoQuality.p1080);
put(36, VideoQuality.p240);
put(35, VideoQuality.p480);
put(34, VideoQuality.p360);
put(22, VideoQuality.p720);
put(18, VideoQuality.p360);
put(17, VideoQuality.p144);
put(6, VideoQuality.p270);
put(5, VideoQuality.p240);
}
};
public static String extractId(URL url) {
{
Pattern u = Pattern.compile("youtube.com/watch?.*v=([^&]*)");
Matcher um = u.matcher(url.toString());
if (um.find()) {
return um.group(1);
}
}
{
Pattern u = Pattern.compile("youtube.com/v/([^&]*)");
Matcher um = u.matcher(url.toString());
if (um.find()) {
return um.group(1);
}
}
return null;
}
/**
* allows to download age restricted videos
*
* @param info
* @param stop
* @param notify
* @throws Exception
*/
void extractEmbedded(final VideoInfo info, final AtomicBoolean stop, final Runnable notify) throws Exception {
String id = extractId(source);
if (id == null) {
throw new RuntimeException("unknown url");
}
info.setTitle(String.format("http://www.youtube.com/watch?v=%s", id));
String get = String
.format("http://www.youtube.com/get_video_info?video_id=%s&el=embedded&ps=default&eurl=", id);
URL url = new URL(get);
String qs = WGet.getHtml(url, new WGet.HtmlLoader() {
@Override
public void notifyRetry(int delay, Throwable e) {
info.setDelay(delay, e);
notify.run();
}
@Override
public void notifyDownloading() {
info.setState(States.DOWNLOADING);
notify.run();
}
@Override
public void notifyMoved() {
info.setState(States.RETRYING);
notify.run();
}
}, stop);
if (qs == null || qs.trim().length() == 0) {
qs = WGet.getHtml(url);
////below is sample code for simple HTTP GET with httpclient v4
////if used then apache commons-logging.jar is also required
// CloseableHttpClient httpclient = HttpClients.createDefault();
// try {
// HttpGet httpget = new HttpGet(get);
//
// System.out.println("Executing request " + httpget.getRequestLine());
//
// // Create a custom response handler
// ResponseHandler<String> responseHandler = new ResponseHandler<String>() {
//
// public String handleResponse(
// final HttpResponse response) throws ClientProtocolException, IOException {
// int status = response.getStatusLine().getStatusCode();
// if (status >= 200 && status < 300) {
// HttpEntity entity = response.getEntity();
// return entity != null ? EntityUtils.toString(entity) : null;
// } else {
// throw new ClientProtocolException("Unexpected response status: " + status);
// }
// }
//
// };
// String responseBody = httpclient.execute(httpget, responseHandler);
// qs = responseBody;
// } finally {
// httpclient.close();
// }
}
Map<String, String> map = getQueryMap(qs);
if (map.get("status").equals("fail")) {
String r = URLDecoder.decode(map.get("reason"), "UTF-8");
if (map.get("errorcode").equals("150")) {
throw new EmbeddingDisabled("error code 150");
}
if (map.get("errorcode").equals("100")) {
throw new VideoDeleted("error code 100");
}
throw new DownloadError(r);
// throw new PrivateVideoException(r);
}
info.setTitle(URLDecoder.decode(map.get("title"), "UTF-8"));
// String fmt_list = URLDecoder.decode(map.get("fmt_list"), "UTF-8");
// String[] fmts = fmt_list.split(",");
String url_encoded_fmt_stream_map = URLDecoder.decode(map.get("url_encoded_fmt_stream_map"), "UTF-8");
extractUrlEncodedVideos(url_encoded_fmt_stream_map);
// 'iurlmaxresæ or 'iurlsd' or 'thumbnail_url'
String icon = map.get("thumbnail_url");
icon = URLDecoder.decode(icon, "UTF-8");
info.setIcon(new URL(icon));
}
void extractIcon(VideoInfo info, String html) {
try {
Pattern title = Pattern.compile("itemprop=\"thumbnailUrl\" href=\"(.*)\"");
Matcher titleMatch = title.matcher(html);
if (titleMatch.find()) {
String sline = titleMatch.group(1);
sline = StringEscapeUtils.unescapeHtml4(sline);
info.setIcon(new URL(sline));
}
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
public static Map<String, String> getQueryMap(String qs) {
try {
qs = qs.trim();
List<NameValuePair> list;
list = URLEncodedUtils.parse(new URI(null, null, null, -1, null, qs, null), "UTF-8");
HashMap<String, String> map = new HashMap<String, String>();
for (NameValuePair p : list) {
map.put(p.getName(), p.getValue());
}
return map;
} catch (URISyntaxException e) {
throw new RuntimeException(qs, e);
}
}
void extractHtmlInfo(VideoInfo info, String html, AtomicBoolean stop, Runnable notify) throws Exception {
{
Pattern age = Pattern.compile("(verify_age)");
Matcher ageMatch = age.matcher(html);
if (ageMatch.find()) {
throw new AgeException();
}
}
{
Pattern age = Pattern.compile("(unavailable-player)");
Matcher ageMatch = age.matcher(html);
if (ageMatch.find()) {
throw new VideoUnavailablePlayer();
}
}
{
Pattern urlencod = Pattern.compile("\"url_encoded_fmt_stream_map\": \"([^\"]*)\"");
Matcher urlencodMatch = urlencod.matcher(html);
if (urlencodMatch.find()) {
String url_encoded_fmt_stream_map;
url_encoded_fmt_stream_map = urlencodMatch.group(1);
// normal embedded video, unable to grab age restricted videos
Pattern encod = Pattern.compile("url=(.*)");
Matcher encodMatch = encod.matcher(url_encoded_fmt_stream_map);
if (encodMatch.find()) {
String sline = encodMatch.group(1);
extractUrlEncodedVideos(sline);
}
// stream video
Pattern encodStream = Pattern.compile("stream=(.*)");
Matcher encodStreamMatch = encodStream.matcher(url_encoded_fmt_stream_map);
if (encodStreamMatch.find()) {
String sline = encodStreamMatch.group(1);
String[] urlStrings = sline.split("stream=");
for (String urlString : urlStrings) {
urlString = StringEscapeUtils.unescapeJava(urlString);
Pattern link = Pattern.compile("(sparams.*)&itag=(\\d+)&.*&conn=rtmpe(.*),");
Matcher linkMatch = link.matcher(urlString);
if (linkMatch.find()) {
String sparams = linkMatch.group(1);
String itag = linkMatch.group(2);
String url = linkMatch.group(3);
url = "http" + url + "?" + sparams;
url = URLDecoder.decode(url, "UTF-8");
addVideo(itag, url);
}
}
}
}
}
{
Pattern title = Pattern.compile("<meta name=\"title\" content=(.*)");
Matcher titleMatch = title.matcher(html);
if (titleMatch.find()) {
String sline = titleMatch.group(1);
String name = sline.replaceFirst("<meta name=\"title\" content=", "").trim();
name = StringUtils.strip(name, "\">");
name = StringEscapeUtils.unescapeHtml4(name);
info.setTitle(name);
}
}
}
void extractUrlEncodedVideos(String sline) throws Exception {
String[] urlStrings = sline.split("url=");
for (String urlString : urlStrings) {
urlString = StringEscapeUtils.unescapeJava(urlString);
// universal request
{
String url = null;
{
Pattern link = Pattern.compile("([^&]*)&");
Matcher linkMatch = link.matcher(urlString);
if (linkMatch.find()) {
url = linkMatch.group(1);
url = URLDecoder.decode(url, "UTF-8");
}
}
String itag = null;
{
Pattern link = Pattern.compile("itag=(\\d+)");
Matcher linkMatch = link.matcher(urlString);
if (linkMatch.find()) {
itag = linkMatch.group(1);
}
}
String sig = null;
{
Pattern link = Pattern.compile("signature=([^&,]*)");
Matcher linkMatch = link.matcher(urlString);
if (linkMatch.find()) {
sig = linkMatch.group(1);
} else {
link = Pattern.compile("signature%3D([^&,%]*)");
linkMatch = link.matcher(urlString);
if (linkMatch.find()) {
sig = linkMatch.group(1);
}
}
}
if (url != null && itag != null && sig != null) {
try {
new URL(url);
if (sig != null) {
url += "&signature=" + sig;
}
if (itag != null) {
addVideo(itag, url);
continue;
}
} catch (MalformedURLException e) {
// ignore bad urls
}
}
}
}
}
@Override
public void extract(VideoInfo info, AtomicBoolean stop, Runnable notify) {
try {
downloadone(info, stop, notify);
getVideo(info, sNextVideoURL);
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
throw new RuntimeException(e);
}
}
}
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我們可以用這個作商業用途？我的意思是這裏有任何許可證。 –
@Shabarinath我只能肯定地說我發佈的代碼可以隨意使用。就vget和它所依賴的庫而言，我不確定我可能會認爲他們可以自由地用於商業項目，但不能像商業銷售一樣銷售。我賣vget。但所有這些只是猜測，我建議你檢查他們的許可證，至少是vget和wget的許可證。 – melc
準備好的工作示例鏈接不工作 – Confuse