Downloading a video from youtube

[Faster]

Hi, what qt4 class could I use to download a video from youtube? I need to download a video from an url like this: http://youtube.com/get_video?video_i...xA5rvs=&fmt=18. Firefox download this video but Qhttp fails to download. Any suggestions?
This is my code:

QString video_url = "http://youtube.com/get_video";
    QString argument = "?video_id=Th7-EzW0Ccw&t=vjVQa1PpcFNQDXk1DXroxSYaUxdfZ23C8lngRxA5rvs=&fmt=18";
    QString dest = "/home/faster/video.mp4";
 
    QUrl url(video_url);
    QFileInfo fileInfo(url.path());
    QString fileName = fileInfo.fileName();
    if (fileName.isEmpty())
        fileName = "index.html";
 
    file = new QFile(dest);
 
    QHttp::ConnectionMode mode = url.scheme().toLower() == "https" ? QHttp::ConnectionModeHttps : QHttp::ConnectionModeHttp;
    http->setHost(url.host(), mode, url.port() != -1 ? url.port() : 80);
 
    if (!url.userName().isEmpty())
        http->setUser(url.userName(), url.password());
 
    httpRequestAborted = false;
    QByteArray path = QUrl::toPercentEncoding(url.path(), "!$&'()*+,;=:@/");
    if (path.isEmpty())
        path = "/";
    httpGetId = http->get(video_url+argument, file);

QString video_url = "http://youtube.com/get_video";
    QString argument = "?video_id=Th7-EzW0Ccw&t=vjVQa1PpcFNQDXk1DXroxSYaUxdfZ23C8lngRxA5rvs=&fmt=18";
    QString dest = "/home/faster/video.mp4";
    
    QUrl url(video_url);
    QFileInfo fileInfo(url.path());
    QString fileName = fileInfo.fileName();
    if (fileName.isEmpty())
        fileName = "index.html";

    file = new QFile(dest);

    QHttp::ConnectionMode mode = url.scheme().toLower() == "https" ? QHttp::ConnectionModeHttps : QHttp::ConnectionModeHttp;
    http->setHost(url.host(), mode, url.port() != -1 ? url.port() : 80);

    if (!url.userName().isEmpty())
        http->setUser(url.userName(), url.password());

    httpRequestAborted = false;
    QByteArray path = QUrl::toPercentEncoding(url.path(), "!$&'()*+,;=:@/");
    if (path.isEmpty())
        path = "/";
    httpGetId = http->get(video_url+argument, file);

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[yogeshgokul]

Hi, what qt4 class could I use to download a video from youtube?

There are many options.
1. QHttp
2. QTCPSocket
3. QNetworkAccessManager
4. QDesktopServices::openUrl();

[Faster]

How can I download a video from http://youtube.com/get_video?video_i...xA5rvs=&fmt=18 using Qhttp? I posted my code but I don't understand what's wrong! It downloads a web page instead of the mp4 file.

[yogeshgokul]

How can I download a video from http://youtube.com/get_video?video_i...xA5rvs=&fmt=18 using Qhttp?

You need to call QHttp::get() with appropriate URL.

[Faster]

I used this:

http->get("http://youtube.com/get_video?video_id=Th7-EzW0Ccw&t=vjVQa1PpcFNQDXk1DXroxSYaUxdfZ23C8lngRxA5rvs=&fmt=18", file);

http->get("http://youtube.com/get_video?video_id=Th7-EzW0Ccw&t=vjVQa1PpcFNQDXk1DXroxSYaUxdfZ23C8lngRxA5rvs=&fmt=18", file);

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But it downloads only a web page and not the video file. If I open this link with firefox it downloads the correct video file. Any idea?

[squidge]

Its downloading what youtube is sending. You need to parse the downloaded web page most likely.

[Faster]

This is the web page content:

Moved Permanently
The document has moved here.
 
Apache Server at www.youtube.com Port 80

Moved Permanently
The document has moved here.

Apache Server at www.youtube.com Port 80

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I'm creating a program that allows the user to download a video from youtube. I written a code that generates a link to a mp4 file using http://youtube.com/get_video. The link generated is session-sensitive and changed every time the video is accessed. This url works with web browsers but doesn't work with my program.
Now I think that this url works only with web browsers. if my argumentation is right, how can I modify my code to make youtube believe that my program is a web browser, using qhttp?

Sorry for my poor English. I hope I explained myself.

[squidge]

Like I said before, you need to parse the returned content and process it. If a web browser receives "Moved Permanently The document has moved here.", then they will automatically follow that redirection. This is invisible to the user - they never see the message.

[Faster]

No, the web browser receives the correct video while qhttp receives a redirection web page! The redirection link contained in this web page is the same link that I have used to download the page!

[wysota]

When I follow the link you pasted using the browser, I get a blank page.

[squidge]

It doesn't work for me either. Maybe when Faster posts a link that works, we can help him