我如何使用QMediaPlayer播放流

我已经设置了一个服务器和视频流，这样我就可以使用以下命令行使用ffplay连接到流:

ffplay rtmp://<IP>/path

是否可以使用QMediaPlayer qmedicontent或其他东西连接到此流?

或者我可以用ffserver创建的任何其他类型的流。

使用与ffplay相同的路径会导致"Unsupported url scheme!"

通过进一步的实验，我尝试了ffserver http服务器流，但最终Qt崩溃在MFStreamer::doRead()

显然它应该为MFStreamer调用BeginRead，但它没有。

如何使用QMediaPlayer播放视频流?

编辑:这是我的代码

videotest.cpp

#include "videotest.h"
#include <QVBoxLayout>
#include <QVideoWidget>
#include <qmediaplayer.h>
#include <QMediaContent>
#include <QNetworkAccessManager>
#include <QNetworkReply>
struct VideoTest::Private
{
    QMediaPlayer * mediaPlayer;
    QNetworkAccessManager * networkAccessManager;
    QNetworkReply * reply;
};
VideoTest::VideoTest(QWidget *parent)
    : QMainWindow(parent)
{
    d = new Private;
    d->mediaPlayer = new QMediaPlayer(this, QMediaPlayer::StreamPlayback);
    d->networkAccessManager = new QNetworkAccessManager(this);
    ui.setupUi(this);
    QVideoWidget * videoWidget = new QVideoWidget(ui.centralWidget);
    videoWidget->show();
    QPalette palette = videoWidget->palette();
    palette.setColor(QPalette::Background, QColor(0, 0, 0));
    videoWidget->setPalette(palette);
    ui.videoLayout->addWidget(videoWidget);
    d->mediaPlayer->setVideoOutput(videoWidget);
    connect(ui.playButton, SIGNAL(clicked()), d->mediaPlayer, SLOT(play()));
    connect(ui.pauseButton, SIGNAL(clicked()), d->mediaPlayer, SLOT(pause()));
    connect(ui.videoUrlEdit, SIGNAL(editingFinished()), this, SLOT(sourceChanged()));
    connect(d->mediaPlayer, SIGNAL(error()), this, SLOT(stateChanged()));
    connect(d->mediaPlayer, SIGNAL(stateChanged), this, SLOT(stateChanged()));
}
VideoTest::~VideoTest()
{
    delete d;
}
void VideoTest::sourceChanged()
{
    d->reply = d->networkAccessManager->get(QNetworkRequest(ui.videoUrlEdit->text()));
    if(d->reply)
    {
        connect(d->reply, SIGNAL(readyRead()), this, SLOT(networkRequestReady()));
    }
}
void VideoTest::stateChanged()
{
    QString text = ui.textEdit->toPlainText();
    text.append("n").append(d->mediaPlayer->errorString()).append(" : ").append(d->mediaPlayer->mediaStatus());
    ui.textEdit->setText(text);
}
void VideoTest::networkRequestReady()
{
    d->mediaPlayer->setMedia(QMediaContent(), d->reply);
}

videotest.h

#ifndef VIDEOTEST_H
#define VIDEOTEST_H
#include <QtWidgets/QMainWindow>
#include "ui_videotest.h"
class VideoTest : public QMainWindow
{
    Q_OBJECT
public:
    VideoTest(QWidget *parent = 0);
    ~VideoTest();
public slots:
    void sourceChanged();
    void stateChanged();
    void networkRequestReady();
private:
    Ui::VideoTestClass ui;
    struct Private;
    Private * d;
};
#endif // VIDEOTEST_H

我找到了一个让它工作的方法。

我放弃了Qt, Qt的人坚持认为它应该工作，但无法产生任何有效的配置。他们说如果你从VLC流式传输，它应该可以工作，但我没有让它工作。我还尝试了ffmpeg, ffserver和nginx rtmp流。我把这些东西用mplayer, ffplay, VLC和一些甚至用Windows媒体播放器，但从来没有QMediaPlayer。

我试图把URL给setMedia。我试图制作一个自定义QIODevice来读取流数据，并将该数据提供给QMediaPlayer，该播放器已初始化为StreamPlayback，但它不会成功读取数据。

最后，我所需要的只是播放流的东西，是一个QWidget，并且没有GPL许可。

我使用libVLC和vlc-qt，它们都工作得很好。

遵循这些指示很容易，但您需要记住将头文件从vlc-qt/windows/vlc_headers/2.2/复制到vlc/sdk/include/vlc/plugins (sic)。这很重要，如果不这样做，编译过程中可能会出现错误。请注意，如果您的平台与我的版本不同，那么这些路径可能会有所不同。另外，当您阅读本文时，可能不需要。

VideoTest.h

#ifndef VIDEOTEST_H_
#define VIDEOTEST_H_
#include <QtWidgets/QMainWindow>
#include "ui_videotest.h"
class VideoTest: public QMainWindow
{
    Q_OBJECT
    public:
        VideoTest(QWidget * p_parent = 0);
        ~VideoTest();
    public slots:
        void sourceChanged();
    private:
        struct Private;
        Private * d;
        Ui::VideoTestClass ui;
};
#endif

videotest.cpp

#include "videotest.h"
#include <vlc-qt/Common.h>
#include <vlc-qt/Instance.h>
#include <vlc-qt/Media.h>
#include <vlc-qt/MediaPlayer.h>
#include <vlc-qt/WidgetVideo.h>
struct VideoTest::Private
{
    VlcInstance * vlcInstance;
    VlcMediaPlayer * vlcMediaPlayer;
    VlcMedia * vlcMedia;
    VlcWidgetVideo * vlcVideoWidget;
};
VideoTest::VideoTest(QWidget * p_parent)
{
    d = new Private();
    ui.setupUi(this);
    d->vlcMedia = 0;
    d->vlcInstance = new VlcInstance(VlcCommon::args(), this);
    d->vlcMediaPlayer = new VlcMediaPlayer(d->vlcInstance);
    d->vlcVideoWidget = new VlcWidgetVideo(this);
    d->vlcMediaPlayer->setVideoWidget(d->vlcVideoWidget);
    d->vlcVideoWidget->setMediaPlayer(d->vlcMediaPlayer);
    ui.videoLayout->addWidget(d->vlcVideoWidget);
    connect(ui.playButton, SIGNAL(clicked()), d->vlcMediaPlayer, SLOT(play()));
    connect(ui.pauseButton, SIGNAL(clicked()), d->vlcMediaPlayer, SLOT(pause()));
    connect(ui.videoUrlEdit, SIGNAL(editingFinished()), this, SLOT(sourceChanged()));
}
VideoTest::~VideoTest()
{
    delete d->vlcInstance;
    delete d->vlcMediaPlayer;
    delete d->vlcMedia;
    delete d;
}
VideoTest::sourceChanged()
{
    QUrl url(ui.videoUrlEdit->test());
    if(url.isValid() == false)
    {
        return;
    }
    d->vlcMediaPlayer->stop();
    delete d->vlcMedia;
    d->vlcMedia = new VlcMedia(url.toString(), d->vlcInstance);
    d->vlcMediaPlayer->open(d->vlcMedia);
}

VideoTest.ui

做你自己的，我不为你工作:D

只要确保它有pauseButton, playButton, videoUrlEdit(QLineEdit)和videoLayout，其中视频小部件将被插入

我刚刚设法在QML VideoOutput播放流与c++ QMediaPlayer使用setMedia(QUrl("http://127.0.0.1:8080"));
该流是由VLC媒体播放器使用HTTP到8080端口创建的。我还成功地播放了由VLC媒体播放器创建的流通过通过setMedia(QMediaContent(), &localFile);传递给QMediaPlayer到本地文件。

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