參考博主 1https://blog.csdn.net/liji_digital/article/details/83691035
參考博主2https://blog.csdn.net/qq_41071706/article/details/89855986

實(shí)現(xiàn)功能

1. 通過選擇按鈕選擇本地視頻文件
2. 點(diǎn)擊播放按鈕播放文本框中的文件（不支持其他類型文件的異常檢測(cè)） 支持mp4 avi等等 如果不支持見參考博主2的內(nèi)容
3. 點(diǎn)擊暫停按鈕，暫停本視頻播放，再次點(diǎn)擊播放按鈕，繼續(xù)本視頻的播放
4. 進(jìn)度條跟隨視頻進(jìn)度移動(dòng)
5. 拖動(dòng)進(jìn)度條改變視頻播放位置
6. 視頻必須播放之后才能拖動(dòng)進(jìn)度條改變播放進(jìn)度
7. 不支持快進(jìn)慢放等操作

1.首先創(chuàng)建一個(gè)帶ui的project

步驟省略

2.在ui文件中繪制如下模塊

實(shí)現(xiàn)代碼如下

// mainwindow.h

#ifndef MAINWINDOW_H
#define MAINWINDOW_H

#include <QMainWindow>
#include <QWidget>
#include <QtMultimediaWidgets/QVideoWidget>
#include <QtMultimedia/QtMultimedia>

namespace Ui {
class MainWindow;
}

class MainWindow : public QMainWindow
{
    Q_OBJECT

public:
    explicit MainWindow(QWidget *parent = 0);
    ~MainWindow();

private:
    Ui::MainWindow *ui;
    QVideoWidget    *       m_pPlayerWidget;
    QMediaPlayer    *       m_pPlayer;

public slots:
    void onSetMediaFile();
    void onStartPlayMedia();
    void onChangedPlayerPosition(qint64 pos);
};

#endif // MAINWINDOW_H

// mainwindow.cpp

#include "mainwindow.h"
#include "ui_mainwindow.h"
#include <QtMultimediaWidgets/QVideoWidget>
#include <QtMultimedia/QtMultimedia>
#include <QFileDialog>
#include <QMessageBox>
#include <QException>
#include <QDebug>
#include "player-slider.h"

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    m_pPlayer = new QMediaPlayer;
    m_pPlayerWidget = new QVideoWidget;

    QPalette qplte;
    qplte.setColor(QPalette::Window, QColor(0,0,0));
    m_pPlayerWidget->setPalette(qplte);

    m_pPlayer->setVideoOutput(m_pPlayerWidget);
    ui->verticalLayout->addWidget(m_pPlayerWidget);

    m_pPlayerWidget->setAutoFillBackground(true);
    QObject::connect(ui->pushButton_3,&QPushButton::clicked,this,&MainWindow::onSetMediaFile);
    QObject::connect(ui->pushButton,&QPushButton::clicked,this,&MainWindow::onStartPlayMedia);
    QObject::connect(ui->pushButton_2,&QPushButton::clicked,this->m_pPlayer,&QMediaPlayer::pause);

    QObject::connect(m_pPlayer, &QMediaPlayer::positionChanged, ui->horizontalSlider,&QPlayerSlider::setValue);

    QObject::connect(m_pPlayer, &QMediaPlayer::durationChanged, ui->horizontalSlider,&QPlayerSlider::setDurationPosition);
    QObject::connect(ui->horizontalSlider,&QPlayerSlider::sigProgress,this,&MainWindow::onChangedPlayerPosition);

}

MainWindow::~MainWindow()
{
    delete ui;
}

void MainWindow::onSetMediaFile()
{
    QFileDialog dialog(this);
    dialog.setFileMode(QFileDialog::AnyFile);
    QStringList fileNames;
    if(dialog.exec())
    {
        fileNames = dialog.selectedFiles();
    }
    if(!fileNames.empty())
    {
        ui->lineEdit->setText(fileNames[0]);
    }
}

void MainWindow::onStartPlayMedia()
{
    qDebug()<<ui->lineEdit->text()<<"\n"<<m_pPlayer->currentMedia().canonicalUrl().path();
    QString filePath = ui->lineEdit->text();
    if(filePath != nullptr && filePath != ""){
        if(m_pPlayer->state() == QMediaPlayer::PausedState &&
           ui->lineEdit->text() == m_pPlayer->currentMedia().canonicalUrl().path().right(m_pPlayer->currentMedia().canonicalUrl().path().length()-1))
        {
            m_pPlayer->play();
        }
        else {
            m_pPlayer->setMedia(QUrl::fromLocalFile(filePath));
            m_pPlayer->play();
        }
    }
    else{
        QMessageBox::critical(this,"警告","請(qǐng)選擇要播放的視頻文件！");
    }
}

void MainWindow::onChangedPlayerPosition(qint64 pos)
{
    QObject::disconnect(m_pPlayer, &QMediaPlayer::positionChanged, ui->horizontalSlider,&QPlayerSlider::setValue);
    m_pPlayer->setPosition(pos);
    QObject::connect(m_pPlayer, &QMediaPlayer::positionChanged, ui->horizontalSlider,&QPlayerSlider::setValue);

}

// playerslider.h 需要將ui的slider提升為QPlayerSlider類

#ifndef PLAYERSLIDER_H
#define PLAYERSLIDER_H
#include <QSlider>

class QPlayerSlider :public QSlider{
    Q_OBJECT
public:
    QPlayerSlider(QWidget* parent = 0);
public slots:
    void setDurationPosition(qint64 max_len);
signals:
    void sigProgress(qint64 pos);
protected:
    void mouseReleaseEvent(QMouseEvent *e);
    void mousePressEvent(QMouseEvent *e);
    void mouseMoveEvent(QMouseEvent *e);
};


#endif // PLAYERSLIDER_H

// playerslider.cpp

#include "player-slider.h"
#include <QDebug>

QPlayerSlider::QPlayerSlider(QWidget * parent) : QSlider(parent)
{

}

void QPlayerSlider::setDurationPosition(qint64 max_len)
{
    setRange(0,max_len);
}

void QPlayerSlider::mouseReleaseEvent(QMouseEvent *e)
{
    qint64 pos = this->value();
    emit sigProgress(pos);
    QSlider::mouseReleaseEvent(e);
}


void QPlayerSlider::mousePressEvent(QMouseEvent *e)
{
    QSlider::mousePressEvent(e);
}

void QPlayerSlider::mouseMoveEvent(QMouseEvent *e)
{
    QSlider::mouseMoveEvent(e);
}

實(shí)現(xiàn)效果

全部代碼見 https://download.csdn.net/download/hyperspace88466/72190342
僅供練習(xí)，如有問題請(qǐng)留言~文章來源地址http://www.zghlxwxcb.cn/news/detail-421427.html

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