Qt调用FFmpeg命令录屏

//列出音视频设备
ffmpeg -list_devices true -f dshow -i dummy

//录屏命令

ffmpeg -f gdigrab -i desktop -f dshow -i audio="麦克风 (High Definition Audio 设备)" -pix_fmt yuv420p -vcodec libx264 -acodec aac -s 1440x900 -r 25 -q 10 -ar 44100 -ac 2 -tune zerolatency -preset ultrafast D:/tt.mp4

关闭ffmpeg进程：向QProcess发送q字符

ScreenRecord.h

#pragma once
#include <QWidget>class QProcess;
class QFile;class ScreenRecord : public QWidget
{Q_OBJECT
public:ScreenRecord(QWidget *parent = Q_NULLPTR);void Init();public slots:void Start();void Pause();void Stop();private:QProcess* m_recordProcess;QStringList m_args;QString m_audioDeviceName;QString m_outPath;int m_width;int m_height;int m_fps;QFile* m_tmpText;QString m_err;QStringList m_errList;
};

ScreenRecord.cpp

#include "ScreenRecord.h"
#include <QApplication>
#include <QDesktopWidget>
#include <QProcess>
#include <QTimer>
#include <QDebug>
#include <QTime>
#include <QDateTime>
#include <QFile>#include <Windows.h>ScreenRecord::ScreenRecord(QWidget *parent): QWidget(parent), m_recordProcess(new QProcess(this))
{connect(m_recordProcess, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),[this](int exitCode, QProcess::ExitStatus exitStatus) {qDebug() << QStringLiteral("成功录制临时视频");});Init();QTimer::singleShot(1000, this, SLOT(Start()));QTimer::singleShot(5000, this, SLOT(Pause()));QTimer::singleShot(6000, this, SLOT(Start()));QTimer::singleShot(10000, this, SLOT(Stop()));
}void ScreenRecord::Init()
{QProcess *listProcess = new QProcess(this);connect(listProcess, &QProcess::readyReadStandardError, [listProcess, this]() {//QString tmp = pro->readAllStandardError();m_err.append(listProcess->readAllStandardError());//qDebug() << tmp;});connect(listProcess, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),[this](int exitCode, QProcess::ExitStatus exitStatus) {m_errList = m_err.split("\r\n", QString::SkipEmptyParts);QStringList filter = m_errList.filter(QString::fromLocal8Bit("麦克风"));QString microphone = filter.first();QStringList filter2 = microphone.split("\"", QString::SkipEmptyParts);QStringList filter3 = filter2.filter(QString::fromLocal8Bit("麦克风"));//"麦克风 (High Definition Audio 设备)";m_audioDeviceName = "audio=" + filter3.first();m_outPath = QString("%1.mp4").arg(QDateTime::currentDateTime().toMSecsSinceEpoch());m_width = QApplication::desktop()->screenGeometry().width();m_height = QApplication::desktop()->screenGeometry().height();m_fps = 25;//QString audioName = "audio=" + QString::fromLocal8Bit("麦克风 (High Definition Audio 设备)");m_args << "-f" << "gdigrab";m_args << "-i" << "desktop";m_args << "-f" << "dshow";m_args << "-i" << m_audioDeviceName;m_args << "-pix_fmt" << "yuv420p";m_args << "-vcodec" << "libx264";m_args << "-acodec" << "aac";m_args << "-s" << QString::number(m_width) + "x" + QString::number(m_height);m_args << "-r" << QString::number(m_fps);m_args << "-q" << "10";m_args << "-ar" << "44100";m_args << "-ac" << "2";m_args << "-tune" << "zerolatency";m_args << "-preset" << "ultrafast";m_args << "-f" << "mp4";m_tmpText = new QFile(QString("D:\\t%1_tmp").arg(QDateTime::currentDateTime().toMSecsSinceEpoch()));if (!m_tmpText->open(QIODevice::ReadWrite | QIODevice::Text))qDebug() << "File open error";});QStringList listCmdArgs;listCmdArgs << "-list_devices" << "true" << "-f" << "dshow" << "-i" << "dummy";//listProcess->setWorkingDirectory("FFmpeg");listProcess->start("ffmpeg", listCmdArgs);
}void ScreenRecord::Start()
{//反斜线对应文本中是绝对路径，斜线对应相对路径QString tmpFilePath = QString("v%1_tmp").arg(QDateTime::currentDateTime().toMSecsSinceEpoch());QTextStream out(m_tmpText);out << "file" << " '" << tmpFilePath << "'\n";QStringList args = m_args;QString tmpFileAbsolutePath = "D:\\" + tmpFilePath;args << tmpFileAbsolutePath;//m_recordProcess->setWorkingDirectory("FFmpeg");m_recordProcess->start("ffmpeg", args);
}void ScreenRecord::Pause()
{//暂停录制->生成临时视频m_recordProcess->write("q");
}void ScreenRecord::Stop()
{//结束录制->合成视频connect(m_recordProcess, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),[this](int exitCode, QProcess::ExitStatus exitStatus) {QProcess* mergeProcess = new QProcess(this);connect(mergeProcess, static_cast<void(QProcess::*)(int, QProcess::ExitStatus)>(&QProcess::finished),[mergeProcess, this](int exitCode, QProcess::ExitStatus exitStatus) {qDebug() << QStringLiteral("成功合成视频");qDebug() << mergeProcess->readAllStandardError();});//ffmpeg -f concat -safe 0 -i filelist.txt -c copy output.mkvQStringList args;args << "-f" << "concat";args << "-safe" << "0";args << "-i" << m_tmpText->fileName();args << "-c" << "copy";args << m_outPath;//合成视频mergeProcess->start("ffmpeg", args);});m_tmpText->close();m_recordProcess->write("q");
}

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