QT编写的视频播放器出问题
使用qt编写了一个视频播放器，在播放mp4视频的时候有音频但是不出现画面,求解答！~
#include <QtGui>#include "implayer.h"#include "ui_implayer.h"#include <QFile>#include<QTextStream>#include<QIcon>IMplayer::IMplayer(QWidget *parent) : QMainWindow(parent), ui(new Ui::IMplayer){ isMute = 0; isPlay = 1; isLength = 1; timePos = 0; timeLength = 0; ui->setupUi(this); ui->scheduleSlider->setRange(0,999); ui->voiceSlider->setRange(0, 99); mplayerProcess = new QProcess(this); mplayerProcess->setProcessChannelMode(QProcess::MergedChannels); //mplayerProgram = tr("D:/workstation/IMplayer/mplayer/mplayer.exe"); mplayerProgram = tr("/usr/bin/mplayer"); timeClock = new QTimer(this); connect(mplayerProcess, SIGNAL(readyReadStandardOutput()), this, SLOT(back_Message_slot())); connect(timeClock, SIGNAL(timeout()), this, SLOT(back_posMessage_slot()));}IMplayer::~IMplayer(){ delete ui;}void IMplayer::setUI(){}void IMplayer::play(QString fileName){ mplayerProcess->close(); ui->posTimeLineEdit->setText("00:00:00"); ui->lengthTimeLineEdit->setText("00:00:00"); ui->scheduleSlider->setValue(0); ui->voiceSlider->setValue(99); ui->playPushButton->setEnabled(1); ui->pausePushButton->setEnabled(1); ui->stopPushButton->setEnabled(1); ui->stepPushButton->setEnabled(1); ui->backPushButton->setEnabled(1); ui->scheduleSlider->setEnabled(1); ui->voiceSlider->setEnabled(1); ui->quietPushButton->setEnabled(1); QStringList args; args << tr("-slave"); args << "-quiet"; args << "-zoom"; args << tr("-wid") << QString::number((unsigned int)(ui->widget->winId())); args << "-vo" << "directx:noaccel"; args << fileName; timePos = 0; //ui->posTimeLineEdit->setText("00:00:00"); timeLength = 1; isLength = 1; mplayerProcess->start(mplayerProgram, args); mplayerProcess->write("get_time_length\n");}void IMplayer::on_playPushButton_clicked(){ if(isPlay == 0) { mplayerProcess->write("pause\n"); isPlay = 1; timeClock->start(); }}void IMplayer::on_pausePushButton_clicked(){ if(isPlay == 1) { mplayerProcess->write("pause\n"); //timeClock->isActive()= false; isPlay = 0; timeClock->stop(); }}void IMplayer::on_stopPushButton_clicked(){ timeClock->stop(); mplayerProcess->write("pausing_keep stop\n"); ui->posTimeLineEdit->setText("00:00:00"); ui->lengthTimeLineEdit->setText("00:00:00"); ui->scheduleSlider->setValue(0); ui->voiceSlider->setValue(99); ui->playPushButton->setDisabled(1); ui->pausePushButton->setDisabled(1); ui->stopPushButton->setDisabled(1); ui->stepPushButton->setDisabled(1); ui->backPushButton->setDisabled(1); ui->scheduleSlider->setDisabled(1); ui->voiceSlider->setDisabled(1); ui->quietPushButton->setIcon(QIcon(tr(":/images/images/voice.png"))); ui->quietPushButton->setDisabled(1);}void IMplayer::on_backPushButton_clicked(){ if(timePos >= 10) { timePos -= 10; } else { timePos = 0; } mplayerProcess->write("pausing_keep seek -10 0\n"); timeClock->stop(); back_posMessage_slot(); timeClock->start();}void IMplayer::on_stepPushButton_clicked(){ if(timePos <= (timeLength - 10)) { timePos += 10; } else { timePos = timeLength; } mplayerProcess->write("pausing_keep seek +10 0\n"); timeClock->stop(); back_posMessage_slot(); timeClock->start();}void IMplayer::on_quietPushButton_clicked(){ if(isMute == 1) { mplayerProcess->write("pausing_keep mute 0\n"); ui->quietPushButton->setIcon(QIcon(tr(":/images/images/voice.png"))); isMute = 0; } else { mplayerProcess->write("pausing_keep mute 1\n"); ui->quietPushButton->setIcon(QIcon(tr(":/images/images/quiet.png"))); isMute = 1; }}void IMplayer::on_action_OpenFile_triggered(){ currentFileName = QFileDialog::getOpenFileName(this, tr("璇烽?鎷╁獟浣撴枃浠?quot;), tr(""), tr("Video files(*.rmvb *.avi *.3gp *.mp4 *.mp3)")); if( !currentFileName.isEmpty() ) { this->play(currentFileName); }}QString IMplayer::timeConversion(int timeSec){ int timeSec1 = timeSec; QStringList ls; ls << QString::number((unsigned int) ((timeSec1 / 3600) % 60))<< ":"; ls << QString::number((unsigned int)((timeSec1 / 60)% 60)) << ":"; ls << QString::number((unsigned int)(timeSec1 %60)); QString src = ls.join(""); QTime time1 = QTime::fromString(src, "h:m:s"); QString time2 = time1.toString(); return time2;}void IMplayer::back_Message_slot(){ while(mplayerProcess->canReadLine()) { time = tr(mplayerProcess->readLine()); } QStringList timeLis; timeLis = time.split("="); qDebug() << time.trimmed(); qDebug() << time.simplified(); QStringList::iterator it = timeLis.end(); it--; QString leng = *it; int timeSecLength = (int)(leng.toFloat()); QString timeSec =timeConversion(timeSecLength); if(isLength == 1) { timeClock->start(1000); QString timeLengthStr = "/"; timeLength = timeSecLength; timeLengthStr += timeSec; ui->lengthTimeLineEdit->setText(timeLengthStr); timePos = 0; }else { timePos = timeSecLength; ui->posTimeLineEdit->setText(timeSec); }}void IMplayer::back_posMessage_slot(){ isLength = 0; mplayerProcess->write("get_time_pos\n"); //qDebug() << "abc"; //qDebug() << timeLength; //qDebug() << ui->scheduleSlider->maximum(); int posSlider = (ui->scheduleSlider->maximum() * timePos) / timeLength; //qDebug() << timePos; //qDebug() << "abc"; //qDebug() << posSlider ; ui->scheduleSlider->setValue(posSlider); //qDebug() << timePos;}void IMplayer::on_scheduleSlider_sliderMoved(int position){ posSlider = position; //qDebug() << "abc"; timePos = (timeLength * posSlider) / ui->scheduleSlider->maximum(); ui->posTimeLineEdit->setText(timeConversion(timePos));}void IMplayer::on_voiceSlider_sliderMoved(int position){ isMute = 0; int posVoice = position; int voicePos = (posVoice * 100) / ui->voiceSlider->maximum(); ui->quietPushButton->setIcon(QIcon(tr(":/images/images/voice.png"))); mplayerProcess->write(QString("volume " + QString::number(voicePos) + " 1\n" ).toUtf8()); //qDebug() << "123";}void IMplayer::on_scheduleSlider_sliderReleased(){ //qDebug() << timePos; mplayerProcess->write(QString("seek " + QString::number(timePos) + " 2\n").toUtf8()); back_posMessage_slot(); timeClock->start();}void IMplayer::on_scheduleSlider_sliderPressed(){ timeClock->stop();}void IMplayer::on_action_OpenFile_destroyed(QObject* ){}