#如果是linux平台下linux{message("linux平台下");INCLUDEPATH += /usr/local/includeLIBS += -L"/usr/local/lib"LIBS += -lavcodec -lavdevice -lavfilter -lavformat -lavutil -lswresample -lswscale
}android{message("android平台下")}

INCLUDEPATH += $$PWD/ffmpeg/include
LIBS += $$PWD/ffmpeg/lib/libavcodec.so \ $$PWD/ffmpeg/lib/libavdevice.so \ $$PWD/ffmpeg/lib/libavfilter.so \ $$PWD/ffmpeg/lib/libavformat.so \ $$PWD/ffmpeg/lib/libavutil.so \ $$PWD/ffmpeg/lib/libswresample.so ..

ffmpeg -ss 00:00:30 -t 600 -i src.mp4 -codec copy out.mp4
这条命令可以从源文件src.mp4中剪切出一个视频片段，并存储成out.mp4

-ss表示 起始时间戳

-t表示 持续时间，单位为秒

-i表示 源文件名字，这里是

-codec copy 表示沿用原来的编码格式，out.mp4为目标文件的文件名

QTableWidget表头设置无效的原因



clear () // 清空表格中所有内容（包含表头）
clearContents () // 清空表格中的内容（不包含表头）。
ui->tableWidget->clearContents(); ui->tableWidget->horizontalHeader()->setStretchLastSection(true); // 最后一列伸缩铺满 ui->tableWidget->setSelectionBehavior(QAbstractItemView::SelectRows); ui->tableWidget->verticalHeader()->setVisible(false); //设置垂直头不可见 ui->tableWidget->setColumnCount(5); //禁止编辑 ui->tableWidget-> ..

bool bSupp = QSslSocket::supportsSsl(); QString buildVersion = QSslSocket::sslLibraryBuildVersionString(); QString version = QSslSocket::sslLibraryVersionString(); qDebug() << bSupp << buildVersion << version << endl; QMessageBox msgBox; msgBox.setText("当前QT版本支持OpenSSL:"+buildVersion+version); msgBox.exec();//查看当前网络请求支持协议 //qDebug()<<manager->supportedSchemes(); QStringList zhi=manager->supportedSchemes();
QString str = zhi.join( ..

//函数setAlignment()主要将是消除布局中的空隙，让两个控件紧紧挨在一起
ui->textEdit->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
//隐藏横向滚动条
ui->textEdit->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
//隐藏竖向滚动条
ui->textEdit->setVerticalScrollBarPolicy( Qt::ScrollBarAlwaysOff );

/设置动态背景图片
QString image_url=song_urll_list.at(index).image_url;
//为了不占空间所以不用这句song_info_list.at(index).songname而用song_url.song_name的目的数据会覆盖该隐形文件
//如果在手机上路径要改"./sdcard/.jpg"
QString file_path=QString("./.jpg").arg(song_url.song_name);
get_pixmap=new Get_Pixmap;

get_pixmap->getPixmap_File(file_path,image_url);
QString css=QString("background-image:url(./.jpg)").arg(song_url.song_name);
ui->lycwidget->s ..

//实现颜色随机
int R=qrand()%255;
int G=qrand()%255;
int B=qrand()%255;
if(m_lyric_list.size() <= 0 || m_iCurrentIndex >= m_lyric_list.size())
return;


for(int i = 0; i < m_lyric_list.size(); i++)
{

if(position > m_lyric_list.at(i).time)
{
m_iCurrentIndex = i;
}
}


if(position > m_lyric_list.at(m_iCurrentIndex).time)
{
QString lrc;
lrc.clear();
lrc += QString("<p align='center'><span style=' font-style:italic;color:green'>" ..

QString Widget::sec2hms(int duration)
{
//用于时间转换 02:32
int min = duration/60;
int sesc = duration%60;
QString time = QString("%1:%2").arg(min).arg(sesc);
qDebug()<<"时间转化:"<<time;
return time;
}方法2:复制代码static QString second2String(int sec)
{
int hours = qFloor(sec / 3600);
int minutes = qFloor(sec % 3600 / 60);
int seconds = qFloor(sec % 3600 % 60);

QString hourStr = QString::number(hours, 10);
QString minStr = QString::number(minutes, ..

//数字大小写转换
QString Widget::numberToZh(int num)
{
QStringList zh = {"零","一","二","三","四","五","六","七","八","九","十"};
QString res = "";
if(num <= 10) {
res = zh;
} else if(num < 20) {
int bits = num % 10;
res = zh[10] + zh;
} else if(num < 100) {
int bits = num % 10;
int decade = num / 10;
if(bits == 0) {
res = zh + zh[10] + "整";
} else ..

//延时
void SLEEP::sleep(int sec)
{
    QTime dieTime = QTime::currentTime().addMSecs(sec);
    while( QTime::currentTime() < dieTime )
        QCoreApplication::processEvents(QEventLoop::AllEvents, 100);
}