Hi,
Start from here:
bool
Frames::present( const QVideoFrame & frame )
{
if( !isActive() )
return false;
QVideoFrame f = frame;
f.map( QAbstractVideoBuffer::ReadOnly );
QImage image( f.bits(), f.width(), f.height(), f.bytesPerLine(),
QVideoFrame::imageFormatFromPixelFormat( f.pixelFormat() ) );
f.unmap();
emit newFrame( image.copy( image.rect() ) );
return true;
}
This works for me...
14-Jun-18 17:52, Jason H пишет:
I have no idea what I'm doing wrong. Can someone this and let me know?
The frames I'm getting are BGR32, so I have special code for that.
But I'm getting the message "QVideoFrame::unmap() was called more times then
QVideoFrame::map()"
Which is obviously not the case.
To restate the problems:
1. I only get to present() once
2. I's failing to map frames
3. "then" in the message should be "than"
Here's the first 3 lines of the .pro and complete code:
extractframes.pro-----
QT += multimedia
CONFIG += c++11 console
CONFIG -= app_bundle
main.cpp--------------
#include <QAbstractVideoSurface>
#include <QGuiApplication>
#include <QMediaPlayer>
#include <QVideoSurfaceFormat>
#include <QtDebug>
class VideoSurface: public QAbstractVideoSurface {
int _frameNumber;
QVideoSurfaceFormat _format;
QString _prefix;
int _frameInterval;
public:
VideoSurface(const QString &prefix, int frameInterval):
_prefix(prefix), _frameInterval(frameInterval) { }
bool present(const QVideoFrame &frame) override {
qDebug() << Q_FUNC_INFO << _frameNumber << frame.isValid();
if (_frameNumber % _frameInterval == 0) {
QVideoFrame frame2(frame);
frame2.map(QAbstractVideoBuffer::ReadOnly);
QImage image;
if (frame2.pixelFormat() == QVideoFrame::Format_BGR32) {
image = QImage(frame2.bits(), frame2.width(),
frame2.height(), QImage::Format_RGB32);
image = image.rgbSwapped();
} else {
image = QImage(frame2.bits(), frame2.width(),
frame2.height(), QVideoFrame::imageFormatFromPixelFormat(frame2.pixelFormat()));
}
frame2.unmap();
QString filename = QString(_prefix).arg(_frameNumber);
bool result = image.save(filename);
qDebug() << Q_FUNC_INFO << filename << result;
}
_frameNumber ++;
return true;
}
bool start(const QVideoSurfaceFormat &format) override {
qDebug() << Q_FUNC_INFO;
_format = format;
_frameNumber = 0;
QAbstractVideoSurface::start(format);
return true;
}
void stop() override {
qDebug() << Q_FUNC_INFO;
QAbstractVideoSurface::stop();
}
QList<QVideoFrame::PixelFormat>
supportedPixelFormats(QAbstractVideoBuffer::HandleType handleType) const override
{
Q_UNUSED(handleType);
return QList<QVideoFrame::PixelFormat>()
<< QVideoFrame::Format_ARGB32
<< QVideoFrame::Format_ARGB32_Premultiplied
<< QVideoFrame::Format_RGB32
<< QVideoFrame::Format_RGB24
<< QVideoFrame::Format_RGB565
<< QVideoFrame::Format_RGB555
<< QVideoFrame::Format_ARGB8565_Premultiplied
<< QVideoFrame::Format_BGRA32
<< QVideoFrame::Format_BGRA32_Premultiplied
<< QVideoFrame::Format_BGR32
<< QVideoFrame::Format_BGR24
<< QVideoFrame::Format_BGR565
<< QVideoFrame::Format_BGR555
<< QVideoFrame::Format_BGRA5658_Premultiplied
<< QVideoFrame::Format_AYUV444
<< QVideoFrame::Format_AYUV444_Premultiplied
<< QVideoFrame::Format_YUV444
<< QVideoFrame::Format_YUV420P
<< QVideoFrame::Format_YV12
<< QVideoFrame::Format_UYVY
<< QVideoFrame::Format_YUYV
<< QVideoFrame::Format_NV12
<< QVideoFrame::Format_NV21
<< QVideoFrame::Format_IMC1
<< QVideoFrame::Format_IMC2
<< QVideoFrame::Format_IMC3
<< QVideoFrame::Format_IMC4
<< QVideoFrame::Format_Y8
<< QVideoFrame::Format_Y16
<< QVideoFrame::Format_Jpeg
<< QVideoFrame::Format_CameraRaw
<< QVideoFrame::Format_AdobeDng;
}
};
// Command line: extractframes format interval
// format:QString, with %1 = frame number
// Example:
// extractframes filename.mp4 image_%1.png 30
int main(int argc, char *argv[])
{
QGuiApplication a(argc, argv);
QMediaPlayer player;
VideoSurface surface(argv[2], QString(argv[3]).toInt());
QObject::connect(&player, &QMediaPlayer::mediaStatusChanged, [=](
QMediaPlayer::MediaStatus status ) {
qDebug() << Q_FUNC_INFO << status;
});
QObject::connect(&player,
QOverload<QMediaPlayer::Error>::of(&QMediaPlayer::error), [=]( QMediaPlayer::Error
error ) {
qDebug() << Q_FUNC_INFO << error;
});
QObject::connect(&player, &QMediaPlayer::stateChanged, [=]( const
QMediaPlayer::State &state ) {
qDebug() << Q_FUNC_INFO << state;
if (QMediaPlayer::StoppedState == state) qApp->quit();
});
player.setMedia(QUrl::fromLocalFile(argv[1]));
player.setVideoOutput(&surface);
player.setMuted(true);
player.play();
return a.exec();
}
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