Yes, I essentially have that (your message just made it to my email after I sent my code) I don't know why map() would fail, and why bits() would not be valid.
I'm on OSX, reading from an MP4... > Sent: Thursday, June 14, 2018 at 7:12 AM > From: "Igor Mironchik" <[email protected]> > To: [email protected] > Subject: Re: [Interest] (code) Cannot map videoforames for > QAbstractVideoSurface::present > > 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(); > > } > > _______________________________________________ > > Interest mailing list > > [email protected] > > http://lists.qt-project.org/mailman/listinfo/interest > > _______________________________________________ > Interest mailing list > [email protected] > http://lists.qt-project.org/mailman/listinfo/interest > _______________________________________________ Interest mailing list [email protected] http://lists.qt-project.org/mailman/listinfo/interest
