Qt QCamera自动重置我的设置

我正在尝试在中设置一些设置

宣言 代码

---

我不明白它为什么不工作…

当您更改其设置时，您的mediaRecorder处于哪个状态？@vahancho它处于

QMediaRecorder:：StoppedState

QCamera *camera;
QMediaRecorder* mediaRecorder;
QVideoEncoderSettings videoSettings;

videoSettings.setFrameRate(10);
qDebug() << videoSettings.frameRate();
videoSettings.setQuality(QMultimedia::VeryLowQuality);
videoSettings.setResolution(200, 300);
qDebug() << videoSettings.resolution();
mediaRecorder->setVideoSettings(videoSettings);
qDebug() << mediaRecorder->videoSettings().resolution();

10
QSize(200, 300)
QSize(-1, -1) 0 // should be 200*300 an 10fps, isn't it ?