Question

I have a mac app that writes camera data to a file then uploads that file on an [NSTimer] to a server. However, after the camera runs for a while it closes itself and I see this in the log: * QTCaptureDeviceInput warning: The device "FaceTime HD Camera (Built-in)" was closed while still being used in a capture session. Make sure that the session is not running before closing any devices it is using.

没有任何其他可使用照相机进行测试,而该装置的物体则由我释放。我已经呼吁保留否决权,以防这种情况无用。

我看着 Apple果的docs,我发现,我没有谈到这个系统正在关闭的照相机,这样会造成这种情况。与此同时,我有一些守则定期检查,如果是开放的,如果是没有的话。

One thing I forgot I am using this notification and it is being fired: QTCaptureDeviceWasDisconnectedNotification

Answer 1

确实,这只是一次,但我发现这个问题。当你从一个运行的QaptureDevice公司中提取图像数据时,你需要通过下述代表方法与个人框架合作。如果你不能在每次操作时适当释放缓冲器,照相机最终将关闭。请注意以下法典:CORRECt;我附后是帮助任何阅读这一问题的人。希望节省了一个人花钱给我的时间......

- (void) captureOutput:(QTCaptureOutput *)captureOutput didOutputVideoFrame:(CVImageBufferRef)videoFrame withSampleBuffer:(QTSampleBuffer *)sampleBuffer fromConnection:(QTCaptureConnection *)connection {
    CVBufferRef bufferToBeReleased;
    CVBufferRetain(videoFrame);
    @synchronized (self) {
        imageBufferToRelease = imageIWanted;
        imageIWanted = videoFrame;
    }
    CVBufferRelease(bufferToBeReleased);
}

友情链接