来自 AVCaptureSession 的 AVCaptureVideoPreviewLayer 随机停止视频流

Question

我基于 AVCaptureSession 创建了一个简单的 AVCaptureVideoPreviewLayer，并将图层添加到 UIView。

AVCaptureSession *session = [[AVCaptureSession alloc] init];
session.sessionPreset = AVCaptureSessionPresetHigh;

AVCaptureDevice *device = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];

NSError *error = nil;
AVCaptureDeviceInput *input = [AVCaptureDeviceInput deviceInputWithDevice:device error:&error];

[session addInput:input];

AVCaptureVideoPreviewLayer *previewLayer = [[AVCaptureVideoPreviewLayer alloc] initWithSession:session];
previewLayer.frame = self.cameraView.bounds;

[self.cameraView.layer addSublayer:previewLayer];

[session startRunning];

运行应用程序后，代码似乎运行良好 - 但一段时间后（大约 60. - 90. 秒）视频随机冻结！

我添加了一个按钮来停止和启动 AVCaptureSession，如果我在冻结后按下该按钮，视频将再次开始工作......

有人知道随机停止视频流的原因吗？

Answer 1

尝试设置 AVCaptureMovieFileOutput 的 maxRecordedDuration 并添加，在您的 AVCaptureSession，这是 5000 秒记录持续时间的示例代码

AVCaptureMovieFileOutput *MovieFileOutput; =[[AVCaptureMovieFileOutput alloc] init];

Float64 MaxRecordDuration = 5000;           //Maximum RecordDuration in seconds replace 5000 with YOUR_MAX_DURATION
int32_t preferredTimeScale = 30;    //Frames per second
CMTime maxDuration = CMTimeMakeWithSeconds(MaxRecordDuration, preferredTimeScale);    //<<SET MAX DURATION

MovieFileOutput.maxRecordedDuration = maxDuration;
MovieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024;                        
if ([session canAddOutput:MovieFileOutput])
{
    [session addOutput:MovieFileOutput];
}
[session commitConfiguration];
[session startRunning];