使用 AVFoundation 录制到电影文件时出错
这是一个奇怪的问题。我没有更改我的项目中涉及此的任何代码，但我的视频录制随机停止工作。当我尝试将电影保存到文件时，出现以下错误：
Error Domain=NSOSStatusErrorDomain Code=-12780“操作无法完成。（OSStatus 错误 -12780。）”
I使用以下代码开始捕获：
- (void)initVideoCapture {
self.captureSession = [[AVCaptureSession alloc] init];
AVCaptureDevice *videoCaptureDevice = [self frontFacingCameraIfAvailable];
AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:nil];
[self.captureSession addInput:videoInput];
aMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
[self.captureSession addOutput:aMovieFileOutput];
[self detectVideoOrientation:aMovieFileOutput];
[self.captureSession setSessionPreset:AVCaptureSessionPresetMedium];
[self.captureSession startRunning];
}
然后我从 viewController 调用此方法来开始录制：
- (void) startRecord {
NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
[outputFormatter setDateFormat:@"yyyyMMddHHmmss"];
NSString *newDateString = [outputFormatter stringFromDate:[NSDate date]];
[outputFormatter release];
NSString * fileString = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mov",newDateString]];
recordFileURL = [[NSURL alloc] initFileURLWithPath:fileString];
[aMovieFileOutput startRecordingToOutputFileURL:recordFileURL recordingDelegate:self];
}
此时我在该函数中收到错误。
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL fromConnections:(NSArray *)连接错误:(NSError *)错误
真正奇怪的是它有时会随机工作。就像，我将编译该项目，它会 100% 运行。下次编译时，它的运行率为 0%。我可能做错了什么？有什么明显的吗？
This is a strange problem. I have not changed any code involving this in my project but my video recording has randomly stopped working. When I try to save to a movie to a file I get the following error:
Error Domain=NSOSStatusErrorDomain Code=-12780 "The operation couldn’t be completed. (OSStatus error -12780.)"
I start my capture with the following code:
- (void)initVideoCapture {
self.captureSession = [[AVCaptureSession alloc] init];
AVCaptureDevice *videoCaptureDevice = [self frontFacingCameraIfAvailable];
AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:videoCaptureDevice error:nil];
[self.captureSession addInput:videoInput];
aMovieFileOutput = [[AVCaptureMovieFileOutput alloc] init];
[self.captureSession addOutput:aMovieFileOutput];
[self detectVideoOrientation:aMovieFileOutput];
[self.captureSession setSessionPreset:AVCaptureSessionPresetMedium];
[self.captureSession startRunning];
}
I then call this method from the viewController to start recording:
- (void) startRecord {
NSDateFormatter *outputFormatter = [[NSDateFormatter alloc] init];
[outputFormatter setDateFormat:@"yyyyMMddHHmmss"];
NSString *newDateString = [outputFormatter stringFromDate:[NSDate date]];
[outputFormatter release];
NSString * fileString = [NSTemporaryDirectory() stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.mov",newDateString]];
recordFileURL = [[NSURL alloc] initFileURLWithPath:fileString];
[aMovieFileOutput startRecordingToOutputFileURL:recordFileURL recordingDelegate:self];
}
At this time I get the error in this function.
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
fromConnections:(NSArray *)connections error:(NSError *)error
What is really weird is that it randomly works sometimes. Like, I will compile the project and it will work 100% of the time. Next time I compile it will work 0%. What could I be doing wrong? Anything obvious?
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当设备方向为 UIDeviceOrientationFaceUp、UIDeviceOrientationFaceDown 和 UIDeviceOrientationUnknown 时，我得到 -12780。由于录制视频的方向必须是纵向或横向，因此可能会出错。我必须编写一个快速方法来检查这三个，然后将它们转换为肖像。
I've gotten -12780 when the orientation of the device was UIDeviceOrientationFaceUp, UIDeviceOrientationFaceDown and UIDeviceOrientationUnknown. Since a recoded video's orientation has to be portrait or landscape, it'll error out on you. I had to write a quick method that checks for those three, and just translates them to portrait.
这似乎是苹果的一个错误。我通过使用 AVAssetWriter 和 AVAssetWriterInput 解决了这个问题
this seems to be a bug with apple. i solved it by using AVAssetWriter and AVAssetWriterInput