使用 AVCaptureSession 录制视频

Posted 2023-03-12

【中文标题】使用 AVCaptureSession 录制视频

【英文标题】：Recording video with AVCaptureSession

【发布时间】：2013-10-19 08:34:38

【问题描述】：

我正在尝试使用 AVCaptureSession 和 AVCaptureMovieFileOutput 录制视频，但每当我尝试开始录制时，我都会在 didFinishRecordingToOutputFileAtURL AVCaptureFileOutputRecordingDelegate 方法中收到此错误。

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x15de7c40 AVErrorRecordingSuccessfullyFinishedKey=false, NSLocalizedDescription=The operation could not be completed, NSLocalizedFailureReason=An unknown error occurred (-12673), NSUnderlyingError=0x15d88aa0 "The operation couldn’t be completed. (OSStatus error -12673.)"

这是我用来添加 AVCaptureMovieFileOutput 并初始化我的 AVCaptureSession 的代码

- (AVCaptureSession *)session 
    if (!_session) 
        _session = [[AVCaptureSession alloc] init];


        // ADD CAMERA DEVICE
        NSError *error = nil;
        AVCaptureDeviceInput *videoInput = [AVCaptureDeviceInput deviceInputWithDevice:self.videoDevice error:&error];
        if (!videoInput) 
            NSLog(@"ERROR: trying to open camera: %@", error);
         else 
            [_session addInput:videoInput];
        


        // ADD AUDIO DEVICE
        error = nil;
        AVCaptureDeviceInput *audioInput = [AVCaptureDeviceInput deviceInputWithDevice:self.audioDevice error:&error];
        if (!audioInput)
        
            NSLog(@"ERROR: trying to open mic: %@", error);
         else 
            [_session addInput:audioInput];
        


        // ADD OUTPUT FILE
        if ([_session canAddOutput:self.movieFileOutput]) 
            [_session addOutput:self.movieFileOutput];
        


        [_session startRunning];
    

    return _session;

我的 AVCaptureMovieFileOutput 像这样延迟加载

- (AVCaptureMovieFileOutput *)movieFileOutput 
    if (!_movieFileOutput) 
        _movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

        Float64 TotalSeconds = 60;          //Total seconds
        int32_t preferredTimeScale = 30;    //Frames per second
        CMTime maxDuration = CMTimeMakeWithSeconds(TotalSeconds, preferredTimeScale);
        _movieFileOutput.maxRecordedDuration = maxDuration;
        _movieFileOutput.minFreeDiskSpaceLimit = 1024 * 1024;
    

    return _movieFileOutput;

我不确定我做错了什么，因为我见过的大多数教程都是这样的。

谢谢

【问题讨论】：

你检查过文件的目标路径是否可写吗？

【参考方案1】：

基本错误代码是-12673，这通常是由于尝试写入不可写的目录或文件引起的。尝试使用此代码编写：

NSString *documentsDirPath =[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) firstObject];
NSURL *documentsDirUrl = [NSURL fileURLWithPath:documentsDirPath isDirectory:YES];
NSURL *url = [NSURL URLWithString:@"out.mp4" relativeToURL:documentsDirUrl];
[self.movieFileOutput startRecordingToOutputFileURL:url recordingDelegate:self];

【讨论】：

这似乎是问题所在。感谢您的帮助！