问题描述

我正在借助 WWDC 2010 AVCamDemo 示例.在应用程序中，我需要从 iPhone 的前置摄像头录制视频，但由于我所在的地方没有新的 iPhone 4，我无法正确测试代码.

I'm developing an application with the help of sample code from the WWDC 2010 AVCamDemo example. In the app I need to record a video from the front camera of iPhone, but since the new iPhone 4 is not available at my place I am not able to test the code properly.

如果有人能提醒我我的方向是否正确，我将非常感激.当我设置 AVCaptureSession 时，我可以在 iPhone 3G(升级到 iOS 4.1)上测试的有限代码崩溃，如下面的代码所示:

I would be really thankful if someone can give me a heads up whether I'm going in the right direction or not. The limited code I could test on my iPhone 3G (upgraded to iOS 4.1) crashes when I set the AVCaptureSession, as shown in the code below:

- (void)recordVideo
{
    NSLog(@"video recording on");

    AVCaptureDevice *videoCaptureDevice = [AVCaptureDevice defaultDeviceWithMediaType:AVMediaTypeVideo];
    AVCaptureDeviceInput *videoInput = [[AVCaptureDeviceInput alloc] initWithDevice:videoCaptureDevice error:nil];  
    AVCaptureMovieFileOutput *movieFileOutput = [[AVCaptureMovieFileOutput alloc] init];

    [movieFileOutput release];

    AVCaptureSession *session = [[AVCaptureSession alloc] init];
    [session addInput:videoInput];
    [session addOutput:movieFileOutput];
    [self setSession:session]; // crashes

    if (![session isRunning])
    {
        [self performSelector:@selector(startRecording) withObject:nil afterDelay:1.0];
        [session startRunning];
    }
}


- (void)startRecording
{

    AVCaptureConnection *videoConnection = [playVideo connectionWithMediaType:AVMediaTypeVideo fromConnections:[[self movieFileOutput] connections]];

    if ([videoConnection isVideoOrientationSupported]) {
        [videoConnection setVideoOrientation:[self orientation]]; 
    }

    [[self movieFileOutput] startRecordingToOutputFileURL:[self tempFileURL]
                                        recordingDelegate:self];
}


- (void) stopRecording
{
    NSLog(@"stop recording");
    [[self movieFileOutput] stopRecording];
}

- (NSURL *) tempFileURL
{

    NSString *outputPath = [[NSString alloc] initWithFormat:@"%@%@", NSTemporaryDirectory(), @"output.mov"];
    NSURL *outputURL = [[NSURL alloc] initFileURLWithPath:outputPath];
    NSFileManager *fileManager = [NSFileManager defaultManager];
    if ([fileManager fileExistsAtPath:outputPath]) {
        NSLog(@"file saved");
    }
    [outputPath release];
    return [outputURL autorelease];
}

+ (AVCaptureConnection *)connectionWithMediaType:(NSString *)mediaType fromConnections:(NSArray *)connections;
{
    for ( AVCaptureConnection *connection in connections ) {
        for ( AVCaptureInputPort *port in [connection inputPorts] ) {
            if ( [[port mediaType] isEqual:mediaType] ) {
                return [[connection retain] autorelease];
            }
        }
    }
    return nil;
}

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didStartRecordingToOutputFileAtURL:(NSURL *)fileURL
                   fromConnections:(NSArray *)connections
{

}

- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
                    fromConnections:(NSArray *)connections
                              error:(NSError *)error
{
    ALAssetsLibrary *library = [[ALAssetsLibrary alloc] init];

    if ([library videoAtPathIsCompatibleWithSavedPhotosAlbum:outputFileURL])
    {
        [library writeVideoAtPathToSavedPhotosAlbum:outputFileURL
                                    completionBlock:^(NSURL *assetURL, NSError *error)];
    }

    [library release];       
}

推荐答案

movieFileOutput 分配后立即释放.(第 9 行)

movieFileOutput is released immediately after it has been allocated. (line 9)

这篇关于使用 AVFoundation 框架 iPhone 录制视频?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持跟版网！