iphone - AVCaptureSession 暂停和恢复记录

Question

我正在使用 AVCaptureSession 为 iOS 5.0 制作电影应用程序。我让用户能够开始-暂停-开始-停止录制电影

我定义的三个按钮是

• 开始录制

• 停止录制

• 暂停录制

我能够成功开始和停止录制。我无法做的是暂停录音，然后再次恢复。我在堆栈溢出上查看了这个问题/答案，但我不知道他们是如何暂停和恢复视频的？我确实在这里找到了其他一些帖子，但它们都没有任何示例代码可供我试用。如果 AVAssetWrtier 是可行的方法，您如何将它与 AVCaptureSession 一起使用？

ios - Pause video recording

Pause & resume video capture for same file with AVFoundation in iOS

这是我的三个按钮的代码

        -(IBAction) makeMovieNow
        {
            NSLog(@"makeMovieNow ...");

[session startRunning];
            [movieFileOutput startRecordingToOutputFileURL:movieURL recordingDelegate:self];

        }

    -(IBAction) makeMovieStop
    {
        NSLog(@"makeMovieStop ...");

        //stop recording
        [session stopRunning];
    }

    -(IBAction) makeMoviePause
    {
        NSLog(@"makeMoviePause ...");

        //pause video??? How?

    }

//********** DID FINISH RECORDING TO OUTPUT FILE AT URL **********
- (void)captureOutput:(AVCaptureFileOutput *)captureOutput
didFinishRecordingToOutputFileAtURL:(NSURL *)outputFileURL
      fromConnections:(NSArray *)connections
                error:(NSError *)error
{

    NSLog(@"didFinishRecordingToOutputFileAtURL - enter");

    BOOL RecordedSuccessfully = YES;
    if ([error code] != noErr)
    {
        NSLog(@"ERROR RECODING MOVIE!!! - enter");

        // A problem occurred: Find out if the recording was successful.
        id value = [[error userInfo] objectForKey:AVErrorRecordingSuccessfullyFinishedKey];
        if (value)
        {
            RecordedSuccessfully = [value boolValue];
        }
    }
    if (RecordedSuccessfully)
    {
        //----- RECORDED SUCESSFULLY -----
        NSLog(@"didFinishRecordingToOutputFileAtURL - success");

        UISaveVideoAtPathToSavedPhotosAlbum(videoPath2, self, nil, nil);    

    }
}

Answer 1

http://www.gdcl.co.uk/2013/02/20/iPhone-Pause.html 处有一个示例 iPhone正是这样做的。它使用数据输出而不是电影文件输出，以便将数据传递到应用程序。然后，如果启用了录制，应用程序会将示例传递给 AVAssetWriter，并且在暂停/恢复后，时间戳会进行调整以消除暂停。

G