Question

在我的应用程序中，我使用The Amazing Audio Engine库播放支持音轨时录制视频。

在支持音轨的末尾，我停止录制视频。除了在支持轨道结束之前有时调用captureOutput方法，在它的中间。

当它追加时，我的应用程序在captureOutput的调用之后传递给我的后备跟踪播放器的完成块，并且在我的代码中调用了captureMovieFileOutput.stopRecording() NOWHERE。

以下是支持轨道的完成块：

audioFilePlayer.completionBlock = {
                                    self.view.userInteractionEnabled = false
                                    captureMovieFileOutput.stopRecording()
                                    audioRecorder.finishRecording()
                                    appDelegate.audioController.removeChannels(appDelegate.audioController.channels())
                                    appDelegate.audioController.removeInputReceiver(audioRecorder)
                                    self._activityIndicator.hidden = false
                                    self._cancelButton.hidden = true
                                    self._captureSession.removeOutput(captureMovieFileOutput)
                                    self._progressView.hidden = true
                                    self._readyGoLabel.hidden = true
                                    self._recordAnimationView.hidden = true
                                    self._recordAnimationView.stopAnimation()
                                    self._restartButton.hidden = true
                                }

这是captureOutput函数：

func captureOutput(captureOutput: AVCaptureFileOutput!, didFinishRecordingToOutputFileAtURL outputFileURL: NSURL!, fromConnections connections: [AnyObject]!, error: NSError!) {
    if !self.view.userInteractionEnabled {
        if let audioRecordOutputURL = self._audioRecordOutputURL {
            if let videoRecordOutputURL = self._videoRecordOutputURL {
                let audioAsset = AVURLAsset(URL: audioRecordOutputURL, options: [AVURLAssetPreferPreciseDurationAndTimingKey: true])
                let mutableComposition = AVMutableComposition()
                let videoAsset = AVURLAsset(URL: videoRecordOutputURL, options: [AVURLAssetPreferPreciseDurationAndTimingKey: true])

                self._readyGoLabel.hidden = false

                for anyObject in videoAsset.tracksWithMediaType(AVMediaTypeVideo) {
                    if let track = anyObject as? AVAssetTrack {
                        var error: NSError?
                        let mutableCompositionTrack: AVMutableCompositionTrack

                        if track.mediaType == AVMediaTypeVideo {
                            mutableCompositionTrack = mutableComposition.addMutableTrackWithMediaType(AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
                            mutableCompositionTrack.insertTimeRange(CMTimeRange(start: kCMTimeZero, duration: track.timeRange.duration), ofTrack: track, atTime: kCMTimeZero, error: &error)
                            mutableCompositionTrack.preferredTransform = track.preferredTransform
                        }
                        if let error = error {
                            ErrorManager.defaultManager().showFatalError(title: "Error: AVFoundation", message: error.localizedFailureReason)
                        }
                    } else {
                        preconditionFailure("Fatal error: unreachable code.")
                    }
                }
                if let cizooPreviewViewController = self.storyboard?.instantiateViewControllerWithIdentifier(Constants.CizooPreviewViewControllerIdentifier) as? CizooPreviewViewController {
                    cizooPreviewViewController._cizoo = mutableComposition
                    cizooPreviewViewController._voiceUrl = self._audioRecordOutputURL
                    cizooPreviewViewController._recordedBackingTrack = self._backingTrack

                    self.presentViewController(cizooPreviewViewController, animated: true, completion: nil)
                } else {
                    preconditionFailure("Fatal error: unreachable code.")
                }
            }
        }
    }
}

问题追加时，在captureOutput方法中，我的应用未通过条件if !self.view.userInteractionEnabled，错误为零。

我已经在iPhone 4s和iPhone 5c上看到了这个问题，而且从未在iPhone 5s和6s上看到过这个问题。

过早调用captureOutput

0 个答案: