在生产模式下 - 导出视频时出现“操作已停止”错误

Question

当应用程序进入生产模式时，请帮我解决这个问题我每次制作视频时都会出现“操作停止”错误

• 它在开发模式下工作完美，但在生产中它给出了这个错误

• 实际上，过程是将多个视频合并为一个，并且有 4 个录制的视频以及前端和后端保险杠视频，并为该视频添加音轨。

• 合并过程就像所有视频轨道的 AVMutableVideoCompositionLayerInstruction 与 [front bumper, video1, video2, video3, end bumper] 之类的数组组合在一个 AVMutableVideoCompositionInstruction 中。

• 我也设置了“mainInstruction.timeRange”意味着主视频持续时间和音频持续时间都相同然后仍然发生此错误

• 当我在合并后导出最终视频时会发生此错误。

=> 将音频添加到轨道的代码

let audioMix = AVMutableAudioMix()
            
let musicAudioTrack: AVMutableCompositionTrack = mixComposition.addMutableTrack(withMediaType: AVMediaType.audio, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))!
            
            do {
                
                try musicAudioTrack.insertTimeRange(CMTimeRangeMake(start: CMTime.zero, duration: runningTime!), of: musicAsset.tracks(withMediaType: AVMediaType.audio)[0], at: CMTime.zero)
                musicAudioTrack.preferredVolume = self.volumeSlider.value               
                let audioMixInputParams = AVMutableAudioMixInputParameters()
                audioMixInputParams.trackID = musicAudioTrack.trackID
                audioMixInputParams.setVolume(self.volumeSlider.value, at: CMTime.zero)
                audioMix.inputParameters.append(audioMixInputParams)
               
            } catch {
                
            }

=> MainInstruction的代码

• runningTime 是最终视频的持续时间

let mainInstruction = AVMutableVideoCompositionInstruction()
mainInstruction.timeRange = CMTimeRangeMake(start: CMTime.zero, duration: runningTime!) 
mainInstruction.layerInstructions = [videoLayerInstructionFront!,videoLayerIntruction1!,videoLayerIntruction2,videoLayerIntruction3,videoLayerIntruction4,videoLayerInstructionEnd!]

let renderWidth = videoTrack.naturalSize.width
let renderHeight = videoTrack.naturalSize.height

let mainCompositionInst = AVMutableVideoComposition()
mainCompositionInst.frameDuration = CMTimeMake(value: 1, timescale: 60)
mainCompositionInst.renderScale = 1.0
mainCompositionInst.renderSize = CGSize(width: renderWidth, height: renderHeight)
mainCompositionInst.instructions = [mainInstruction]

let exporter: AVAssetExportSession = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)!
exporter.outputURL = self.template.finalURL
exporter.outputFileType = AVFileType.mov
exporter.audioMix = audioMix
exporter.shouldOptimizeForNetworkUse = true
exporter.videoComposition = mainCompositionInst
exporter.exportAsynchronously(completionHandler: {
                DispatchQueue.main.async{
                    self.exportDidFinish(session: exporter)
                }
            })

• 最后在这里，当我导出我的最终视频时，出现“操作停止”错误。

Answer 1

您必须检查音频时间。