我有一系列本地文件，我从 .m3u8 播放列表下载它们，因为我必须保存以供以后本地播放。 所有文件都是 .ts 格式，我想将它们全部合并到一个视频文件中。我已经尝试使用 AVMutableComposition 合并文件，我尝试将所有本地文件转换为 AVAsset 但属性 .tracks 始终返回 0，所以我认为 AVAsset 不正确，然后我尝试将所有文​​件重命名为 MPEG 但问题仍然相同。

有没有人知道如何正确读取这些文件，这是我到目前为止的代码:

 func mergeAllVideos(filesPath: URL) {
        let allVideos = extractAllFile(atPath: filesPath.absoluteString)
        var arrayVideos = [AVURLAsset]()
        var atTimeM: CMTime = CMTimeMake(0, 0)
        var lastAsset: AVAsset!
        var layerInstructionsArray = [AVVideoCompositionLayerInstruction]()
        var completeTrackDuration: CMTime = CMTimeMake(0, 1)
        var videoSize: CGSize = CGSize(width: 0.0, height: 0.0)
        var totalTime : CMTime = CMTimeMake(0, 0)

        for asset in allVideos.enumerated() {
            if let url = URL(string: asset.element) {

                let newAsset = AVURLAsset(url: url)
                arrayVideos.append(newAsset)
            }
        }

        let mixComposition = AVMutableComposition()
        for videoAsset in arrayVideos {
            let player = AVPlayer(url: videoAsset.url)

            let videoTrack = mixComposition.addMutableTrack(withMediaType: AVMediaTypeVideo, preferredTrackID: Int32(kCMPersistentTrackID_Invalid))
            do {
                if videoAsset == arrayVideos.first{
                    atTimeM = kCMTimeZero
                } else{
                    atTimeM = totalTime
                }
                print(videoAsset.tracks)
                try videoTrack.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAsset.tracks(withMediaType: AVMediaTypeVideo)[0], at: atTimeM)
                videoSize = videoTrack.naturalSize
            } catch let error as NSError {
                print("error: \(error)")
            }

            totalTime = CMTimeAdd(totalTime, videoAsset.duration)

            completeTrackDuration = CMTimeAdd(completeTrackDuration, videoAsset.duration)
            let videoInstruction = AVMutableVideoCompositionLayerInstruction(assetTrack: videoTrack)
            if let asset = arrayVideos.last, videoAsset != asset {
                videoInstruction.setOpacity(0.0, at: completeTrackDuration)
            }
            layerInstructionsArray.append(videoInstruction)
            lastAsset = videoAsset
        }

        let mainInstruction = AVMutableVideoCompositionInstruction()
        mainInstruction.timeRange = CMTimeRangeMake(kCMTimeZero, completeTrackDuration)
        mainInstruction.layerInstructions = layerInstructionsArray

        let mainComposition = AVMutableVideoComposition()
        mainComposition.instructions = [mainInstruction]
        mainComposition.frameDuration = CMTimeMake(1, 30)
        mainComposition.renderSize = CGSize(width: videoSize.width, height: videoSize.height)

        let documentDirectory = NSSearchPathForDirectoriesInDomains(.developerApplicationDirectory, .userDomainMask, true)[0]
        let dateFormatter = DateFormatter()
        dateFormatter.dateStyle = .long
        dateFormatter.timeStyle = .short
        let date = dateFormatter.string(from: NSDate() as Date)
        let savePath = (documentDirectory as NSString).appendingPathComponent("mergeVideo-\(date).mov")
        let url = NSURL(fileURLWithPath: savePath)

        let exporter = AVAssetExportSession(asset: mixComposition, presetName: AVAssetExportPresetHighestQuality)
        exporter!.outputURL = url as URL
        exporter!.outputFileType = AVFileTypeQuickTimeMovie
        exporter!.shouldOptimizeForNetworkUse = true
        exporter!.videoComposition = mainComposition
        exporter!.exportAsynchronously { 
            print("exported")
        }
    }

最佳答案

您不能使用 .ts 文件，将 .tv 扩展名重命名为 .mp4 也是不够的

您需要将.tv 文件翻译成mp4。您可以使用此库 https://github.com/Keemotion/TS2MP4为此

然后你就可以混合视频了

关于Swift 合并 .ts 或 mpeg 文件，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/44752232/