Ios 如何将AVMutableVideoComposition转换为AVAsset

我正在做一些视频编辑，我需要把我正在处理的AVMutableVideoComposition放回一个播放器项目中。要进入玩家物品，它需要是一个AVAsset。如何做到这一点？

您可以使用

AVMutableComposition

作为

AVPlayerItem

的资产，因为

AVMutableComposition

是

AVAsset

的子类

AVMutableVideoComposition

不是

AVAsset

的子类，而是在

AVMutableComposition

中显示插入到

AVAssetTracks

中的视频的一种方式

（如果您的所有视频都按照您希望的方式放置，而没有

AVMutableVideoComposition

，则您可能不需要设置播放器项目的

videoComposition

属性）

ObjC：

斯威夫特：

let composition = AVMutableComposition(...
let videoComposition = AVMutableVideoComposition(...
let item = AVPlayerItem(asset: composition)
item.videoComposition = videoComposition

---

选中此选项-exportPath可以是保存视频的任何临时路径

    func ConvertAvcompositionToAvasset(avComp: AVComposition, completion:@escaping (_ avasset: AVAsset) -> Void){
        let exporter = AVAssetExportSession(asset: avComp, presetName: AVAssetExportPresetHighestQuality)
        let randNum:Int = Int(arc4random())
        //Generating Export Path
        let exportPath: NSString = NSTemporaryDirectory().appendingFormat("\(randNum)"+"video.mov") as NSString
        let exportUrl: NSURL = NSURL.fileURL(withPath: exportPath as String) as NSURL
        //SettingUp Export Path as URL
        exporter?.outputURL = exportUrl as URL
        exporter?.outputFileType = AVFileTypeQuickTimeMovie
        exporter?.shouldOptimizeForNetworkUse = true
        exporter?.exportAsynchronously(completionHandler: {() -> Void in
            DispatchQueue.main.async(execute: {() -> Void in
                if exporter?.status == .completed {
                    let URL: URL? = exporter?.outputURL
                    let Avasset:AVAsset = AVAsset(url: URL!)
                    completion(Avasset)
                }
                else if exporter?.status == .failed{
                    print("Failed")

                }
            })
        }) }

看看这个答案：

    func ConvertAvcompositionToAvasset(avComp: AVComposition, completion:@escaping (_ avasset: AVAsset) -> Void){
        let exporter = AVAssetExportSession(asset: avComp, presetName: AVAssetExportPresetHighestQuality)
        let randNum:Int = Int(arc4random())
        //Generating Export Path
        let exportPath: NSString = NSTemporaryDirectory().appendingFormat("\(randNum)"+"video.mov") as NSString
        let exportUrl: NSURL = NSURL.fileURL(withPath: exportPath as String) as NSURL
        //SettingUp Export Path as URL
        exporter?.outputURL = exportUrl as URL
        exporter?.outputFileType = AVFileTypeQuickTimeMovie
        exporter?.shouldOptimizeForNetworkUse = true
        exporter?.exportAsynchronously(completionHandler: {() -> Void in
            DispatchQueue.main.async(execute: {() -> Void in
                if exporter?.status == .completed {
                    let URL: URL? = exporter?.outputURL
                    let Avasset:AVAsset = AVAsset(url: URL!)
                    completion(Avasset)
                }
                else if exporter?.status == .failed{
                    print("Failed")

                }
            })
        }) }