在Swift 4中合并两个视频？

所以我有两个.mp4已经录制并存储在应用程序中，我想将一个附加到另一个，并导出为新视频。这有点效果，但不是很好

    let composition = AVMutableComposition()
    var track = composition.addMutableTrack(withMediaType: AVMediaType.video, preferredTrackID:Int32(kCMPersistentTrackID_Invalid))

    let videoAsset = AVAsset(url: AAA as URL) as AVAsset
    let videoAsset2 = AVAsset(url: BBB as URL) as AVAsset
    do {
        try track?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAsset.tracks(withMediaType: AVMediaType.video)[0] as AVAssetTrack, at: kCMTimeZero)
        try track?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAsset2.tracks(withMediaType: AVMediaType.video)[0] as AVAssetTrack, at: kCMTimeZero)

    } catch {
        print("darn")
    }

    let exporter = AVAssetExportSession(asset: composition, presetName: AVAssetExportPresetHighestQuality)
    exporter?.outputURL = CCC
    exporter?.outputFileType = AVFileType.mp4
    exporter?.shouldOptimizeForNetworkUse = true


    exporter?.exportAsynchronously {
        print("done?")
    }

---

这种方式结合了视频，但在两个剪辑之间添加了大量的黑屏，并删除了音频。我找不到这个问题的最新答案。谢谢你的帮助

视频时间线看起来有误，例如，您在同一时间点零插入两个视频，并且对

videoAsset2

使用了错误的持续时间

缺少音频是因为您没有在合成中插入任何音频曲目

尝试类似以下（重复）片段的内容：

// video
try track?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAsset.tracks(withMediaType:.video)[0] as AVAssetTrack, at: kCMTimeZero)
try track?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset2.duration), of: videoAsset2.tracks(withMediaType:.video)[0] as AVAssetTrack, at: videoAsset.duration)

// audio
try track?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset.duration), of: videoAsset.tracks(withMediaType:.audio)[0] as AVAssetTrack, at: kCMTimeZero)
try track?.insertTimeRange(CMTimeRangeMake(kCMTimeZero, videoAsset2.duration), of: videoAsset2.tracks(withMediaType:.audio)[0] as AVAssetTrack, at: videoAsset.duration)

---

免责声明：我不确定使用

AVAssetTrack

拥有的

AVAsset

持续时间作为音轨长度的代理是否是一种好的做法。也许你应该使用

AVAssetTrack.timeRange

请从UI添加屏幕截图将视频放入阵列中，然后尝试此阵列合并