PHAsset视频压缩iOS swift

Question

我正在尝试将图像和视频上传到服务器。它工作得很好。我面临的问题是从iphone拍摄的照片或视频太大，上传到服务器需要时间。如何减小视频数据大小？

if(asset.mediaType == .video)
{           
    var dataMOV : Data?

    manager.requestAVAsset(forVideo: asset, options: option2, resultHandler:  {(asset: AVAsset?, audioMix: AVAudioMix?, info: [AnyHashable : Any]?) in
        let avURLAsset = asset as? AVURLAsset
        do
        {
            let data = try Data(contentsOf: (avURLAsset?.url)!)
            dataMOV = data
            print("asset data :%@ ", data)
        }
        catch
        {

        }
    })
}

Answer 1

从AssetInfo中提取资产URL并将其传递给下面的方法

func compressVideo(inputURL: URL, outputURL: URL, handler:@escaping (_ exportSession: AVAssetExportSession?)-> Void) {
        let urlAsset = AVURLAsset(url: inputURL, options: nil)
        guard let exportSession = AVAssetExportSession(asset: urlAsset, presetName: AVAssetExportPresetMediumQuality) else {
            handler(nil)

            return
        }

        exportSession.outputURL = outputURL
        exportSession.outputFileType = AVFileTypeQuickTimeMovie
        exportSession.shouldOptimizeForNetworkUse = true
        exportSession.exportAsynchronously { () -> Void in
            handler(exportSession)
        }
    }