慢动作视频, 特殊处理
1, exportSession
let option = PHVideoRequestOptions()
option.isNetworkAccessAllowed = true
option.deliveryMode = .highQualityFormat
PHCachingImageManager.default().requestExportSession(forVideo: asset, options: option, exportPreset: AVAssetExportPresetHighestQuality) { (exportSession, info) in
guard let exportSession = exportSession else {
single(.error(KimPhotoHelperError.sourceNotFound))
return
}
exportSession.outputURL = videoPath
exportSession.outputFileType = .mp4
exportSession.exportAsynchronously {
switch exportSession.status {
case .completed:
single(.success((videoPath.relativePath, size)))
case .failed:
print(exportSession.error)
single(.error(KimPhotoHelperError.sourceNotFound))
default:
break
}
}
}//代码效果参考：http://www.ezhiqi.com/zx/art_6832.html
2, PHAssetResourceManager
let resourceManager = PHAssetResourceManager.default()
let option = PHAssetResourceRequestOptions()
option.isNetworkAccessAllowed = true
resourceManager.writeData(for: assetRescource, toFile: videoPath, options: option) { (error) in
guard let error = error else {
//single(.error(e))
exportSession(asset)
return
}
single(.success((videoPath.relativePath, size)))
}
3, 先 requestDatqa -> 再 writeData
let resourceManager = PHAssetResourceManager.default()
let option = PHAssetResourceRequestOptions()
option.isNetworkAccessAllowed = true
var videoData = Data()
resourceManager.requestData(for: assetRescource, options: option, dataReceivedHandler: { (data) in
videoData.append(data)
}) { (error) in
if let error = error {
print(error)
exportSession(asset)
// single(.error(KimPhotoHelperError.sourceNotFound))
} else {
do {
try videoData.write(to: videoPath)
} catch {
}
single(.success((videoPath.relativePath, size)))
}
}
4, 导出慢动作视频 AVCompostion 类型
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")
}
})
}) }
