无法在 iOS 4 中转换为 mp13

Question

在运行 iOS 13 的设备上，[导出会话导出异步与完成处理程序：转换时总是失败并显示消息"操作无法完成"。MOV视频到mp4。但是，相同的代码在 13 之前的 iOS 上运行良好，即 12。我正在粘贴我的完整方法

- (void)encodeVideo:(NSString *)videoURL
{
// Create the asset url with the video file
AVURLAsset *avAsset = [AVURLAsset URLAssetWithURL:[NSURL fileURLWithPath:videoURL] options:nil];
NSArray *compatiblePresets = [AVAssetExportSession exportPresetsCompatibleWithAsset:avAsset];
// Check if video is supported for conversion or not
if ([compatiblePresets containsObject: AVAssetExportPresetLowQuality])
{
//Create Export session
AVAssetExportSession *exportSession = [[AVAssetExportSession alloc]initWithAsset:avAsset presetName:AVAssetExportPresetLowQuality];
//Creating temp path to save the converted video
NSString* documentsDirectory=     [NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES) objectAtIndex:0];
NSString* myDocumentPath= [documentsDirectory stringByAppendingPathComponent:@"temp.mp4"];
NSURL *url = [[NSURL alloc] initFileURLWithPath:myDocumentPath];
//Check if the file already exists then remove the previous file
if ([[NSFileManager defaultManager]fileExistsAtPath:myDocumentPath])
{
[[NSFileManager defaultManager]removeItemAtPath:myDocumentPath error:nil];
}
exportSession.outputURL = url;
//set the output file format if you want to make it in other file format (ex .3gp)
exportSession.outputFileType = AVFileTypeMPEG4;
exportSession.shouldOptimizeForNetworkUse = YES;
[exportSession exportAsynchronouslyWithCompletionHandler:^{
switch ([exportSession status])
{
case AVAssetExportSessionStatusFailed:
NSLog(@"Export session failed");
break;
case AVAssetExportSessionStatusCancelled:
NSLog(@"Export canceled");
break;
case AVAssetExportSessionStatusCompleted:
{
//Video conversion finished
NSLog(@"Successful!");
}
break;
default:
break;
}
}];
}
else
{
NSLog(@"Video file not supported!");
}
}

Answer 1

1.

创建文件夹 -

let filePath = documentDirectory.appendingPathComponent("FolderName"(

if !fileManager.fileExists(atPath: filePath.path) {
do {
try fileManager.createDirectory(atPath: filePath.path, withIntermediateDirectories: true, attributes: nil)
} catch {
print(error.localizedDescription)
return nil
}
}

阿拉伯数字。

Let url =  videoURL
destinationURL = filePath.appendingPathComponent("filename.mp4")
url.startAccessingSecurityScopedResource()
do {
try  FileManager.default.copyItem(at: url, to: destinationURL)
} catch  {
Logging.Log.error("EncodeVideo failed (error.localizedDescription)")
}
url.startAccessingSecurityScopedResource()

3. 现在启动 Mov 到 MP4 它正在工作。