OSStatus错误-12769？

Question

所以我一直试图用AVAssetExportSession来修剪一个正方形的视频。但出于某种原因，我总是犯这样的错误：

Error Domain=AVFoundationErrorDomain Code=-11800 "The operation could not be completed" UserInfo=0x1a03be70 {NSLocalizedDescription=The operation could not be completed, NSUnderlyingError=0x1a04c5e0 "The operation couldn’t be completed. (OSStatus error -12769.)", NSLocalizedFailureReason=An unknown error occurred (-12769)}

从苹果的网站上，我发现-11800是一个未知的错误，但是OSStatus error -12769呢？我在互联网上到处搜索，没有发现任何与这个错误代码有关的问题。请帮帮忙。谢谢!

我的密码是：

AVAsset *asset = [[AVURLAsset alloc]initWithURL:self.originalVidUrl options:nil];
AVAssetTrack *clipVideoTrack = [[asset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
if (clipVideoTrack.naturalSize.width==clipVideoTrack.naturalSize.height) {
    NSLog(@"Square video");
    NSArray *presets = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
    if ([presets containsObject:AVAssetExportPresetHighestQuality]) {
        self.exportSession = [[AVAssetExportSession alloc]initWithAsset:asset presetName:AVAssetExportPresetHighestQuality];
        self.exportSession.outputURL = [NSURL fileURLWithPath: self.tmpVidPath];
        self.exportSession.outputFileType = AVFileTypeMPEG4;
        CMTime start = ...
        CMTime duration = ...
        CMTimeRange range = CMTimeRangeMake(start, duration);
        self.exportSession.timeRange = range;
        [self.exportSession exportAsynchronouslyWithCompletionHandler:^{
            switch ([self.exportSession status]) {
                case AVAssetExportSessionStatusFailed:
                    NSLog(@"%@",self.exportSession.error);
                    break;
                case AVAssetExportSessionStatusCancelled:
                    NSLog(@"Export canceled");
                    break;
                default:
                    NSLog(@"Export Success, File Saved.");
                    break;
            }
        }];
    }
}

本代码适用于与本机相机应用程序拍摄的视频(即非正方形/非处理视频)。

Answer 1

我想我找到了解决办法，但我不知道为什么，也不知道它是如何工作的。

只需将预设的名称从AVAssetExportPresetHighestQuality更改为AVAssetExportPreset1280x720，就可以了！