ios - 需要有关 AVAssetExportSession 的帮助

Question

        NSArray *pres = [AVAssetExportSession exportPresetsCompatibleWithAsset:asset];
        if([pres containsObject:AVAssetExportPreset640x480]) {
            AVAssetExportSession *session = [[AVAssetExportSession alloc]initWithAsset:asset presetName:AVAssetExportPreset640x480];
            FileManagerUtilities *fUtil = [[FileManagerUtilities alloc]init];
            session.outputURL = [NSURL fileURLWithPath:[fUtil searchPathDirectory:NSDocumentDirectory byAppendingDirectoryPath:nil andFileName:@"tempVideo.mov"]];
            session.outputFileType = AVFileTypeQuickTimeMovie;
            session.fileLengthLimit = 10.0;
            [session exportAsynchronouslyWithCompletionHandler:^{

                switch ([session status]) {
                    case AVAssetExportSessionStatusFailed:
                        NSLog(@"Export failed: %@", [[session error] localizedDescription]);
                        break;
                    case AVAssetExportSessionStatusCancelled:
                        NSLog(@"Export canceled");
                        break;
                    default:
                        break;
                }
            }];
        }

我正在尝试将 session.fileLengthLimit 设置为 10mb，但不知道我犯了什么错误。无法将大小限制为 10mb，如何将 fileLengthLimit 设置为 10mb。

Answer 1

fileLenghtLimit 应以字节为单位，即:

session.fileLengthLimit = 10*1024*1024;