ios - 如何在 iOS 上从相机胶卷中获取特定时间间隔的视频？

Question

我需要拍摄视频的特定时间间隔。例如;最后40秒。我已经找过了。但连一丝线索都找不到。

您能帮忙或告诉我一种方法吗？

BR，

Answer 1

这可能会帮助你:

        AVURLAsset *videoAsset = [AVURLAsset URLAssetWithURL:videoURL options:nil]; 


        AVAssetExportSession *exportSession = [[AVAssetExportSession alloc] initWithAsset:videoAsset presetName:AVAssetExportPresetHighestQuality];
        exportSession.outputURL = [NSURL fileURLWithPath:outputURL];
        exportSession.outputFileType = AVFileTypeQuickTimeMovie;
        CMTimeRange timeRange = CMTimeRangeMake(CMTimeMake(startMilliseconds, 1000), CMTimeMake(endMilliseconds - startMilliseconds, 1000));
        exportSession.timeRange = timeRange;

        [exportSession exportAsynchronouslyWithCompletionHandler:^{
            switch (exportSession.status) {
                case AVAssetExportSessionStatusCompleted:
                    // Custom method to import the Exported Video
                    [self loadAssetFromFile:exportSession.outputURL];
                    break;
                case AVAssetExportSessionStatusFailed:
                    //
                    NSLog(@"Failed:%@",exportSession.error);
                    break;
                case AVAssetExportSessionStatusCancelled:
                    //
                    NSLog(@"Canceled:%@",exportSession.error);
                    break;
                default:
                    break;
            }
        }];