Pull Single Frame from Video Feed (DJI Mobile SDK)

I am making a DJI Mobile SDK app and have setup an application that gets live video from the drone and displays it in a view, but I need to pull a single frame from the video feed to work with and cannot figure out how to do it!

One method would be to take a picture with the drone and then download it from the SD card, but I do not require the full resolution image and it feels like there must be a simple method to just get a single frame from the video preview.

The code which casts the video stream is:

-(void)videoFeed:(DJIVideoFeed *)videoFeed didUpdateVideoData:(NSData *)videoData {
    [[DJIVideoPreviewer instance] push:(uint8_t *)videoData.bytes length:(int)videoData.length];
}

any ideas on how to pull an individual from from the feed? Or maybe is there a way to have an iOS app just take a screenshot and work with that?

Thanks!

Im not very familiar with IOS. for android there is a sample which use DJI msdk to grab the still images and use the image for Panorama stitching https://github.com/DJI-Mobile-SDK-Tutorials/Android-PanoramaDemo.

The equivalent IOS version of Panorama stitching is here. https://github.com/DJI-Mobile-SDK-Tutorials/iOS-PanoramaDemo

Maybe you can get idea on how to grab the still image from there.