How to extract orientation information from videos?

Question

After surfing through tons of documentation on the web it seems that the iPhone always shoots the video at a 480x360 aspect ratio and applies a transformation matrix on the

Answer 1

I have extracted on iOS using an AVAssetExportSession, AVMutableComposition and the input AVAssetTrack's preferredTransform. I concatenate the preferred transform with a transformation to fill the target size.

After exporting to a file, I upload using ASIHTTPRequest to my rails server and send the data to Amazon S3 using paperclip.