If you have ever uploaded a video to Facebook or YouTube from your iPhone 4, you might have noticed a drop in video quality. No, it isn’t poor lighting, the resolution and frame rate are actually lowered. This is because a reduced quality video is produced before uploading, to save on internet bandwidth usage.

A 1280 x 720 video, 9 minutes in length, is about 700 MB natively. When trying to upload a video to YouTube or Twitter, the file size gets reduced to less than half that. To get full HD quality, you would typically need to transfer video from your iPhone to your computer and upload from there, but not with True HD…

This Cydia tweak will allow you to upload full HD video from your iPhone 4, without worrying about a loss in quality. It does this by removing the cap that limits your uploading file size, much like removing a governor from a car engine to remove its top speed limit.

Once downloaded, there is no home screen icon or tab in the Settings.app. The developer claims that after it is installed, True HD takes care of the rest. Just upload your HD videos like normal and you’ll notice the difference.

This could certainly be a huge time saver for folks who need to upload 720p videos, but don’t always have their computer with them. True HD is said to work with Twitter, Facebook, MobileMe, and many others. The app’s author even notes that it has been tested with the latest jailbroken firmware 4.3.1.

It is important to note that this will obviously increase upload times, as file sizes will undoubtedly be larger. This may also be a red flag to users who don’t have unlimited data plans with their wireless carriers. For those of you who are looking to try out the tweak, it’s available for free in Cydia.

Have you tried True HD? Do you use another app or tweak to upload 720p video?