There are two videos showing a Sony A7s camera hacked to record 4K video internally. The video comes from YouTube user Nabil Fathi, and it comes with the following description:
This is just a teaser of upcoming hack similar to magic lantern that will be available for the Sony a7s, possible on the a7s II but not sure yet.
Higher bitrate, better subsampling (HDMI 10-bit 4:2:2), 4K recording, etc… (Do not misunderstand this part, what you see on the video, it is a simple port for fun, have a custom app that offer clearly more than that to come. This video doesn’t show anything related to 4K, simply related to a7s access).
The videos can be seen here:
I have no idea if this is a real “hack” or it is just an APP with modified menu and no real new functions. But if it is true…the latest Sony cameras have an Android based system that allows to install apps from the proprietary Sony PlayMemories Camera app store – this is probably what this hack is based on.
Note: If you are a Sony Camera User, you can now join the Sony Camera Users Facebook Group to share your Sony photography and advice, ask and answer questions that arise and help each others!
Sony Camera Users: https://www.facebook.com/groups/SonyCameraUsers