Thus, 4K video footage warnings pop up when you fire up this mode, telling you that the phone might become hot, and you might be restricted in the duration of your video recording. Alternatively, makers compress the output JPEG files too much, leaving you with a manageable size, but lesser amount of details in the photo.
Fret not, however, as there is a way to circumvent these restrictions on your brand new Note 4, thanks to an enterprising developer, who hacked the camera app to lift the more annoying restrictions. Here's what you will be getting:
There are a lot more goods here, such as removing the 5 minute mark that would appear while doing 4K footage, plus the mod will work on both the Exynos, and the Snapdragon version of the Note 4. What needs to be done is, unfortunately, not simply downloading an app and installing it, and the phone needs to be rooted, of course, but you already knew that. Here's what needs to be done to install the mod:
1. If you have custom recovery installed, and if you've already rooted, we can't imagine why wouldn't you, simply flash the Note 4 camera mod zip, and that's that;
2. If you want to take the high road, use ES File Explorer, or any other app that will give you root system files access, go to /system/app and delete the old SamsungCamera3.apk and SamsungCamera3.odex files, or stash them away in case something goes wrong;
3. Grab the respective Exynos or Snapdragon versions of the SamsungCamera3.apk that is in the zip file you downloaded in step 1, and copy it to the /system/app folder, then copy the media_profiles.xml file that is in the same zip package to the /system/etc/ folder. Don't forget to set rw-r-r permissions on both newly-copied files;
4. All you need to do now is reboot the Note 4, and marvel at your newly-found camera freedom with your powerful handset.
source: KevinRocksman (XDA-Devs)