Warning: [Video] Recording Failed I recently got a Samsung Galaxy S7 Edge, and was using it just fine. I imported all of my previous apps and app data and everything went smoothly.

Then, a few weeks later, I tried to record a video, and received the popup:

Warning: Recording Failed


This only happened with the video, and NOT with regular pictures (I could capture still images)

I've tried:


Taking out the microSD card
Formatting the SD card
Restarting the device
Clearing camera cache and data
Clearing system-wide cache partition
Factory data reset


Option 6) actually solved it, so I think it may be the cause of an app. What's going on?
The culprit is probably an app that accidentally doesn't release a critical lock.

In my case, it was the Cortana app that was causing the issue. It has a setting for the "Hey Cortana" hotword in the app, which requires that the application grab the microphone lock. It seems like the app, when quit, never released the lock, and so the camera couldn't have access to the microphone (and couldn't record)

If you don't have Cortana, try scouring your app list for apps that will obtain a lock for (and have the possibility of keeping it across runs):


Microphone
Camera
Storage


P.S. I've also heard that this issue can be caused by interference from Smart Stay, but I've never had issues with it