Use the recording time calculator. Clear space by offloading unused apps and moving old videos off the phone.
Safe / Checking storage before a long shoot
Guide
Checking storage before a long shoot
Short answerCheck Settings › General › iPhone Storage, estimate with a recording-time calculator, and leave at least a few gigabytes spare so the phone doesn't slow down or stop.
About Music Wide Selfie
An iPhone camera app in development for people who film themselves. Not released yet; one email when it is.
One email when the app is ready. Nothing else.