What can you advise for recording an Instagram broadcast?

Question

Android

The goal is this: you need to record an Instagram broadcast (duration about 2 hours)
There is an option to use a smartphone and a recording program, but there is a problem with the sound (I want to put it so that it just writes the broadcast, but if I turn off the sound or plug in the headphones, then on the recording there will be no sound)
Maybe there is a way to watch these broadcasts on a personal computer?