quick time player not working

When doing a screen recording, you have to select what the audio input (microphone) is. That is selectable with the little arrow to the side of the record button.

By default, audio input is done by microphone (internal or external), to add your own voice-over.

With a little trickery, internal/“system”-audio can be recorded with additional software.

Hello,

When doing a screen shot recording everything seems well, but after 5 minutes of recording the screen goes black, but i can still hear the sound?? what should i do?