What is Buffer Underrun? [closed]

Question

Just what the title states - What does Buffer Underrun mean?

Answer 1

It's when a buffer that's being read from (and should preferably always have data available) runs empty.

An audio output device is a good example. An audio device will read its buffer at a constant rate, and unless you keep supplying it data at a fast enough rate, the buffer will run out. And it'll sound nasty.