Watching one of these live just brings home exactly how low activity a baseball match is. You can easily miss a pitch if you're not actively watching it and keep your attention span on it. It also brings to mind how much the commentary during a game keeps the viewer engaged. Live video and a good director cutting to different cameras also helps. Radio with out the color would be insanely boring:
Here's the pitch, low and outside.Ball 1.
30 secs of silence.
Here's the pitch, fast ball down the middle. Swing and a miss. Count is now 1-1.
30 secs of silence.