I could hear it but can't quite make it out like PwrSmoke wrote.
However, if you can get your hands on a "mechanics stethoscope" you can probe the area and literally hear the approximate source. Their about $20 and worth every penny. I can't tell you how many times it has helped me out.
A bad rod bearing sounds like a big marble rolling around in your oil pan. Put a stethoscope to it and it sound like a hammer striking a block of steel. You can practically tell which bearing is bad with one. That's if it is the problem.
Yeah, sorry about the video. It doesn't sound like a marble just that knock you hear in the video. Sounds like "normal" tap/knock on video. It is louder on passenger side and then as you go lower on the quarter panel it gets louder. It is loudest on low side of engine right in front of the starter. Anyway, I agree with the mech steth. Truck is 25 miles away so I'm trying to gather as much info before I head out to buy/rent gear and I have to let the business owner I subcontract plow for what my deal is before snow storm today.