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Robert,
Both previous answers are correct.
Dying abruptly after about 30-45 minutes is classic for a coil failure. You should carry a spare. They're not expensive and not hard to replace.
Video sounds like a fuel issue - the engine is trying to start.
So, which is it?
Recommend you carry a can of starting ether. A short blast will tell you whether you have spark failure (engine just cranks) or a fuel issue (engine start and runs on the ether for a few seconds).
Strongly recommend you establish and maintain a clean fuel system. Start with the tank by pulling a sample (a gallon is plenty) from the bottom of the tank. The fuel pickup for the engine does not go to the bottom! Not sure of your tank arrangement - with my Tartan 30, access is through the fuel fill with a length of copper tubing. A small hand pump or outboard primer bulb will pull out a sample. Once the tank is clean, you can work back towards the engine.
The original stuff is 40 years old, and is all suspect. Fuel hoses rot and shed flakes, filters corrode internally, etc. And all the debris ends up clogging filters, causing valve failures in the fuel pump or float valve, or plugging jets in the carburetor. You can spend a lot of lost sailing time tracking this stuff down.
The Atomic 4 is a good engine. Don't let anyone tell you otherwise.
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