Welcome to FK. You posted this in the Coffee Lounge which is strictly off topic, not for flash support. Since you are not asking for code assistance I moved this to Flash Newbies.

As I'm sure you've discovered, using File -> Export doesn't work in most cases. This is because that feature only exports the frames of the main timeline. If you had five frames in the main timeline and the last frame had a movieclip on the stage with 30 more frames of animation, your exported .mov is only going to be those first 5 frames. Adobe should have built a better exporter by now but it would be pretty hard to know exactly when to stop. Plus if you have animation controlled by code it would not know where the "end" is.

So yes, you will need a very fast computer with ishowu's capture settings set very high. This will allow the swf to play back at full speed without dropping a frame and ishowu will be able to capture it to disk at a high resolution without dropping frames either.

Option A isn't really an option because there are no converters (that I know of) that do all of the things I mentioned earlier.

Hopefully you can find someone with a strong enough rig to help you with Option B.

There is sort of an option C. A set of tools have recently been released that assist in converting your timeline to html/javascript. Check out CreateJS. I'm not if it will work with MX.