Please. What you claiming here is that were it not for software patents, there would practically not be digital video. That is just rubbish.
The reason patented codecs were invented before the non-patented ones is simple. What proprietary software company would not apply for a patent when they could? Why would such a company want to minimize their profits?
If software patents were not available, those wanting to bring digital video the market would do it just the same. Their implementations would be copyrighted, which would give them decent market advantage. If their implementation was constantly improved, this would keep their market advantage for a while.
Asking proprietary software industry whether they like software patents or not is like asking a used car dealer if the car you are pointing at on his lot is good. It's the best, of course! The credibility of the one making the statement is what should be questioned, though.