When I started making video content for my websites I dicided to use Flash as it's the most common format so avoids most users having to download a plugin or whatever. (I used Flowplayer on the websites.) At the time I was just using Adobe Premiere Elements and as it could output to Flash I thought that would be fine. It was OK, but to be honest it was a bit blurred and if you clicked on Full Screen it was awful. For various reasons I upgraded to Final Cut Pro and (once I'd learned to use it) the quality of my video editing got better, but as FCP has no Flash output I was exporting my Quicktime files to a memory stick and going back to my PC with Premiere on it. Result: my videos were still blurred.
I had over-stretched the budget buying FCP and a Mac (£ ouch), so I trawled the internet to find out what free or very cheap software I could get for converting my files to good quality Flash. I tried various things and frankly I struggled to find anything that convinced me. Then I found out a little secret that seems not to be widely publicised. Using the appropriate settings in FCP you can make a Quicktime file with H.264 and then just - er - change the file extension from .mov to .flv. Hey presto! Embarrassingly simple. Great quality Flash video files that play on my site.
Maybe everyone else in the world knew this already, but I was really pleased when I found out so decided to share the info here.