In HTML5 times probably have to embed a video but tools like mouser's output huge videos, have to read on compression or just create a good quality gif.
Same thing with ffmpeg, simple commands don't work, the same 0 seconds output as the video convertors above.

Will try ffmpeg and swifty, thanks. Can I get the exe please? It is not available on the site I believe

In previous times (not related to this swf) no matter what I did screentogif looked like it lost quality or resolution, played with frames and every other setting in it and still never understood why.