I was always baffled by ffmpeg, after many attempts to use it through the terminal I finally gave up and admitted defeat.
After a while I decided to give iffmpeg a go and I am surprised at how easy it makes the task seem. I like having the commandline on view as well so I can see the mistakes (just about everything) I made when trying to use ffmpeg without this app. It is also nice to see what is really happening when a program is running.

Some things I would like to see in future builds are.

1: Be able to resize the window.

2: Be able to un-tick some files when the process is running without having to stop the the current tasks.

Minor little things that do not affect the quality of this app I know, but it is the little things that make some of us happy.:-)

Overall I am impressed.

I have just done a fresh install (end of year clean) and this is always one of the first apps to be reinstalled.

I do not like messing with the OS as I tend to mess about too much and break things, so to have a tool that will do these jobs for me is a must.
Onyx is easy to use and the support is first class, that is all I ask for with any app.