What is the best video converter software for Mac?
I always use wondershare video converter for mac. I think it's very professional. You can download it and try it.
There isn't really a best video converter ~ all have their strengths and weaknesses, features and shortcomings.
In general I would say that MPEG Streamclip is one of the most powerful converters.
Another very good option is iFFmpeg which basically is a GUI front end to ffmpeg.