I recently purchased iFFmpeg (and like it). The screen shot for Miro looked remarkably similar and so I checked it out and, yes, this is another GUI front end for FFmpeg. Miro is simpler than iFFmpeg which may be a good thing for many. But if you want to tweak more stuff, then a more full featured GUI would be useful. Conversion times for identical movies are virtually identical to other FFmpeg-based converters.

Miro is easy to use and does what it says. But the new UI for version 3 is just horrible. What were they thinking?

Excellent app - better than most of the paid apps. It just works. The only format I have to use another tool for is swf/flv. Gets my html5 video processing done nicely.

While I do use Handbrake for most of all my converting needs, Miro is great for making quick conversions for the web (Theora for example) when you don't need to tweak the video. It's three step process -- select video, select output format, and convert -- makes it simple to use.

(The only format I ran into problems with was 3gp)

Anybody know if this will properly convert a NEW matroska type file with soft subs, into an AVI/MP3 or MPEG4/AAC with burned in subtitles? The new matroska encodes do not work under Perian at all (even if demuxed), so if it hooks into either Perian or the system, it won't work, and a large number of older mkv files have other issues including syncing, speed, fps, etc.
I'd test it myself, but I'd have to install Leopard just to test it, and that isn't worth it, if this plainly can't do it.
--TIA