Ketty,  Thanks for posting this.  I just started using Format Factory ver. 3.3.2  a few days ago and it works well.   My native camera video is a mov file 1080p@60fps and I convert to mp4 1080p@60fps.  Staying at 60fps eliminates jitter and video tearing.  Great results.

However,   when I try to join 2 or more videos, I'm asked to download 2 codecs.  I click yes,  then start and I get a " failed to convert" message.  I was able to join some mp3 music files,  but my goal is to use mp4.

I'm using Vista SP2.  Any help will be appreciated. 

PS  I posted an image,  but it doesn't show in forum but it shows in my edit.  Don"t know what I did wrong.