NextVideoConverterExpress
The app convert most popular video formats to MP4, MOV, AVI, WMV, and FLV.
NextVideoConverterExpress provides an easy way to convert most popular video formats to MP4, MOV, AVI, WMV, and FLV on Mac OS X.
This tool can help you trim video/audio to get video/audio clips and just convert a certain part of the source file. In addition, it allows you to merge all files into one file after convertion.