When you need to put your favorite MP4 videos on the web, Mac MP4 to FLV Converter is your best choice to convert MP4 to FLV format for Internet on Mac OS X.
Step1: Select one version to install:
and launch it, you can see:

Step2: "Add Files" button is to select some mp4 files.
Step3: "Output Format" button is to default the output format.
Step4: "Browse" button is to set the destination folder.
Press"settings" button to customize your advanced video settings, at the same time, you also can tick before"Merge into one file" to join all the converted files together.

Step5: "Start" button is to start converting mp4 to flv on mac os x.

All right, we have successfully finish converting MP4 to FLV on Mac, and you can put these videos on YouTube.com and enjoy them.
Easily Convert MP4 to FLV on Mac OS X |