How to convert a .mp4 video to .ogv?

Hi

In addition to using Edge Animate I also have After Effects and the Adobe Media Encoder.

Does anyone know how to convert a .mp4 video that I created and exported from After Effects to the .ogv format?

Sadly, it looks like I need the .ogv format to get my Animate preso to play in Firefox. Videos embedded into Animate with .mp4 play great on everything except Firefox; Animate docs suggest generating a second HTML5 compliant video type and importing it into Edge Animate....

Thanks in advance,

Rich