Encoding Audio Streaming through FMLE

Hi Guys

  Would be really helpful if someone can assist me on this. Let me introduce myself. I am Ganesh, basically a video analyst. We do streaming for major clients using FMLE and Akamai as the CDN. Now we need to stream only audio through CDN. We tried to contact out CDN who told that it is possible through a MP4 Container. But i am totally unaware of what an mp4 container mean. Device i am using to bring in the Video is Canopus ADVC 110. Will be helpful if someone can suggest me how to stream Audio or can refer any such mp4 converters.

Thanks in Advance

Regards

Ganesh S