I have been shooting some video lately with the EOS-M and notice the video files are much larger than comparable files from my Oly EM5 or Panny GH1.
EOS M doesn't compress audio into a lossy format. It records audio in Linear PCM. This could affect file sizes a fair bit.
|Carla... by lickity split|
from Beautiful caucasian female faces
|Lunar New Year Fireworks by Michael L NYC 99|
|Vatican Basilica by wam7|
from Street lights