I have a ton of files I need transcribed, and I'm sharing them with our transcriber via Dropbox. Right now, the files are m4v files. I want to shrink them further. I try using MPEGstreamclip but too often the file size gets even larger! The quality of the video isnt a big issue since it's people transcribing audio. I looked into making them AVI files, but even then, I'm not sure what file type to make them. Once you choose AVI, MPEG asks you to then pick a type of compression codec and there are a million options. So...suggested settings vis Hanbrake or MPEGStreamclip for shrinking these small files even further?