Hosted on Google Code, Subler (by Damiano Galassi) is an open source application for Mac OS X that enables you to mux .mp4 files. For those who don’t know ... not to mention full Quicktime ...

Open the MP4 file in QuickTime Player. Click on “File,” then “Export As,” and choose your desired resolution. Save the file as a MOV. It’s as simple as that! QuickTime Pro handles the ...