qtmodernizer
qtmodernizer is a command line tool to examine a media file which may be in a legacy format or may contain legacy media tracks. In this case a legacy format is one which cannot be read directly by CoreMedia or AVFoundation frameworks.
qtmodernizer examines all the tracks to determine if they are all in a form that can currently be played. If all tracks are playable and the format is readable, qtmodernizer does returns and does nothing. If any of the audio or video tracks are encoded with a codec that CoreMedia does not support, that track will be converted to a modern format, usually H.264 for video and AAC for audio (see --useprores for other choices).
This was added in Mac OS X 10.9. It’s probably a good idea to update any old media files that you have now.
