Q: Why No Quick Look with MP4 in Mavericks?
Since upgrading to Mavericks, many movie or video types no longer are available through Quick Look - and must be converted to play through Quicktime. The convertion can take a awfully long time, depending on the movie size.
Why is that - because they worked fine with Mountain Lion.
The most noticeable examples are .MP4's
Posted on Oct 23, 2013 9:28 AM
by Block Rocker,Solvedanswer
For me the culprit were "hint" tracks embedded in the MP4 video.
To remove hint tracks from existing files you can use the excellent "Subler" MP4 muxer/editor (OS/free).
Just delete the hint track(s) in the list, save, voila.
Posted on Nov 4, 2013 11:48 PM