You might have noticed that some of your videos no longer have a Finder preview in Mavericks. Macworld’s Chris Breen discovered that Apple has deprecated many of its older codecs in favor of the iOS-compatible H.264 and MPEG-4. To watch older video files, you must convert them with QuickTime X, install Apple’s professional codecs (if you bought Final Cut Pro, Motion, or Compressor), or use a more capable app like QuickTime 7 Pro or MPlayerX. follow link
Time for a Fetch Refresh?
In the Fetch FTP client, if you see a time stamp like "As of 6/19/10 2:29 PM" above the file list, that means that Fetch is re-using a file list it downloaded earlier. Click the swooshing-arrow refresh button (located beside the time stamp) to refresh the list.
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- ExtraBITS for 4 November 2013 (04 Nov 13)
Why Your Videos Won’t Preview in OS X 10.9 Mavericks