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
Copy Existing Filename to 'Save As' Field
While many utilities provide file naming automation, they're mostly overkill for those cases when you need to make small variations in file content while ensuring the documents group together in a "by name" list.
In the Save As dialog, the default name is the current document name. You can quickly change this to match any existing file.
1. Make the list of files the active element.
2. Click on a grayed-out filename, which momentarily turns black.
3. The Save As field now contains the filename you just clicked.
You can modify the name (adding, say, "version 3") or overwrite that existing file you clicked.
- ExtraBITS for 4 November 2013 (04 Nov 13)
Why Your Videos Won’t Preview in OS X 10.9 Mavericks