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can’t preview movies in Finder?

One of the features I really love in OS X is the ability to preview anything by selecting the file in finder and pressing the spacebar – formally called ‘Quick Look’ – without actually having to open the full app. This is great for both music and movies.

However, if you uninstalled Perian or Flip4Mac or haven’t updated them recently, you will find that a lot of movie files – like .avi, for example – which are not fully supported in QuickTime won’t preview. The answer is to get the latest versions of these two plug-ins:

Perian 1.2.3


(hit the green download button (free), ignore the one trying to sell you a paid version).

You should then be able to see any movie using Quick Look.


Related Posts
QuickTime won’t play my video

no sound or volume after upgrading

A problem that seems to be affecting quite a few users after the Mountain Lion upgrade is loss of sound in iTunes, QuickTime and other apps. Some people are reporting that the Volume control is greyed out or won’t move.

The resolution here is to quit and resart the coreaudio process. To do so:

1. Open Activity (Applications > Utilities > Activity

2. Select ‘All Processes’ from the drop down menu next to the search bar (called ‘Filter:’) and type in ‘coreaudio’.

3. Select the process name and click the ‘Quit Process’ button at the top. Chose ‘Quit’ or ‘Force Quit’ from the resulting dialogue box.

The coreaudio process will automatically restart itself (if you look closely at the PID number in Activity Monitor you’ll notice it changes after you hit ‘Quit’) and your sound problems should be solved. However, if you find that this procedure only partially solves the problem or doesn’t work for you, also try this:

4. Open (Applications/Utilities/ and copy/paste this command into the Terminal window

rm /Library/Preferences/

then press ‘return’ on your keyboard.

5. Restart your mac and test.

6. Still not working? Check your audio configuration here:

/Applications/Utilities/Audio MIDI

Make sure the window has the title Audio Devices, and click ‘Built in Output’ in the sidebar. Are any of the boxes under ‘Mute’ in the main panel checked? If so, uncheck them. Is the format set to 44100.0hz? If not, change it so that it is.

Hope this helps!


change the default app for a file type

OS X is known for its intuitive and simple way to achieve common user tasks, but one area where it fails is in setting or changing the default app to open a given file type. New OS X users migrating from Windows may find it especially frustrating given the ease with which this can be done in Windows 7 and so on. How, for example, do you make all your video files open with Quicktime instead of VLC by default or pdf files to open with Acrobat instead of Preview?

Here’s the answer:

1. In the Finder, select any file of the given type you want to change.

2. Using the keyboard, press Cmd-i or right-click on the file to display the contextual menu, and chose ‘Get Info’.

3. About 2/3rd of the way down the tall dialogue box, you should see ‘Open with…’ and a menu button. Click on the menu and choose the app you want.

4. After clicking on your preferred app, click the ‘Change All…’ button. This means that not only this file, but all files with the same extension will open with the app you just chose.

5. Press Cmd-w on the keyboard or click the red ‘Close’ button in the top-left corner to close the dialogue box.

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