Some applications may output no audio, but system alert sounds and iTunes playback can be heard

With QuickTime 6, applications that use QuickTime for audio may change your computer's audio settings to a sample rate that is too high for other applications to use. In this situation, system alert sounds and iTunes audio still work, but other applications may have no sound (audio output).

This article has been archived and is no longer updated by Apple.

Use Software Update to download and install a later version of QuickTime, as well as any other available updates.

Third-party audio applications

Some third-party audio applications may change your computer's audio output setting, even after you update QuickTime is up-to-date.

Watch the settings in the Audio MIDI Setup application both before and after running a third-party application that you suspect might be causing the issue:

  1. Open Audio MIDI Setup (located in Applications/Utilities)
  2. Examine the Audio Output setting.
  3. Change the Audio Output setting to 44100.0 Hz.
  4. Quit Audio MIDI Setup.

If the application is affecting your audio output settings, contact the manufacturer of the application for more information or assistance.

For example, if you play an Internet movie in Safari, it may make no sound even with the volume turned up. If you open a QuickTime movie on your computer, QuickTime Player may report the following alert (and the movie will have no audio):

"You may experience problems playing a sound track in (movie name).mov because a software component needed by the movie could not be opened."

This can happen on Macs that support high sample rates (higher than 48000 Hz), including these:

  • MacBook (all models)
  • MacBook Pro (all models)
  • Mac Pro (all models)
  • iMac G5
  • Mac mini (all models)
  • Power Mac G5 models that support sample rates higher than 48000 Hz
  • PowerBook G4 support sample rates higher than 48000 Hz
  • iMac (Early 2006) and later
Published Date: