I am presently having QuickTime plug-in not playing certain type of video formats. It launches the QuickTime player from the browser both in Safari and Firefox but it does not play the actual movie. Presently below are the notes I am taking for what to do to fix the issue.
Check The Location of The QuickTime Plug-In
Plug-ins are located under /Library/Internet Plug-Ins There is the same directory under ~/Library/Internet Plug-Ins as well. On a fresh out of the box Macs neither locations contain anything.
Check the QuickTime CODEC Installations
Extra and third party CODECS ones are usually installed at /Library/QuickTime
Popular CODECS and CODEC Utiity download sites:
- Apple QT component list: http://3ivx.com/download/macos.html
- 3ivx: http://3ivx.com/download/macos.html
- Perian.Org http://www.perian.org (Especially popular with people having problem with playing the AVI)