Apple's QuickTime software is extensible via what are called QuickTime Components. You can search for them and download them from the usual sites such as
VersionTracker.com and
MacUpdate.com. Some of them require payment for download. Some of them are specific to certain hardware, such as camera brand. Some are specific to certain software, such as a video editing suite.
AppleMPEG2Codec.component (Sold by and downloadable from Apple. Requires a fee due to licensing)
AviImporter-r7 (Intel).component
CamTwist.component
Canon components (5 total, came with my camera)
CFHDCompressor.component
CFHDDecompressor.component
DivX Decoder.component
DivX Encoder.component
EVO.component
FLACImport.component
Flip4Mac WMV components (3 total, installed as a free package from Flip4Mac)
FLV.component
Google Camera Adapter 0.component
Google Camera Adapter 1.component
jpdmDecoder.component
mp4vDecoder.component
mp4vEncoder.component
MTM.component
Perian.component
XviD_Codec 1.0 alpha.component
xvidEncoder.component
* Of the above, those I personally consider critical for video playback are:
avc1Decoder.component
DivX Decoder.component
Flip4Mac components
Perian.component
XiphQT.component
NOTE that there are many old and outdated components that have been joined together specifically into the Perian component and the XiphQT component. Be sure to read the documentation with each of these components to know what to remove from your system. The outdated components will cause conflict problems with Perian and Xiph.
II) Free player programs that specialize in more obscure video codecs
A) VLC - by far the best and most critical.
B) MPlayer - This player is somewhat equivalent to VLC with some alternative abilities. There are two very different development tracks for this program:
1) The Version 1.x track is still active. The current version is v1.0rc2. You can download it here:
There is also MPlayer OSX Extended which adds new some new features.
It is only compatible with Mac OS X 10.5 and 10.6. Note that it is
somewhat buggy to use.
2) The Version 2.x track was abandoned in 2005. It ended with version 2.0b9r5. It has some alternative features to the 1.x track but is not critical.
C) Movist - This is a very simple player that adds features and playing ability beyond QuickTime, adding in particular the playing features of ffmpegX, listed below.
D) RealPlayer - I very rarely use this any longer. But there remain sights with Real Media video out on the net.
E) MPEG Streamclip - This is a high end tool, but is able to play many videos that nothing else will. You need not delve into its details to simply use it as a player. I never leave home without it.
F) ffmpegX - This is a high end tool that most people will find difficult to set up and use. But it can be very useful. It provides a GUI for a few Open Source CLI video tools.
There are plenty of other players, but the above programs pretty much cover the gamut as alternatives and add-ons to QuickTime.
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If anyone has further useful components and players, please post!
:-Derek