I have an iMac DV 400, running OS 10.2.8, and could not get AVI movies to play at all ... but now I can get most to play.
I had tried all the different players (VLC, MPlayer, etc.). Nothing worked very well. I even tried the Divx 5.2.1 codec, but that didn't work. Somehow, I remembered a window I had seen before while clicking around the system. If you go to your System Preferences, click on QuickTime, click the Plug-ins tab, and then click on MIME settings, a window will drop down. Turn on all the settings you want your QuickTime Plug-in to handle; only one was checked the first time I opened it. I turned them all on, and now QuickTime will play all Divx AVI with the Divx 5.0 format. It won't, however, play the WMV3 format or the IV41 format.
[robg adds: The newer QuickTime prefs panel is a bit different; you'll find the plug-in settings on the Advanced tab -- click the MIME Settings button at the bottom of the screen. This hint probably isn't required for newer systems; the AVI box was already checked on my QuickTime installation (under 10.4.2), and I know I never checked it.]
I had tried all the different players (VLC, MPlayer, etc.). Nothing worked very well. I even tried the Divx 5.2.1 codec, but that didn't work. Somehow, I remembered a window I had seen before while clicking around the system. If you go to your System Preferences, click on QuickTime, click the Plug-ins tab, and then click on MIME settings, a window will drop down. Turn on all the settings you want your QuickTime Plug-in to handle; only one was checked the first time I opened it. I turned them all on, and now QuickTime will play all Divx AVI with the Divx 5.0 format. It won't, however, play the WMV3 format or the IV41 format.
[robg adds: The newer QuickTime prefs panel is a bit different; you'll find the plug-in settings on the Advanced tab -- click the MIME Settings button at the bottom of the screen. This hint probably isn't required for newer systems; the AVI box was already checked on my QuickTime installation (under 10.4.2), and I know I never checked it.]
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