Basically, as I've experienced it, QuickTime doesn't always allow plugins to get all the access they need to a file in order to work their magic. Safari has been one of those cases for me not infrequently.
(The documentation situation for QuickTime Plugins is frankly dismal, and the last response I got from folks at the mothership was that the current API is deprecated and won't be documented or enhanced.)
>
>
> On Tuesday, May 29, 2012 11:23:16 AM UTC-7, Swift2 wrote:
>>
>> Well, I'll take a stab. It's because Apple has given out the
>> information on how to write a plugin for QuickTime to play files made
>> with other codecs. Perian has found out ways to include old codecs,
>> including Windows-type files. (Not newer Windows formats, like .wmv.
>> But Apple only wants a limited number of codecs played in Safari. H.
>> 264 mostly. Adobe makes the Flash plugin. Making the QuickTime plugin
>> easier to add codec support to in Safari? The browser is an "attack
>> surface" for viruses. And look at all the updates to Flash: most for
>> security. If bad guys can attack Flash, they can crash it and gain
>> control of your computer. Apple supports a lot of codecs. Look at a
>> list of them in Safari, under Help->Installed Plug-ins. But with the
>> <video> tag coming, plug-ins are going away.
>>
>> On May 28, 2:19 pm, Safari <
me2u1...@gmail.com> wrote:
>>> I have Perian 1.2.3 with my Mac OS X 10.4.11 on a G4 Mac PPC. Thanks to
>>> Perian, I can play DivX - Xvid videos out of Quicktime form my Desktop.
>> But
>>> I can't play the same ones using Quicktime in my Safari 4.1.3 browser.
>>>
>>> Why can't I play those videos out of Safari, which is using Quicktime to
>>> play videos? What do I need to do to accomplish this?
>>>
>>> I note, Perian is the only thing I can get with this OS to play Xvid -
>> DivX
>>> videos.
>
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