Firefox plays default content SWFObject with Flash player ok

Hello,
I use SWFObject to define HTML 5 video content as a fallback to flash video, basically in line with the instructions given here:
http://gotoandlearn.com/play.php?id=128
code is:
<script type="text/javascript">
swfobject.embedSWF("test.swf","player1","938","533","9");
</script>
<div id="player1">
<video src="video.mp4"
controls="controls"
autoplay="autoplay"
autobuffer="autobuffer"
height="533"
width="938">
</video>
</div>
This was a stable solution until very recently, when Firefox 21.0 started to play both the flash content AND the fallback video content. Chrome, IE etc are ok. Flash Player 11.7
Any ideas?
Thank you -
Jay

Hi, Chris,
indeed the issue has come up with regard to youtube's HTML5 testing:
http://forums.mozillazine.org/viewtopic.php?f=38&t=2487395
Let's see what the Firefox guys say.
Thanks -
J

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Thanks.
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Texas Mac Man's Flash hack/post...
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Windows XP SP3 32bit, latest updates applied
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Yes.
Victory is mine.
VICTORY IS MINE!!!
Solution:
Go to C:\WINDOWS\system32\Macromed\Flash\mms.cfg
Set
AVHardwareDisable=1
to:
AVHardwareDisable=0
Restart your browser. Done. Camera works now.
I really want to shout this solution from the rooftops, because try Googling the solution sometime. I did. I failed. You will too. Hopefully if I use some more 18-point bold font, Google will index it faster, because that's the way it works right?
I actually had no idea that Flash Player has a folder in Windows\system32 at all, and I definitely had no idea that this file existed. I am guessing some stinking app I installed decided I needed AVHardwareDisable set to 1 for some reason (effers). I found out about the location by just lazily searching through the windows registry for "Flash Player" and eventually saw it pointing to that directory. A little more poking around and I found this file.
Those of you who actively support this forum: please keep this in the back of your mind, next time someone has audio/video input problems with Flash Player. I've found an awful lot of forum posts from people with cameras not working, and I bet a good portion of them need this fix. Reinstalling Flash Player will not fix it. Here's hoping the solution comes up in Google for the next unlucky soul.

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