MPEG-1 MUXED - audio playback disappeared

Hi-
I've got a problem playing MPEG-1 muxed clips, the audio isn't playing back. Happened couple weeks ago, then fixed itself (maybe a codec expiry problem?), now I the sound is dead again, also QT is stalling after 10 secs of video playback..
Here's the details of the clip:
MPEG1 Muxed, 320 x 240
Comp is iMac G5, running Tiger 10.4.3 and QT 7.0.3
thanks in advance for the help!

wow Kirk, thanks for the tip, that fixed he problem strait away-
I'd been searching for awhile, googled, QT help, nothing - I didn't know the MIDI Setup controlled QT playback, and wonder why it changed to 96000 all of a sudden - maybe it changed after I played back a clip with that setting....
anyway, looks like I'll be able to solve that problem in future, its really the only one I've had in years of using QT -
thanks again!

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I really need help from you wizards...
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Hi Scrapesuiter
Nope, I use Itunes to handle MP3 files and they play fine....I also checked the Audio Midi setup. I've rolled back my version to 6.5.2 and everything is hunky dory...It could be a system issue that would require a clean install. When I get time I may just do this.
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What you say is essentially true. However, IMHO there is a reasonable expectation that the item "plugged in" will be of the same form of technology as that into which it is plugged. For instance, I would never expect to "plug" a V2 rocket engine into a 1969 XKE Jaguar in place of the standard 6.2 liter gasoline engine and expect it to simply "work out of the box." Not all video is equal. MPEG-1 and MPEG-2 muxed compression was not invented by Apple, the exclusive right to its use does not belong to Apple, and the spatial synchronization technology involved is different than Apple's own temporal synchronization technology.
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This is not a technical issue. This is a usability issue. i refuse to trawl through my photo collection, re-encode them (even by batch process) and save back to their original locations.
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(Long post; apologies in advance.)
I needed to get around the MPEG Streamclip "no audio" problem that other people here have had. I just found a workaround that more-or-less works for my specific situation ... and it's free to boot.
Since other people are having this problem, I thought I'd let you know what happened to me, so you can decide if this is something you want to try. If you do, I suggest posting replies here so we all can learn (if that's okay with the board moderators here).
QTAmateur for MacOS X is available at http://www.mikeash.com/software/qtamateur/ . The developer has a somewhat full explanation of what it does at the site, so I won't repeat it here (and I don't get anything for talking about it here; I just want to share the good news).
Right now I'm field recording with a Flip Mino camera (non-HD), which saves video/audio to an AVI file (3ivx MPEG-4, 640x480) at 30 fps, with 44.1 kHz audio (Microsoft ADPCM). Funny thing is the files from my Flip actually imported into FCE without any conversion, but I had to render everything. And the video looked like crap. Hated the rendering and the look, so I searched for other solutions.
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So I Googled a bunch of keywords, and I somehow stumbled across this QTA package. Snow Leopard users should note a minor drawback here: QTA needs QuickTime 7, which gets blown away in a Snow Leopard upgrade and is not included in new Macs with Snow Leopard. Users can get off of their Install DVD, though, so it's not a huge deal.
When exporting from QTA, I matched its settings (audio and video) with the ones I found in this document: http://discussions.apple.com/thread.jspa?messageID=12274888&#12274888 . QTA's export interface is actually QT7s, so at least that's familiar.
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The only thing I need to figure out is to how to match up some studio-recorded audio with all of the above, so I don't have to render the studio audio and so it comes out at the equivalent of 30 fps. I think all I need to do is record at 44.1 KHz and I'm okay.
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One other quick thing: I'm not sure if this works without that $20 MPEG-2 playback component from Apple (thanks for that charge, Apple!), since I already had the component installed when I discovered QTA. Someone without the component, though, can download this and see if it works. If it does, then we all know that we don't need to spend the extra $20 for it to work.
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@Tom and @Meg:
Thanks so much for your replies (speedy, too!). I especially want to thank Meg, who took the time to replicate the problem (which confirms to myself that I'm not nuts ). At least I know I have an ultimate "savior" in QT7 Pro.
Before I spend that final $30, though, I want to see if Tom can help, based on what the QT Inspector says about my .avi files from the Flip. Here's what it says:
VID00001.AVI
Format: Generic MPEG-4, 640 x 480, Millions
Microsoft ADPCM, Mono, 44.100 kHz
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(that's word for word, except for the source [file location]; wish I could figure out how to paste in the window from my Grab of it.)
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About Elementary, Transport, and Program Streams
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MPEG-1 MUXED - audio playback disappeared

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