Quicktime on Mavericks outputs stuttering audio.

VLC is a free "media" player. It should work fine for music playback.

VideoLAN - Download official VLC media player for Mac OS X

Quicktime 7 will also work fine. Just not Quicktime X. My problem is most of our video is shot in AVCHD. Quicktime X supports it but not Quicktime 7. Final Cut Pro X is also dependent on Quicktime X.

The silence from Apple and audio manufactureres on this problem is deafening! They should be ashamed.

I can see by your comments that this problem has not been resolved yet, i was going to ask for a fix but i see thereis none so far.

That is unreal and shameful !!

I will continue to use MPlayer X for AVCHD FILES IN MTS and QT 7 FOR ALL THE OTHERS.

I wonder if this will come up with Beta Testers in the new version of Maverick,

it really should I think it is overdue.

Thanks,

Apple Lou

Universal Audio is very vocal about it if you write their support. That say they are aware and are working on a fix.

This is NOT an Apple problem. This is a problem with device manufacturers not updating their drivers for Mavericks. Focusrite fixed their drivers a while back. Their response about this problem is on page 14 of this discussion:-

"Apple made changes to power management in Mavericks to reduce power consumption. One of these changes was increasing the buffer size when latency isn't critical (e.g. QuickTime). To accommodate this larger buffer size, small changes to the driver were required to allocate more memory. This has now been resolved in our latest release and it is something that we will test for in future releases.

Best regards,

Neil Marron

Focusrite"

CowboyBob500 wrote:

This is NOT an Apple problem. This is a problem with device manufacturers not updating their drivers for Mavericks. Focusrite fixed their drivers a while back. Their response about this problem is on page 14 of this discussion:-

Then what about all those "class compliant" devices which don't come with specific drivers but rely on the generic drivers built into OSX? Wouldn't it be Apple's responsibility to take care of these?

cronbg wrote:

CowboyBob500 wrote:

This is NOT an Apple problem. This is a problem with device manufacturers not updating their drivers for Mavericks. Focusrite fixed their drivers a while back. Their response about this problem is on page 14 of this discussion:-

Then what about all those "class compliant" devices which don't come with specific drivers but rely on the generic drivers built into OSX? Wouldn't it be Apple's responsibility to take care of these?

Not necessarily. It could be that the firmware on the device itself expects a certain buffer size, and now that's changed the device no longer works correctly.

Technical note TN2274 in Apple's dev library on USB class compliant audio only mentions that the built in driver is responsible for passing any buffered data to and from the host to the device. It doesn't mention size limits or buffer managerment at all. Therefore, as a developer I would expect to have to deal with the increased default buffer size either in firmware or in a custom driver.

In fact it actually states further down in the section on bandwidth calculation - "Warning: Failure to comply with the bandwidth rules for the current sample rate and format may not only result in audio corruption for that particular stream, but for all of the other streams on the same engine."

Message was edited by: CowboyBob500

Not necessarily. It could be that the firmware on the device itself expects a certain buffer size, and now that's changed the device no longer works correctly.

In that case, the problems would not be limited to Quicktime.

In case of my Edirol FA-66 I don't have any issues running e.g. Logic or Mainstage.

Only Quicktime (and iTunes, which is AFAIK built on top of Quicktime) are affected. What's more:I can watch movies just fine in iTunes as long as they are running in a small window. Only when I switch to full screen the audio becomes glitchy.

cronbg wrote:

Not necessarily. It could be that the firmware on the device itself expects a certain buffer size, and now that's changed the device no longer works correctly.

In that case, the problems would not be limited to Quicktime.

In case of my Edirol FA-66 I don't have any issues running e.g. Logic or Mainstage.

Only Quicktime (and iTunes, which is AFAIK built on top of Quicktime) are affected. What's more:I can watch movies just fine in iTunes as long as they are running in a small window. Only when I switch to full screen the audio becomes glitchy.

Not necessarily true. As the guy from Focusrite said, this is a forced buffer size when running apps that don't require low-latency - a buffer size that is larger than in previous versions of OSX and which the operating system sets as it sees fit. Both Logic and Mainstage are low-latency applications where you can set your own buffer size. I'm suspecting that this forced buffer size is just larger than the device is capable of dealing with (either in its firmware in the class-compliant case, or in its drivers in other cases) - at least this was the case with Focusrite as far as I can tell.

Assuming you are correct, then iTunes would use different buffer sizes depending on whether it is running in full screen mode or not.

In that case I'd still argue that the responsibility for fixing this would lie with Apple.

Neil, Thank you for stepping in on this converstaion and giving a manufacturers perspective.

I've gotten no where with Apogee.

Why would these weird "fixes" then work? i.e. Running Garageband in the background? Or Apogees suggestion to set the interface at 96k?

I've used Apogee devices for years (I own 4 of them) and love the sound of their converters but after this endless nightmare they won't get my business again. I have work that needs to get done and this audio problem with professional devices in professional software is inexcusable.

Latest answer from Universal Audio's support about the issue:

"Thank you for the update and sorry to hear about the problems you're experiencing.

We are aware of a bug which we are currently working with Apple in resolving. At this time we recommend downgrading your Quicktime X to Quicktime 7 which appears to address the issue in most cases. Otherwise, we are working quickly to ultimately resolve the issue without having to conduct a work around.

Thank you for your patience during this development."

Many thanks to Universal Audio and Focusrite.

APOGEE WHERE ARE YOU????????

Why so silent!

What about the problems regarding video playback? They don't seem to be the developers' responsibility. QTX will simply not play now most of codecs unless previously converted. Huge step back for editors. Will there be a fix?

Bump. Any news on this?

My problems have not changed. Basically running Garageband in the background is the only way that i get clean audio in Final Cut Pro X (most of the time.) Pretty pathetic Apple / Apogee for "Professional" systems.