Quicktime on Mavericks outputs stuttering audio.

Just a stupid QuickTime bug.

I can create an AIFF with Logic X (64 bit) in 10.9 and the file will stutter when played back with QuickTime. ANYTHING else will play the file back just fine.

REALLY LAME QUICKTIME BUG!

Yup. I also noticed that playing back anything on Soundcloud has the same problem. I use SC a lot so this is incredibly annoying, it's totally unusable now. I guess QTX is being used for playback? Anybody else has the same issue?

Hi there!!!

Exactly the same problem with Quicktime X and Safari mostly.. I'm a musician / studio owner... and I work all the time with audio streaming services such as Sound Cloud, Now with Mavericks I get crackles all over the place... but sporadically... which is worse because you never know when o why it happens!

I'm Using right now a MOTU 896mkIII Hybrid via Firewire 800 but seems a global Firewire Audio Devices Issue.. Which are still a standard all over the world.

My temporary solution is to disable Power Nap when and wherever possible... Use VLC player... which apparently works without drops or crackles... and now i'm going to try Google Chrome and hope I can listen music and watch videos without the pop corn FXs included in audio.

Please Apple... we really LOVE YOU!!! --- Fix this -- i mean, it used to work perfectly even with G4 machines! 10 years ago!! ---

Same problem with MacPro 2013 and FA66 in Firewire/ thunderbolt adaptor.

Resolve when I put the card in 96khz.

But this is not a solution, like Michael said...

I had this exact problem immediately on upgrading to OS X Mavericks.

What solved it for me was to change the default player from "QuickTime" to "QuickTime 7".

Select a video / movie and right click, choose "Get Info." from shortcut menu.

In the resulting window click on the "Open With" arrow and choose "QuickTime Player 7.app" and then choose "Change All".

This will now make QuickTime 7 the default app for all files with that particular file extension, example .mov or .mp4 etc.

You will need to do this for of each type of file extension.

This solved the stuttering noise instantly, hope this helps.

It seems to have been fixed with OSX Yosemite. I can finally use my FA-66 again and get clean audio from Quicktime and iTunes.

Yup ! First thing i did after installing Yosemite was to test this, and it looks like it has been addressed !

Tested vimeo videos on safari (which was using the faulty Quicktime plug-in) and quicktime videos.

I'm using an UAD apollo W/thunderbolt on a mac book pro…

Finally ! (one year of struggle and workarounds!)

I have the same stutters since update Lion to Mavericks in June'14.

I had stutters in Quicktime, Soundcloud, Vk.com

I'm using Macbook Pro Late 2012 with Mavericks and external Tc Electronics Konnekt 24D sound card (FireWire)

How I fix the problem: Open System Preferences, open Sound -> go to input and chose your external card with a mouse click.

Now you can swap this window in a dock and have no audio stutters.

So, will this problem be completely solved after upgrade to Yosemite?

Thought I'd chime in.. Using a class-compliant Firewire interface, for which there is no "driver", with 10.9.5 here. Same behaviour of all mentioned apps though I didn't see anywhere mentioned that it only happens when the system is not resampling audio i.e. when the file being played is the same sample rate as the device sample rate. In my case this is 48kHz (as a sound professional I like having one sample rate across everything). This is why choosing 88 and 96kHz sample rates works - the system is almost always forced into sample rate conversion. I am investigating further but it does seem related to power-management and device assumptions. Those of us with older devices seem to be *d at the moment.

edit: just to confirm disabling app-nap globally or on a per-app basis has no effect on this in 10.9.5