Yep, me too....same prob. Noticed it first when I was doing a quick preview of my iMovie Events .mov files. No longer able to view them without "converting". This is a large Library on an external Drive...which brings me to another problem with Mavericks and iMovie. No longer supports external drives (ie. NAS). So, that's two major Video related issues.......hoping Apple can resolve them quickly in the next update.
I have this same issue. Now I have switched to using MplayerX which you can get on the App Store. It plays everything, uses a lot less energy than Quicktime (as per Mavericks own activity monitor) and if you are watching a video, but close the app, it will re-open the video where it left off when you open the app again. It's so much better than Quicktime and looks nicer than VLC with no borders on the video.
I hope this helps.
I also experience cracking in my audio when I was mp4 videos in QuicktimeX
not very impressed with the way apple has been pushing updates.
10.8.5 broke sleep mode and need supplemental updates
Mavericks has hiccups with Maps and some gfx artifacts until I killall Dock
quicktime audio crackles with my exernal soundcard but not the internal one.
I just had a chat with the support team about this issue. They said they would inform the engineers. However, they advised me nonetheless to provide feedback to apple through this link: http://www.apple.com/feedback/
It is a major and surprising issue, I hope they solve it soon. The more people write them about it, the better.
I'm having another problem on my late 2013 macbook air 13 inch core i7 ; when I play videos in full screen (ie Jony Ive iPad Air Promo) the black bar at the top moves up and down and the color flickers slightly. I reinstalled OSX 10.8.5 and it didn't do this. Can anyone else confirm this? It only does this on my MBA, my 2009 iMac doesn't have this problem.
Stuttering sound and re-conversion is the system trying to make heads or tails of formats it has no codecs for. Most of what we use now is NOT of Apple's creation other than the .mov format, and that is a container for the audio and video!
You need to rebuld the libraries of codecs and DO NOT USE QuickTime Player X! Apple is going all gung-ho with security since the migration to the 'cloud' and computers are expected (eventually) to be online all the time. It's security, security, security, and since the QT technology IS a Core Component, it's becoming all firewalled (hence a lot of video formats not working on the QuickLook)
Stick to QT 7.6.6, it will run and accept all the codecs since it is not the 'officially' nested QuickTime player anymore.
Here is a list I'm putting up all over, since I've gotten my install of Mavericks to run flawlessly with all of my video.
Start with QT 7.6.6. - http://support.apple.com/kb/DL923
Get Perian, and install it. - http://perian.org
then VLC, - http://videolan.org
DivX - http://divx.com - and the
Flip4Mac package from Telestream - http://www.telestream.net/flip4mac/
This is what I've put into my system and so far I've gotten every file to run just ducky, even my oldest videos.
ApleIntermediateCodec.component (should already be there)
AppleMPEG2Codec.component (optional if you paid for it)
Flip4Mac WMV Advanced.component
Flip4Mac WMV Export.component
Flip4Mac WMV Import.component
In your Home/Library/QuickTime/
For AC3 sound that is in most .mkv files, you need the A52Codec.component, here:https://dl.dropboxusercontent.com/u/34821905/A52Codec.component.zip - unzip the file and put the component into the System/Library/Audio/Plug-ins/Components..
Go back to your Perian settings and in the Audio Output button, set it to 'Multi Channel Sound' - Ignore the message Perian puts up and select it.
By doing a 'Get Info' on your files and where it says 'Open With', default them to the QuickTime 7 and set it so it is the default for all the files of whichever type you use. It should work perfectly. So far I've gotten ALL my old videos to play and not a one has wanted to reconvert, even my older .mov files.
Dave, that doesn't matter. The codec pack STILL works.
Don't let the issue of 'not supported' stop you from using it. All that it means is that it will not be updated anymore.
If at some distant point in the future the codecs in Perian no longer work due to either a change with QuickTime or the formats themselves, there is always MplayerX or VLC.
For the time being though, Perian is still valid for making file formats work inside of QuickTime Player 7 (and if you've a bit of $$ to throw down, you can buy the Pro key for it and unlock the full ability of the program to convert or encode to all the audio/video formats it offers.)
Ninja Edit: Ah, okay, yeah, it's all there! LOL!
Honestly, I'm not certain just where that AC3MovieImport component comes from.
I'm going on the exact list of what I found in my Snow Leopard volume (I have four on my laptop, 10.6.8 - my main volume, 10.8.5 and 10.9 over what used to be my 10.5.8 volume and a storage drive) and used all the installers in Mavericks to get it to match.
I suppose I could have just copied the .component files over to their identical folders in 10.9, but with a new OS, AND since I was coming from 10.6, you never know what has changed or if there are newer installation instructions.
So far, so good and no issues at all.
OK I see the work around above, but it' still a fundamental disappointment. Why should consumers with video collections be presented with a new operating system and default system video player that cannot play most of their files and be forced to revert back to an older version just to play files?
I play my movies and music videos from within iTunes and iTunes selects the player and now plays back with crackly sound, will this workaround fix that?
Are you suggesting that Apple will never fix QuickTime X to allow correct playback?