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Since upgrading to Mavericks, many movie or video types no longer are available through Quick Look - and must be converted to play through Quicktime. The convertion can take a awfully long time, depending on the movie size.
Why is that - because they worked fine with Mountain Lion.
The most noticeable examples are .MP4's
I'm having a similar issue .MP4's work fine in Quick Look but .mov with Apple intermediate codec do not, nor do .flv's.
Same here. For me, MP4 files do not play in QuickTime or with Quick Look. QuickTime says it may be damaged or may be a file that is not compatible with QuickTime. However, the files play fine in VLC, and they used to play in QT (or with Quick Look) when I was using Snow Leopard.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
I'm able to view .mp4 videos with Quicklook on my iMac with Mavericks.
I was having the same problem and uninstalled the perian codec pack (it was not updated for mavericks or for quite some time ) This solved the problem and didn't need a restart or anything. Just quit quicktime.
I just realized that I had removed Perian also but forgot I had. Good catch.
alexstevenw i tried uninstalling perian but no dice, even restarted for safe measure, didn't work either. Maybe this will help someone else..
I too thought Perian might have something to do with it. I removed it - to no avail. Same issue. I have 4 fairly newer iMac 27s - and do a lot of video editing. I tried the same files on all 4 boxes - and they wouldn't quick look - and required converting to open in Quicktime.
They play fine in VLC - but I had to loose the quick look ability. I didn't realize how much I relied on that when sorting through clips.
I know it is a codec issue - and hopefully there is an easy fix. I can't believe they would limit what video types play back on a newer operating system. I have read that several other video types are likewise unplayable without a conversion.
After a little more use I find it still tries to convert some mp4 and all avi files on the go. So not a full solution but it did help a large majority of my files.
Hmmm strange goings ons here!
I still have not deleted Perian but I can view all my mp4, mp3 and m4a files in Quick View but am not able to view 'flv' files. I updated to Mavericks today from Snow Leopard 10.6.8.
I tried deleting Perian and also restarting, but it didn't make a difference. QuickTime (and Quick Look) still won't read the MP4 videos taken with my smartphone. They use the H.264 codec, and I have other H.264 MP4 videos that will play, but those won't. They played fine in Snow Leopard.
I had the same problem, then I installed Apple's ProApps Quicktime Codecs and that solved the problem. The
update adds the following video codecs for use by QuickTime-based applications:
You'll find the download on the Apple Support website: http://support.apple.com/kb/DL1396
Thanks for the suggestion. I tried installing it, but I couldn't because I don't have Final Cut or the other two applications required for installing that package.
I should add that in my case, QT won't open the MP4 files at all -- it's not a matter of conversion.
I tried the ProApps Quicktime Codec update - to no avail.
I still have a large volume of .mp4 files that won't open in quick look - and require a lengthy conversion to open in Quicktime.
VLC will open the open the files.
This is kind of a big deal for me - because I use my computers for extensive video editing - and this is hurting my workflow.
I am hopeful this will be patched soon.
Why No Quick Look with MP4 in Mavericks?
