Quick Look for .flv in Mavericks?

I've experienced the same problem --- flv and avi files no longer work in Quick View. Although they can still be viewed in VLC or Quicktime 7, they can no loner be browsed from the Finder. What a pain!

Even if this represents cleaner code or a more modern architecture for Apple, it means a significant loss of functionality and flexibility for Apple's customers. I hope Apple will do something about it.

There other threads about similar issues. For instance this one: https://discussions.apple.com/thread/5470956?answerId=23586139022#23586139022&ac_cid=tw123456#23586139

I would recommend to write Apple at http://www.apple.com/feedback/ and report a bug with QuickTime and quicklook

JWKessler wrote:

Same for .mp4. Perian is no longer functional in Mavericks. Apparently Apple made some rather major change that broke it and makes it unlikely that the problem will be fixed. If I had know about this before upgrading I would have stayed with Mountain Lion.

Perian works just fine for playing these files in QuickTime Pro. What it doesn't do (and never did do) is generate QuickLook previews in the Finder for .flv files. That behavior is regulated by a plugin, a QuickLook plugin which no longer functions in 10.9 Mavericks. Even after reinstalling the qlflv generator plugin and killing the Finder, it still doesn't work.

Apple effed up big time with their QuickLook debacle!

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.

Feedback

Perian unluckly stopped already a couple of year ago; but it still works for me on OSX 10.9

I installed perian (the last old release 1.2.3) after I've set up manly the system.

A couple of day ago, after I did the upgrade quicktime was unable to read .mov file that was a conversion of a flv made on OSX 10.6.8, but now it's fine. However at first launch Gatekeeper ask to be claer it, also now take a while to "convert" flv and mov/mp4 converted.

Mean while I had problem with flip4mac.

I am using the free GPL "Video Container Switcher". It does not convert the codecs but it puts them in NO TIME (one second or so) into a container format that AVKit framework (the new Quick Time player in Mavericks) understands. It works just fine for many video files as they do have a codec inside that AVKit framework understands. For instance, many flv-files are h.264 encoded. They are just in the wrong "container". The software "converts" them to MOV and Quicklook is back. To my big surprise it also switched DivX-Files to MOV (not mp4 - no sound in this case - don't ask me why, perhaps as DivX uses MP3 sound and mp4 might accept aac only). Thinking about it it makes sense as DivX is nothing than h.263 - a codec that AVKit framework understands :-). It does not work for WMV though. Most important thing is that there is no loss in quality as Video Container Switcher does not re-encode. Apart from having Qucklook back there is another advantage: files can viewed on all mobile apple devices and on Apple TV :-).

This works for me under 10.9.5

https://github.com/Marginal/QLVideo