Quicklook won't preview my MOV or MP4 files

I've noticed this every since I upgraded to Yosemite. Never seemed to be an issue until now. Is it possible I have a plugin or something that's not supported? There really isn't too much out of the ordinary on my Mac.
When I press the space bar, the box spins for a second and then only an image appears previewing the video. At the top right all it says is "Open in Quicktime."

I have this problem too. I feel like I should post in a plugin forum, but maybe I can test if my problem is your problem.
I installed a qlgenerator that makes non-quicklook formats like flv, mkv, avi, ect. at least show a thumbnail in the quicklook.
I can't remember what it's called, it was something weird.
I'm wondering if that qlgenerator is overriding the system Quicktime .mov qlgenerator, because it shows a thumbnail instead of the movie for certain .MOV files, I think it's the ones with some kind of H.260 something codec that it got when I exported from Quicktime and those ones don't play in Quicklook because of the 3rd party plugin. MOV's downloaded from the internet do however play fine.
I should delete the plugin, but I like the QL thumbnail for odd formats, and frankly I don't remember what it was called.
Also wondering if there is a qlgenerator manager, like with a UI. I've never heard of such a thing, but I find the process of digging deep into the system folder tedious, also Finder GET INFO would be nice if it told a description of all these mystery qlgenerators I've installed over the years.

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Just upgraded to Lion and can no longer import any .mov files ("file not supported") to 3.1.3. Also can no longer view any .mov or .mp4 files already in library.

Have been using Aperture 3.1.3 with no problems. Importing from a Nikon D80 (RAW & JPEG), Casio (.MOV) and Flip (.mp4). Could import and view all videos without issue prior to Lion upgrade. After Lion installation, can no longer import .mov files (get "file not supported" error) or even view any .mov or .mp4 files currently in library (even though thumbnail is present). Can watch the .mov files directly on my camera using Quicktime in Finder but can't even drag & drop that file into Aperture. Anybody else having similar problems?

Still no resolution and Geniuses at store could not assist. Unfortunately, it looks like not all the applications were ready to support the Lion operating system. We could not import any .mov files, could no longer view any .mov files already in my Aperture library and could not email any .mov files. Totally frustrated. Use Aperture almost daily and can't lose the video functionality. Was also running dog-slow. Constantly looking at the spinning wheel. Geniuses suggested that I wipe out hard drive and reinstall Snow Leopard. Had full backup on external drive with Time Machine.
Not an easy process though...had to reinstall several times (at 5 hours each time) because I continued to have issues. Finally figured out that I needed to delete every backup file from Time Machine on external drive from the date I installed Lion because some of the hidden files were still migrating back to Snow Leopard.
I had to:
1. Delete all time machine backup files from date/time of Lion installation forward
2. Do "clean" installation of Snow Leopard (wiped hard drive using disk utility and booted with Snow Leopard disc)
3. Chose option to reinstall from backup off Time Machine which eventually got me back to Snow Leopard desktop
4. Deleted Aperture program and reinstalled (I had to install Aperture 2 and then install Aperture 3 upgrade.
5. Reinstalled iLife apps
5. Applied all Apple updates available (again this took a few hours because there were several updates from Snow Leopard's original release plus Aperture 3 and other application updates)
Still doing some tweaking on some of my other apps but got everything back to where I originally was. Now plan to wait on a few version updates from Lion before reinstalling.
I am one of Apple's biggest fans, but was very disappointed in the fact that I lost functionality in one of their own pieces of software (which I use the most!) by installing Lion.

Why won't preview let me delete all files (instead of all but one)

In all OSX versions up to snow leopard in preview there was the option to select all open items and move the files to the trash. For some reason unknown to me, in 10.8.5 mountain lion that option no longer exists. Now preview lets me delete all files except one. If you have 2 images open you can move 1 to the trash. If you have 99 open you can move 98 to trash and if you have 1 open, you cannot move it to trash. Is there some code available where I can undo this restriction?

Do you also have them on another computer, iPad or iPhone, IF you do then it may be syncing them back

Does anyone know how to move a .mp4 file from flixter into iTunes?

I have downloaded a digital copy of a movie that I received when I purchased a Bluray disc. Most of the time, these go directly into iTunes, but this one went into Flixter. It is an .mp4 file. I tried using Add File to Library, but it didn't work. Any suggestions?
Thanks!

Never mind - got it figured out!!

Does anyone know if MOV or MP4 files from the JVC GY-HM150U will work with the Camera Connection Kit and then be readable by iMovie or similar apps?

The JVC GY-HM150U camera and others in it's line say they offer recording in two different formats:
Native .MOV format
Fastest HD shoot to edit workflow. Edit immediately on Final Cut Pro™ or Premiere™ without conversion or transcoding
Native .MP4(XDCAM-EX™) format
Native File Recording
Because it uses QuickTime™ as its native file format, the GY-HM150U is the perfect choice for users of Apple's Final Cut Pro™ editing system. Both HD and SD MOV files recorded by the camcorder can be dropped directly into Final Cut Pro™, keeping them first-generation and eliminating the time-consuming process of file conversion.For users of all major NLE systems, including solutions from Adobe, Avid, Grass Valley, Vegas and Apple, the GY-HM150U supports the MP4 file format, which can be brought into your editing system without re-encoding.
HD VIDEO RECORDING
Recording media
SDHC (Class 6/10), SDXC Slots: x 2
Video recording
Video codec: MPEG2 Long GOP
QuickTime™ File Format for Final Cut Pro™ (HD/SD)/
MP4 File Format (HD)/AVI type-2 File Format (SD)
Recording mode
HQ mode: VBR, 35 Mbps (Max) MPEG-2 MP@HL
SP mode: CBR, 25 Mbps (1440 x 1080i)/
19 Mbps (1280 x 720p24/25/30): MPEG-2 MP@H-14
19 Mbps (1280 x 720p50/60): MPEG-2 MP@HL
SD Video: DV compression 4:1:1, 8-bit, 25Mbps
Audio: LPCM 2ch, 48 kHz/16bit
Video frame rate
NTSC settings:
HQ mode: 1920 x 1080/59.94i, 29.97p, 23.98p, 1440 x 1080/59.94i,
1280 x 720/59.94p, 29.97p, 23.98p
SP mode: 1440 x 1080/59.94i, 1280 x 720/59.94p, 29.97p, 23.98p
SD mode: 720 x 480/59.94i
PAL settings:
HQ mode: 1920 x 1080/50i, 25p, 1440 x 1080/50i, 1280 x 720/50p, 25p
SP mode: 1440 x 1080/50i, 1280 x 720/50p, 25p
Audio recording
LPCM 2ch, 48kHz/16-bit(Internal stereo mic/External mic input)
and the files recorded to folders labeled "CQAV" (.MOV) or "BPAV" (.MP4), respectively, located in /PRIVATE/JVC/ off the root.
So will the Camera Connection Kit see them properly and transfer them over to Photos, and then will iMovie be able to handle them? Or is the CCK restricted to only formats derived from DSLR cameras with "DCIM" folders, as I have heard?
Any knowledge, especially first hand testing, would be greatly appreciated!
Thanks,
David
Message was edited by: dwoodworth
Changes made to correct the recorded file paths.

Excuse the late post but just wondering if you came up with a solution for this problem? I experienced the exact same issue but copying the movies from Aperture into iTunes (which worked) still didn't allow them to be played on the iPad. As they had played faultlessly when imported directly from the camera connection kit!

Quicklook won't preview certain custom icons

I was rather proud when I found Tranformers png files with transparency (from http://www.michaelbay.com/blog/files/d58812e5a390e8b3a44162285e4ae054-74.html ) and immediately set about changing my Leopard and Vista volume icons. Unfortunately, neither icon will preview in Quicklook or in Finder's Coverflow view. However, they both show as normal icons on my desktop.
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Francine
Francine
Schwieder

Is XMP import/export for MOV/MTS/MP4 files not supported?

I have been evalutating LR4 and am stuck on how to import my files from another DAM into LR4.
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LR4 also does not write out XMP files for the non-image files, when I use save Medatada.
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MTS files can't really accept metadata embedding -your best bet is to use ClipWrap to "re-wrap" AVCHD/MTS files into MOV files.
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Quicktime 10.4 isn't playing videoblock downloaded mov and mp4 files?

I have downloaded some clips from Videoblock.com but Quicktime won't open them. When go to learn more, it says to
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Apple - Support - Downloads Download the version for 10.6.3, or later.
It installs in the Utilities folder and you can use two version of QuickTime Player.

IMovie won't export my movie to desktop file

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Does anyone know how to do this? I have the 4 generation ipod touch.

Welcome to Apple Support Communities
Your Late 2012 iMac doesn't come with a SuperDrive. To install iWork from a DVD, you have two options:
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Premiere Pro CC 2014 8.0.1 won't import MTS, MOV, MP4

My Premiere Pro CC 7.2.2 has no trouble importing AVCHD files (.mts) or .mov or .mp4 files. My Premiere Pro CC (2014) 8.0.1 cannot import these; it sees them as "greyed out". Since, by default, Premiere Pro files open in PP CC 2014, this is a problem. I have to do an "open with" the older version.
Suggestions?
iMac with Mac OS 10.9.4 (Mavericks)

Me too with this one have it randomly when just opening the same project and begining to edit
had it happen about 4 times now.
Latest update
Microsoft Visual C++ Runtime Library
Program C:\Program Fi...
R6025
- pure virtual function call
[ok]
Adobe Premiere Pro CC 2014.1 has stopped working
roblem signature:
Problem Event Name: APPCRASH
Application Name: Adobe Premiere Pro.exe
Application Version: 8.1.0.81
Application Timestamp: 5426694c
Fault Module Name: MSVCR110.dll
Fault Module Version: 11.0.51106.1
Fault Module Timestamp: 5098826e
Exception Code: 40000015
Exception Offset: 00000000000740da
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Locale ID: 2057
Additional Information 1: a22a
Additional Information 2: a22a26525c716a6a7fdf0a84944bf385
Additional Information 3: 9245
Additional Information 4: 9245cf38809b383bd6a86e3f052c9114
Read our privacy statement online:
http://go.microsoft.com/fwlink/?linkid=104288&clcid=0x0409
If the online privacy statement is not available, please read our privacy statement offline:
C:\Windows\system32\en-US\erofflps.txt

CC2014.1 Vers8.1 Caravan crashes every time i try to play or drop a clip on a timeline ( .mov and .mp4 )

I've just moved to CC today, I have used CS5 for the last few years.
After importing my footage and arranging in bins, every time i try t even play a lip or drop one onto a timeline the program crashes.
It won't even play the clip in the small preview window, but it does give me a preview frame.
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Happens on .mov and .mp4 files.
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CC2014.1 Vers8.1 Caravan
Running on laptop today, pc is in for a new SSD. Footage is on a UBB external drive
Windows 7
Intel i7-4700 mq cpu @2.4
8 GB Ram
Programs on SSD Drive C
Cache set to be on Drive E
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Hi Ronan,
Great! it worked.
You can check the link below which highlights the optimization process.
http://blogs.adobe.com/aftereffects/2011/02/optimizing-for-performance-adobe-premiere-pro- and-after-effects.html
Regards,
Vinay

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Splitting or Dividing an MP4 file into Separate Files

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Also when I export as it take way too long.
The "Export" option normally re-compresses the video which is what takes so long.
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Quicklook won't preview my MOV or MP4 files

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