Thumbnails for video files are not showing in Windows 7

When I open my video folder, the thumbnails aren't showing. Instead, the default VLC icon was being displayed. Other files and image thumbnails are being displayed properly, only the videos have problems.

The "always show icons, never thumbnails" option is unchecked.

What could be the problem?

I have also installed the K-lite codec pack, I tried clearing the thumbnail cache, but it's not working.

My problem is similar to this, but with videos: Windows 7: Image thumbnails fail to appear

I had the same problem. Just found this link about Media Preview, installed it and worked perfectly. My thumbnails are back:

http://www.snapfiles.com/get/mediapreview.html

Media Preview enables Windows Explorer to display video thumbnails for just about any video format out there. If you are seeing blank or generic thumbnails for some of your video files, just install Media Preview and select the formats you want activate. The next time you open your video folder, it will display thumbnails for all your movies.

I managed to fix this. The problem was that my registry entry was modified incorrectly by some software.

The HKEY_CLASSES_ROOT\.mp4\ShellEx entries were modified. I changed them to this:

[HKEY_CLASSES_ROOT\.mp4\ShellEx]


[HKEY_CLASSES_ROOT\.mp4\ShellEx\{BB2E617C-0920-11D1-9A0B-00C04FC2D6C1}]
@="{c5a40261-cd64-4ccf-84cb-c394da41d590}"


[HKEY_CLASSES_ROOT\.mp4\ShellEx\{e357fccd-a995-4576-b01f-234630154e96}]
@="{9DBD2C50-62AD-11D0-B806-00C04FD706EC}"

merged it and restarted my PC.

I fixed this changing the settings of K-lite codec pack:

1. From start menu choose All Programs.
2. Click K-lite Codec Pack folder.
3. Click Codec Tweak Tools folder.
4. Open All options.
5. Click Thumbnail Settings.
6. Select the file types for which you would like to display thumbnails or click Select Windows default.
7. Click Apply & Close.
8. Restart the computer for this changes to take effect.

I had the same problem until I tried to change the settings of K-lite codec pack and succeeded at getting most of video formats to display the thumbnail preview. I hope it works with you too.

1. Open the K-lite codec pack's options from view tab.
2. From the left choose "Formats".
3. Click on "Modify".
4. Under "Association" uncheck "with icon". Apply and it should take effect immediately.