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Windows 7: Windows Explorer Doesn't Display Certain AVI & FLV Thumbnails

23 Oct 2011   #1

Windows 7 Starter 32-bit
Windows Explorer Doesn't Display Certain AVI & FLV Thumbnails

Iím using Windows 7 Starter 32-bit. My Windows Explorer can display thumbnails perfectly fine, EXCEPT for a few files. Some FLVs and AVIs have thumbnails, while some others donít.

Itís not an issue of a slow CPU or bloated RAM, cause Iíve waited and waited, but some thumbnails are still missing. I don't think it's an issue of missing codecs, either, cause they can be played fine (Iím using K-Lite Mega 7.8.0 - 4th October 2011). So I decided to check these oddballs using MediaInfo, one by one.

For FLVs, all of my files come in two formats:

1) Format: AVC, Codec ID: 7
2) Format: Sorenson Spark, Codec ID: 2

Some have thumbnails, some donít. All were downloaded from YouTube via The only pattern I see is that all videos from before January 2009 had thumbnails, while almost all videos downloaded from then till the present (October 2011) didnít.

As for AVIs, the problematic ones are:

1) Format: MPEG-4 Visual, Codec ID: XVid
2) Format AVC, Codec ID: AVC1

Again, it seems random. There are other AVIs encoded with AVC1 which had thumbnails. So... What might be the solution for this? Iím stumped.

I found another post with the same problem as me, but nobody replied to that:

My System SpecsSystem Spec

23 Oct 2011   #2

Windows 7 32 bit

You could try this:
Codec Tweak Tool 5.0.9 - Downloads

But before running anything that changes the Registry I recommend making a restore point or backing up your Registry with ERUNT
My System SpecsSystem Spec
24 Oct 2011   #3

Windows 7 Starter 32-bit
Nothing Happens

K-Lite comes with the Codec Tweak Tool. Anyway, I ran it. There was nothing to fix.
My System SpecsSystem Spec

24 Oct 2011   #4

Windows 7 Ultimate 64bit

Uninstall Klite, install the Shark007 Win7codecs

After installation, open the settings application using a rightclick on the shortcut and choose Run as Administrator
If UAC is disabled, use the [Reset All] button on 1st use. This is automatically ran if UAC is enabled.
On the Help TAB, use the button to associate filetypes to the Windows players

All files will be thumbnailed with colourful thumbs (not just black) and play properly too.
The Windows explorer Preview Pane will be enabled for use by all filetypes.
If you do have any problems with playback, try the [x] SUGGESTED settings checkbox.
My System SpecsSystem Spec
25 Oct 2011   #5

Windows 7 Starter 32-bit

Hahah! After all the hassle of uninstalling K-Lite and then installing Shark007 (and of course, following your instructions above), the FLV thumbnails are still not generating.

But the good news is that I somehow felt like renaming the file extensions of the AVIs (since they were in a folder with MP4 files downloaded from YouTube, I tried renaming them to either .FLV/.MP4), and it worked! =D So it was just a case of wrong containers, I guess.

I also renamed a few Sorenson Spark FLVs into MP4, and the thumbnails appeared. Now, the only thing left is the AVC7 FLVs. Renaming them to MP4 doesn't do anything. What else can I do?
My System SpecsSystem Spec
25 Oct 2011   #6

Windows 7 Ultimate 64bit

I would venture to guess that they do not have correct extensions (flv). Use the button on the Misc TAB to analyze a media file - that will help you decide what he extension should be. If you're unfamiliar with the contents of the analyzation report, post the information from the tool here and i can tell you what extension the file should have.
My System SpecsSystem Spec

 Windows Explorer Doesn't Display Certain AVI & FLV Thumbnails

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