Windows Explorer Doesn't Display Certain AVI & FLV Thumbnails

posted in Video Codecs

I’m using 32-bit Windows 7. My Windows Explorer can display thumbnails perfectly fine, EXCEPT for a few files. Some FLVs and AVIs have thumbnails, while some others don’t.

It’s not an issue of a slow CPU or bloated RAM, cause I’ve waited and waited, but some thumbnails are still missing. It’s not an issue of missing codecs, either, cause they can be played fine (I’m 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 don’t. All were downloaded from YouTube or Vimeo via or 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) didn’t.

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? I’m stumped.

I found another post with the same problem as me on Seven Forums, but nobody replied with any solutions to that: reply

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