1.5.5: Thumbnail-view IGNORES embedded image in VIDEOs; and always use your auto-generated thumbnail from the video file

[kbyork]

XnView: MP 1.5.5 64-bit
OS: Windows-10 Pro 64bit


Effect:
Thumbnail-view IGNORES the embedded image in any VIDEO files; and always uses your auto-generated thumbnail from the video itself.

To reproduce:
1. take a video that has an embedded thumbnail image; and a video that does NOT...
2. in XnView-MP, go to thumbnail view
3. in Windows Explorer, go to thumbnail view
4. (compare them)

Actual behavior (bug): in XnView-MP, you see the auto-generated thumbnail for both.
in Windows Explorer, you see auto-generated thumbnail for one; and the embedded image for the other.

Expected behavior: should look similar to Window Explorer's thumbnail view.

How do I send you sample files???
(these are very-small video files; but still too big to attach here)

[user0]

How do I send you sample files???
(these are very-small video files; but still too big to attach here)

upload somewhere, eg to mega.nz

[kbyork]

...ok... here are my sample videos:
Big Buck Bunny IMDb (and cover-art): https://mega.nz/file/qzYTUagB#-J_a1zQxz ... Fo0Yei7254
Big Buck Bunny IMDb: https://mega.nz/file/OuphBTSL#3G9iPd8oA ... Qe94LaU_Cw

[xnview]

embedded image is not used for video file

[kbyork]

hmmm... what is?

embedded image is what I found in a EXIFtool forum (and obviously) Microsoft uses it.

But I'm happy to be corrected.
I just need to know what I should be using. (and suggestions on how to add it would be great if possible)
(any help here would be appreciated)

[user0]

as for me its not not a big deal, but it would be nice to have cover images support, like in MS Photos, FastStone