[ffmpegthumbs] [Bug 509991] Dolphin does not load thumbnails in webp format embedded in mkv file

[Michał Walenciak]

https://bugs.kde.org/show_bug.cgi?id=509991

--- Comment #4 from Michał Walenciak <Kicer86 at gmail.com> ---
(In reply to Nicolas Fella from comment #3)
> Thanks. How did you create the file?
> 
> as far as I can tell there is a stream with a webp image inside, but it
> doesn't have the correct content disposition (AV_DISPOSITION_ATTACHED_PIC)
> so the thumbnailer code doesn't use it.
> 
> See
> https://invent.kde.org/multimedia/ffmpegthumbs/-/blob/master/
> ffmpegthumbnailer.cpp?ref_type=heads#L110

these files were created with mkvtoolnix-gui tool, but the original files I
have problems with are being created with yt-dlp (invoked with
--embed-thumbnail option). 
When I use it to download playlist I can clearly see that all movies with webp
thumbnail do not get it in dolphin, while jpeg thumbnails are fine.

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