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

https://bugs.kde.org/show_bug.cgi?id=3D509991

--- Comment #4 from Micha=C5=82 Walenciak <[email protected]> ---
(In reply to Nicolas Fella from comment #3)
> Thanks. How did you create the file?
>=20
> 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.
>=20
> See
> https://invent.kde.org/multimedia/ffmpegthumbs/-/blob/master/
> ffmpegthumbnailer.cpp?ref_type=3Dheads#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).=20
When I use it to download playlist I can clearly see that all movies with w=
ebp
thumbnail do not get it in dolphin, while jpeg thumbnails are fine.

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