[Feature Request] Thumbnail conversion

[Maxplosion]

Checklist

• I'm asking a question
• I've looked through the README and FAQ for similar questions
• I've searched the bugtracker for similar questions including closed ones

Question

Hi,
I've checked closed and open issues and the readme but I could not find information regarding the conversion of thumbnail images, I know if i "embed" the image a conversion from *.webp to *.jpg is forced, but is this also possible for regular downloads of the thumbnail image via "--write-thumbnail" ?
Reason: I would prefer not to use *.webp and instead have *.jpg for all thumbnails.
Thanks!

[pukkandan]

Not currently possible. I am converting this to a feature request

[TheFrenchGhosty]

@pukkandan FYI, YouTube serve both webp and jpg (at least on the community tab). We had to enforce jpg in Invidious for compatibility reason with older browsers.

See: iv-org/invidious#659

[pukkandan]

There is currently no option for thumbnail selection like what we have for subtitles. I have been thinking of implementing one

[jathek]

@pukkandan FYI, YouTube serve both webp and jpg (at least on the community tab). We had to enforce jpg in Invidious for compatibility reason with older browsers.

See: iv-org/invidious#659

If I understand this correctly and it's possible to pull the original jpg directly from YouTube instead of a webp, I hope yt-dlp supports that instead of just a conversion of webp after the fact.