Thumbnail difference between server v2.0.7 and media-scanner

[dotarmin]

Hi!

When decoding the base64 string generated for thumbnails returned by the media-scanner it looks different compared to the thumbnails generated in Server v2.0.7. See attached images for the difference.

Server v2.0.7 thumbnail

Thumbnail from media-scanner

[jnx]

There seems to be a problem when using thumbnail as a filter in the generation of the thumbnail with FFmpeg.

media-scanner/src/scanner.js

Line 149 in 70d065a

`-vf thumbnail,scale=${config.thumbnails.width}:${config.thumbnails.height}`,

[dotarmin]

How would it be if removing thumbnail filter and using -codec:v png instead and keeping the scaling?

ping @ronag