Can't have webp and video previews working at the same time

I wanted to enable video thumbnails so I installed ffmpeg in my container image using a Dockerfile and added this to my config.php:

'enable_previews' => true, 
'enabledPreviewProviders' => 
array (

This works both in docker version (if you install ffmpeg) and on regular installs BUT the moment you add this block of code to your config webp previews stop working! I have added ‘OC\Preview\WEBP’ to the array to see if works but it doesn’t. If I remove this block of code from the config file webp previews start working again but video previews do not. Anyone knows how can I have both webp and video previews working at the same time?

Hi, if you do in bash command “file X.webp” you see like:

file X.webp
X.webp: RIFF (little-endian) data, Web/P image, VP8 encoding, 1280x1820, Scaling: [none]x[none], YUV color, decoders should clamp

as see, in my case it’s RIFF file format, then add ‘OC\Preview\RIFF’ and genereate preview start working