Optimizing preview generation results in NO previews at all for many files

[j-ed]

@e-raser

for few of them there are log entries, usually saying “too large”

This might be related to the 'preview_max_filesize_image' => 50, parameter which skips the preview generation for all image files greater than the given size.

@e-raser

Affected files:

• what I see after manually checking hundreds of them: … (few HEIC).

previews for HEIC files are on generated if the underlying imagick program supports the format. See the following posting for further details:

HEIC/MOV previews

Nextcloud relies on the imagick program command line program to convert images. If this program supports the HEIC format, Nextcloud should also be able to create the preview files. See how it could be enabled: Afaik, the following command can be used to check if the HEIC format is supported: # php -r 'phpinfo();' | grep HEIC The imagick support can be checked by executing this command: convert --version