Catalog and or Metadata Updates take a lot longer when done through the WebUI – therefore it might be easier to update an Ampache Catalog through the commandline interface.
cd into the directory where Ampache is installed
execute the following command
php -d memory_limit=1G bin/catalog_update.inc
this command will update all catalogs
Commands can be joined into a single argument. This example will clean deleted files, add new ones and gather the art for these new files on a single catalog called music.
php -d memory_limit=1G -f bin/catalog_update.inc -- -n music -cag