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CroneKorkN f1fc79269d
fix(nextcloud): enable the concrete image preview providers 
OC\Preview\Image is only the base class, so since 2899cd5 no JPEG or
PNG preview could be generated ("No provider successfully handled the
preview generation").

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01RywMtsL8qXG7GDY3MHq9Uh
2026-10-23 14:11:46 +02:00
..
files nextcloude timer and docs 2026-03-09 12:01:01 +01:00
items.py nextcloude timer and docs 2026-03-09 12:01:01 +01:00
metadata.py fix(nextcloud): enable the concrete image preview providers 2026-10-23 14:11:46 +02:00
README.md nextcloude timer and docs 2026-03-09 12:01:01 +01:00

README.md

Nextcloud

import iphone pictures

Use Photos app on macOS

  • select library in the left sidebar
  • select the pictures
  • in menu bar open File > Export Unmodified Original for X Photos

The only reliable way to get some files creation time is being lost with rsync, so we need to embed those timestamps on macos first:

PHOTOS_PATH="/Users/mwiegand/Desktop/photos"
bin/timestamp_icloud_photos_for_nextcloud -d "$PHOTOS_PATH"
rsync -avh --progress --rsync-path="sudo rsync" "$PHOTOS_PATH/" ckn@10.0.0.2:/var/lib/nextcloud/ckn/files/SofortUpload/AutoSort/

preview generator

sudo -u www-data php /opt/nextcloud/occ preview:generate-all -w "$(nproc)" -n -vvv

This index speeds up preview generator dramatically:

CREATE INDEX CONCURRENTLY oc_filecache_path_hash_idx
ON oc_filecache (path_hash);

delete previews:

psql nextcloud -x -c "DELETE FROM oc_previews;"
rm -rf /var/lib/nextcloud/appdata_oci6dw1woodz/preview/*

https://docs.nextcloud.com/server/stable/admin_manual/configuration_files/previews_configuration.html#maximum-preview-size

    'preview_max_x' => 1920,
    'preview_max_y' => 1920,
    'preview_max_scale_factor' => 4,

https://github.com/nextcloud/previewgenerator?tab=readme-ov-file#i-dont-want-to-generate-all-the-preview-sizes

sudo -u www-data php /opt/nextcloud/occ config:app:set --value="64 256" previewgenerator squareSizes
sudo -u www-data php /opt/nextcloud/occ config:app:set --value="" previewgenerator fillWidthHeightSizes # changed
sudo -u www-data php /opt/nextcloud/occ config:app:set --value="" previewgenerator widthSizes
sudo -u www-data php /opt/nextcloud/occ config:app:set --value="" previewgenerator heightSizes
sudo -u www-data php /opt/nextcloud/occ config:app:set preview jpeg_quality --value="75"
sudo -u www-data php /opt/nextcloud/occ config:app:set --value=0 --type=integer previewgenerator job_max_previews # in favour of systemd timer

gen previews

php /opt/nextcloud/occ preview:generate-all --workers="$(nproc)" --no-interaction -vvv

check preview geenration

find /var/lib/nextcloud/appdata_oci6dw1woodz/preview
# /var/lib/nextcloud/appdata_oci6dw1woodz/preview/6/9/1/f/7/b/4/2822419/64-64-crop.jpg
# /var/lib/nextcloud/appdata_oci6dw1woodz/preview/6/9/1/f/7/b/4/2822419/256-256-crop.jpg
# /var/lib/nextcloud/appdata_oci6dw1woodz/preview/6/9/1/f/7/b/4/2822419/1280-1920-max.jpg

du -sh /var/lib/nextcloud/appdata_oci6dw1woodz/preview
# 28G	/var/lib/nextcloud/appdata_oci6dw1woodz/preview