nextcloud / nextcloud/previewgenerator
Error on preview generator of metadata/cache OS files.
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- Dominant language
- PHP
- Stars
- 520
- Forks
- 55
- PR merge metrics
- No merged PRs in 30d
Description
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I ask for apologies if this is already sorted in some how and I didn't find my answer after a period of searching about it. Also sorry if I have redacted more as needed. Please advise if further data is required.
Steps to reproduce
- php occ preview:generate-all
- Go to admin > Registers (Logs)
- Reports of errors is shown: "Movie preview generation process failed, file=/[user_redacted]/files/Photos/[path_redacted]/._M00300.m4v"
Expected behaviour
Skip metadata files (or even hidden dot files)
Actual behaviour
previewgenerator tries to make a preview of a file just based on extensión and without possibility to skip some possible patterns related with metadata files as Apple Double "._XXXXX.m4v" files. This is filling my nexcloud server logs.
Short-term solution will be talk with owners, as it is a small home nextcloud server, to proceed to its removal.
Server configuration
Web server: Apache/Nginx
Database: PostgreSQL
PHP version: 8.4
**Nextcloud version:**34.0.0
List of activated apps
``` Enabled: - activity: 7.0.0 - app_api: 34.0.0 - appstore: 1.0.0 - bruteforcesettings: 7.0.0 - circles: 34.0.0 - cloud_federation_api: 1.18.0 - comments: 1.24.0 - contactsinteraction: 1.15.0 - dashboard: 7.14.0 - dav: 1.39.0 - drawio: 4.2.5 - federatedfilesharing: 1.24.0 - federation: 1.24.0 - files: 2.6.0 - files_downloadlimit: 5.2.0-dev.0 - files_lock: 34.0.0 - files_pdfviewer: 7.0.0-dev.0 - files_reminders: 1.7.0 - files_sharing: 1.26.0 - files_trashbin: 1.24.0 - files_versions: 1.27.0 - firstrunwizard: 7.0.0-dev.0 - guests: 4.8.0 - logreader: 7.0.0 - lookup_server_connector: 1.22.0 - maps: 1.7.1 - memories: 8.1.0 - nextcloud_announcements: 6.0.0 - notifications: 7.0.0-dev.1 - oauth2: 1.22.0 - office: 1.0.0 - password_policy: 6.0.0-dev.0 - photos: 7.0.0 - previewgenerator: 5.14.0 - privacy: 6.0.0-dev.1 - profile: 1.3.0 - provisioning_api: 1.24.0 - recommendations: 7.0.0-dev.0 - related_resources: 5.0.0-dev.0 - serverinfo: 6.0.0 - settings: 1.17.0 - sharebymail: 1.24.0 - support: 6.0.0 - survey_client: 6.0.0-dev.0 - systemtags: 1.24.0 - text: 8.0.0 - theming: 2.9.0 - twofactor_backupcodes: 1.23.0 - twofactor_totp: 16.0.0 - twofactor_webauthn: 2.7.0 - updatenotification: 1.24.0 - user_status: 1.14.0 - viewer: 7.0.0-dev.0 - weather_status: 1.14.0 - webhook_listeners: 1.6.0 - workflowengine: 2.16.0 Disabled: - admin_audit: 1.24.0 - encryption: 2.22.0 - files_external: 1.26.0 - suspicious_login: 12.0.0-dev.0 - twofactor_nextcloud_notification: 8.0.0 - user_ldap: 1.25.0 - user_migration: 10.4.0 (installed 10.4.0) ```Nextcloud configuration
{
"system": {
[redacted_for_privacy_and_security]
"installed": true,
"maintenance": false,
"forbidden_filename_basenames": [
"con",
"prn",
"aux",
"nul",
"com0",
"com1",
"com2",
"com3",
"com4",
"com5",
"com6",
"com7",
"com8",
"com9",
"com\u00b9",
"com\u00b2",
"com\u00b3",
"lpt0",
"lpt1",
"lpt2",
"lpt3",
"lpt4",
"lpt5",
"lpt6",
"lpt7",
"lpt8",
"lpt9",
"lpt\u00b9",
"lpt\u00b2",
"lpt\u00b3"
],
"forbidden_filename_characters": [
"<",
">",
":",
"\"",
"|",
"?",
"*",
"\\",
"\/"
],
"forbidden_filename_extensions": [
" ",
".",
".filepart",
".part"
],
"config_preset": 2,
"memories.db.triggers.fcu": true,
"memories.exiftool": "\/mnt\/storage0\/srv\/nextcloud\/www-data\/nextcloud-v34.0.0.12\/apps\/memories\/bin-ext\/exiftool-aarch64-glibc",
"memories.vod.path": "\/mnt\/storage0\/srv\/nextcloud\/www-data\/nextcloud-v34.0.0.12\/apps\/memories\/bin-ext\/go-vod-aarch64",
"memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
"memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
"enabledPreviewProviders": [
"OC\\Preview\\Image",
"OC\\Preview\\HEIC",
"OC\\Preview\\TIFF",
"OC\\Preview\\Movie"
],
"preview_max_x": 1024,
"preview_max_y": 1024,
"memories.gis_type": 2,
"app_install_overwrite": [],
"maintenance_window_start": 2
}
}
Browser
Browser name: Not a browser issue,core
Browser version: 124/125/…
Operating system: Related with Mac
Browser log
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by tracing the previewgenerator app entry point used by php occ preview:generate-all, focusing on how movie filenames are selected for preview generation. Reproduce the failure with an Apple Double ._...m4v file and identify the existing preview-generation tests, if present. Done means metadata files are skipped and the command no longer fills the server logs with failed preview errors.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- php
- Domain
- backend
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Quiet
- Clarity
- Mostly clear
- Newbie friendliness
- 55/100