Preview is not generating for .jpg and .mp4

[sirdrakeistda]

Steps to reproduce

1. reinstall preview-generator by using the .tar
2. occ preview:generate /user/files/....jpg -vvv returns following error:

In Generator.php line 366:
                                                           
  [OCP\Files\NotFoundException]                            
  No provider successfully handled the preview generation  
                                                           

Exception trace:
  at /var/www/nextcloud/lib/private/Preview/Generator.php:366
 OC\Preview\Generator->generateProviderPreview() at /var/www/nextcloud/lib/private/Preview/Generator.php:313
 OC\Preview\Generator->getMaxPreview() at /var/www/nextcloud/lib/private/Preview/Generator.php:117
 OC\Preview\Generator->generatePreviews() at /var/www/nextcloud/lib/private/PreviewManager.php:182
 OC\PreviewManager->generatePreviews() at /var/www/nextcloud/core/Command/Preview/Generate.php:92
 OC\Core\Command\Preview\Generate->execute() at /var/www/nextcloud/3rdparty/symfony/console/Command/Command.php:326
 Symfony\Component\Console\Command\Command->run() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:1078
 Symfony\Component\Console\Application->doRunCommand() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:324
 Symfony\Component\Console\Application->doRun() at /var/www/nextcloud/3rdparty/symfony/console/Application.php:175
 Symfony\Component\Console\Application->run() at /var/www/nextcloud/lib/private/Console/Application.php:187
 OC\Console\Application->run() at /var/www/nextcloud/console.php:90
 require_once() at /var/www/nextcloud/occ:33

preview:generate [-s|--size SIZE] [-c|--crop] [-m|--mode MODE] [--] <file>

When I try the same with a .png file everything works as expected

Server configuration

Web server: Apache

Database: MySQL

PHP version: 8.4

Nextcloud version: 32.0.2

List of activated apps

  - activity: 5.0.0-dev.0
  - analytics: 6.0.1
  - assistant: 2.9.0
  - bruteforcesettings: 5.0.0-dev.0
  - calendar: 6.1.0
  - circles: 32.0.0
  - cloud_federation_api: 1.16.0
  - comments: 1.22.0
  - contacts: 8.1.0
  - contactsinteraction: 1.13.1
  - cookbook: 0.11.5
  - dashboard: 7.12.0
  - dav: 1.34.2
  - deck: 1.16.2
  - facerecognition: 0.9.70
  - federatedfilesharing: 1.22.0
  - federation: 1.22.0
  - files: 2.4.0
  - files_automatedtagging: 3.0.1
  - files_downloadlimit: 5.0.0-dev.0
  - files_external: 1.24.0
  - files_pdfviewer: 5.0.0-dev.0
  - files_reminders: 1.5.0
  - files_retention: 3.0.0
  - files_sharing: 1.24.1
  - files_trashbin: 1.22.0
  - files_versions: 1.25.0
  - firstrunwizard: 5.0.0-dev.0
  - integration_github: 3.2.2
  - integration_openai: 3.9.1
  - integration_openstreetmap: 3.0.0
  - integration_overleaf: 1.1.0
  - integration_replicate: 4.2.0
  - logreader: 5.0.0-dev.0
  - lookup_server_connector: 1.20.0
  - mail: 5.6.0
  - maps: 1.6.0
  - memories: 7.7.0
  - music: 2.4.1
  - news: 27.2.0
  - nextcloud_announcements: 4.0.0-dev.0
  - nextcloudpi: 0.0.2
  - notes: 4.12.3
  - notifications: 5.0.0-dev.0
  - notify_push: 1.2.1
  - oauth2: 1.20.0
  - password_policy: 4.0.0-dev.0
  - phonetrack: 0.9.1
  - photos: 5.0.0-dev.1
  - previewgenerator: 5.11.0
  - privacy: 4.0.0-dev.0
  - profile: 1.1.0
  - provisioning_api: 1.22.0
  - recognize: 10.0.6
  - recommendations: 5.0.0-dev.0
  - related_resources: 3.0.0-dev.0
  - richdocuments: 9.0.1
  - richdocumentscode_arm64: 25.4.702
  - serverinfo: 4.0.0-dev.0
  - settings: 1.15.1
  - sharebymail: 1.22.0
  - spreed: 22.0.4
  - support: 4.0.0-dev.0
  - survey_client: 4.0.0-dev.0
  - suspicious_login: 10.0.0-dev.0
  - systemtags: 1.22.0
  - talk_matterbridge: 1.32.1026000
  - tasks: 0.17.1
  - text: 6.0.1
  - theming: 2.7.0
  - twofactor_backupcodes: 1.21.0
  - unsplash: 3.1.0
  - updatenotification: 1.22.0
  - user_status: 1.12.0
  - viewer: 5.0.0-dev.0
  - weather_status: 1.12.0
  - webhook_listeners: 1.3.0
  - workflowengine: 2.14.0
Disabled:
  - admin_audit: 1.22.0
  - app_api: 32.0.0 (installed 32.0.0)
  - encryption: 2.20.0
  - twofactor_nextcloud_notification: 6.0.0-dev.0
  - twofactor_totp: 14.0.0
  - user_ldap: 1.23.0

Nextcloud configuration

{
    "system": {
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": {
            "0": "localhost",
            "5": "nextcloudpi.local",
            "7": "nextcloudpi",
        },
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "dbtype": "mysql",
        "version": "32.0.2.2",
        "overwrite.cli.url": "https:\/\/nextcloudpi\/",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "default_locale": "de_DE",
        "default_language": "de",
        "default_phone_region": "DE",
        "dbtableprefix": "oc_",
        "mysql.utf8mb4": true,
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "installed": true,
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "filelocking.enabled": true,
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "timeout": 0,
            "password": "***REMOVED SENSITIVE VALUE***"
        },
        "tempdirectory": "\/media\/myCloudDrive\/ncdata\/tmp",
        "mail_smtpmode": "sendmail",
        "mail_smtpauthtype": "LOGIN",
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "preview_max_x": "8000",
        "preview_max_y": "8000",
        "preview_max_memory": 8192,
        "preview_max_filesize_image": 256,
        "jpeg_quality": 60,
        "overwriteprotocol": "https",
        "maintenance": false,
        "maintenance_window_start": 1,
        "logfile": "\/media\/myCloudDrive\/ncdata\/nextcloud.log",
        "loglevel": 0,
        "log_type": "file",
        "theme": "",
        "trashbin_retention_obligation": "auto, 365",
        "updater.release.channel": "stable",
        "app_install_overwrite": {
            "0": "cookbook",
            "3": "passman",
            "4": "talk_matterbridge",
            "5": "suspicious_login",
            "6": "terms_of_service",
            "7": "unsplash",
            "8": "music",
            "9": "bruteforcesettings",
            "10": "video_converter",
            "11": "quota_warning",
            "12": "polls",
            "13": "deck",
            "14": "flow_notifications",
            "15": "richdocumentscode_arm64",
            "16": "cms_pico",
            "17": "phonetrack",
            "18": "tasks",
            "19": "news",
            "20": "facerecognition",
            "21": "memories",
            "22": "maps",
            "23": "files_retention",
            "24": "llm",
            "25": "forms",
            "26": "integration_github",
            "27": "integration_jupyterhub",
            "28": "nextcloudpi"
        },
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "data-fingerprint": "4c7943cffe4b7905097aa89c6878d08f",
        "enable_previews": true,
        "enabledPreviewProviders": {
            "0": "OC\\Preview\\Image",
            "1": "OC\\Preview\\Movie",
            "5": "OC\\Preview\\JPEG"
        },
        "memories.exiftool": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/exiftool-aarch64-glibc",
        "memories.no_transcode": false,
        "memories.ffmpeg_path": "\/usr\/bin\/ffmpeg",
        "memories.ffprobe_path": "\/usr\/bin\/ffprobe",
        "memories.transcoder": "\/var\/www\/nextcloud\/apps\/memories\/exiftool-bin\/go-vod-aarch64",
        "memories.qsv": true,
        "memories.vod.ffmpeg": "\/usr\/bin\/ffmpeg",
        "memories.vod.ffprobe": "\/usr\/bin\/ffprobe",
        "memories.vod.disable": true,
        "memories.vod.path": "\/var\/www\/nextcloud\/apps\/memories\/bin-ext\/go-vod-aarch64",
        "memories.gis_type": 1,
        "memories.db.triggers.fcu": true,
        "defaultapp": "",
        "htaccess.RewriteBase": "",
        "updater.secret": "***REMOVED SENSITIVE VALUE***"
    }
}

Trying to convert the image manually (using the convert command) does work. ffmpeg and imagemagick are installed.

[st3iny]

Hi, first of all the preview:generate command is not part of this app. It is part of the core Nextcloud server code in https://github.com/nextcloud/server.

Could you please remove the OC\\Preview\\Image provider from the enabledPreviewProviders list? It should not be in there as it is an abstract class. It should look something like that:

        "enabledPreviewProviders" => [
            "OC\\Preview\\Movie",
            "OC\\Preview\\JPEG"
        ],

Also, please post the output of: php -m | grep -i gd
The GD extension is required for most image actions.

[sirdrakeistda]

I removed the Image provider and here is the result from the command:

# php -m | grep -i gd
gd

So this shouldn't be a problem. Nothing has changed yet. Still the same Problem.

[st3iny]

Ok, then perhaps there is a problem with the file you are trying to generate a preview for.

Please try to scan the user's directories again:

occ files:scan -vv <user>

Replace with the name of the user which owns the file in question. Note that this command might take a while to complete.

[sirdrakeistda]

I did this already without any progress. After this command I tried the command I mentioned in my issue. When I choose a specific file (example.jpg), I get the error no preview provider found. With .png it works without problem.

[st3iny]

Good, let's check the app data directory next: occ files:scan-app-data -vv

Please check if there are any error reported during the scan. Afterwards, try generating the preview again.

[sirdrakeistda]

Sorry for the late reply. This command works without any problems or errors. I tried afterwards this command:

sudo -u www-data php /var/www/nextcloud/occ preview:generate user/files/IMG_2025.jpg

I still get the error "no provider succesfully handled the preview generation". (This commands works for .png without any problems, JPEG is still mentioned in nextcloud config.)

[sirdrakeistda]

Diesen Fehler habe ich noch in den Naxtcloud Logs gefunden:
{"reqId":"TXasNIVeUNcG1iHymzLa","level":3,"time":"2025-12-16T17:02:30+00:00","remoteAddr":"","user":"--","app":"PHP","method":"","url":"--","message":"Uncaught ArgumentCountError: Too few arguments to function OC\Preview\ProviderV2::isAvailable(), 0 passed in Command line code on line 4 and exactly 1 expected in /var/www/nextcloud/lib/private/Preview/ProviderV2.php:39\nStack trace:\n#0 Command line code(4): OC\Preview\ProviderV2->isAvailable()\n#1 {main}\n thrown at /var/www/nextcloud/lib/private/Preview/ProviderV2.php#39","userAgent":"--","version":"32.0.3.2","data":{"app":"PHP"},"id":"6941927c7d1b4"}