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"}

[st3iny]

@sirdrakeistda I'm sorry for the late reply.

If this is still an issue, it would be nice to get the full stack track or log message of the error you posted. It looks like it might be related to your problem. It seems like the isAvailable() method is called incorrectly somewhere in the code.