nextcloud/previewgenerator

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Nextcloud app to do preview generation in the background.

Stars: 520
Forks: 55
Open beginner issues: 0
Indexed issues: 70

Dominant language: PHP
License: AGPL-3.0
Last GitHub push: Jul 6, 2026
Latest indexed: Sep 19, 2026
Contributing guide: Contributing guide
Code of conduct: No code of conduct
Beginner labels: No beginner labels indexed
PR merge metrics: No merged PRs in 30d

Beginner friendly Everything

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70 issues indexed so far

Released app incompatible with Nextcloud 35 Open

bug

Difficulty 2/5 1-3 hours Newbie friendliness 45/100

nextcloud/previewgenerator#677 · 13 reactions · Opened Sep 17, 2026
disabling the background job does not disable the preview generation in `cron.php` Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 68/100

nextcloud/previewgenerator#676 · Opened Sep 12, 2026
Cleaning generated previews doesn't clean up database entries. Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

nextcloud/previewgenerator#670 · 1 comment · 1 reaction · Opened Jul 27, 2026
Error on preview generator of metadata/cache OS files. Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 55/100

nextcloud/previewgenerator#667 · Opened Jul 12, 2026
occ:preview:generate-all not supported Open

Difficulty 2/5 1-3 hours Newbie friendliness 52/100

nextcloud/previewgenerator#652 · 2 comments · Opened Apr 25, 2026
preview:generate-all crashses without an error Open

bug needs info

Difficulty 5/5 Over a week Newbie friendliness 38/100

nextcloud/previewgenerator#641 · 9 comments · Opened Feb 26, 2026
Add `preview:queue-all` command to queue all media files for the background job Open

1. to develop enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nextcloud/previewgenerator#622 · 3 reactions · Opened Feb 1, 2026
Preview is not generating for .jpg and .mp4 Open

bug needs info

Difficulty 4/5 3-5 days Newbie friendliness 28/100

nextcloud/previewgenerator#593 · 8 comments · Opened Nov 21, 2025
Generating previews on encrypted files let generator fail Open

1. to develop bug

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nextcloud/previewgenerator#572 · 5 comments · 1 reaction · Opened Oct 23, 2025
Batch generation Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nextcloud/previewgenerator#555 · 3 comments · Opened Jul 27, 2025
Peview Generator refueses to make thumbnails for videos from Samsung (any android version) phones Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 38/100

nextcloud/previewgenerator#546 · 11 comments · 3 reactions · Opened Jun 10, 2025
Limit the generated image dimension combinations Open

0. to triage bug needs info

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nextcloud/previewgenerator#529 · 2 comments · Opened Dec 10, 2024
[Bug]: Max sized preview gets generated, regardless of specifications Open

bug

Difficulty 3/5 1-2 days Newbie friendliness 48/100

nextcloud/previewgenerator#518 · 5 comments · 1 reaction · Opened Oct 13, 2024
Generate Previews only for real files and not shared ones. Open

enhancement needs info

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nextcloud/previewgenerator#514 · 3 comments · 4 reactions · Opened Sep 28, 2024
Add a limit to amount of previews that can be generated by a single call to pre-generate Open

1. to develop enhancement

Difficulty 5/5 Over a week Newbie friendliness 30/100

nextcloud/previewgenerator#513 · 1 comment · Opened Sep 25, 2024
Question: what preview sizes are used in different apps? Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#502 · 1 comment · Opened Aug 6, 2024
oc_filecache table with inconsistent entries (size = -1) Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nextcloud/previewgenerator#500 · 3 comments · Opened Aug 1, 2024
Add a timeout to preview generator. Open

Difficulty 4/5 3-5 days Newbie friendliness 38/100

nextcloud/previewgenerator#489 · 3 comments · 3 reactions · Opened Jul 1, 2024
Exclude folders from the initial generation by their names Open

1. to develop enhancement

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nextcloud/previewgenerator#486 · 3 comments · Opened Jun 25, 2024
Undefined array key "previews" at /var/www/nextcloud/apps/previewgenerator/lib/Command/Generate.php#160 Open

bug needs info

Difficulty 3/5 1-2 days Newbie friendliness 38/100

nextcloud/previewgenerator#465 · 9 comments · 1 reaction · Opened Apr 21, 2024
[OCP\Files\NotPermittedException] Could not create folder "/appdata_ocfmw89yr7pg/preview/a/b/a/d/2/c/9/34634" Version 5.4.0 Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nextcloud/previewgenerator#453 · 7 comments · Opened Mar 2, 2024
TypeError: OC_Image::getOrientation(): Return value must be of type int, array returned Open

bug dependencies needs info

Difficulty 3/5 1-2 days Newbie friendliness 45/100

nextcloud/previewgenerator#452 · 4 comments · Opened Feb 27, 2024
Preview-Generator + Groupfolder + read-only Link-Share = Previews cannot be loaded (404) Open

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nextcloud/previewgenerator#447 · 1 comment · Opened Feb 5, 2024
Optimization Python script Open

performance

Difficulty 5/5 Over a week Newbie friendliness 20/100

nextcloud/previewgenerator#443 · 6 comments · Opened Jan 29, 2024
Error: Source file could not be loaded Open

0. to triage bug needs info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#440 · 16 comments · Opened Jan 18, 2024
very slow preview load and HTTP500 - Postgresql database index missing for storage+path_hash Open

0. to triage needs info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#439 · 4 comments · Opened Jan 13, 2024
Timestamp of thumbnail in video Open

question

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nextcloud/previewgenerator#437 · 1 comment · Opened Jan 9, 2024
Limit 'preview:pre-generate' to specific paths or users Open

1. to develop enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nextcloud/previewgenerator#422 · 6 comments · Opened Oct 25, 2023
OCP\Files\NotPermittedException: Could not create folder Open

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#421 · 8 comments · 5 reactions · Opened Oct 4, 2023
Redis issue with previewgenerator -> 503 server Open

0. to triage bug needs info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#416 · 3 comments · Opened Sep 14, 2023
Ignore incoming federated shares e.g. `occ preview:generate-all --local-only` Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nextcloud/previewgenerator#402 · 2 comments · Opened Jun 24, 2023
setting preview size error from occ command Open

docs question

Difficulty 2/5 1-3 hours Newbie friendliness 25/100

nextcloud/previewgenerator#401 · 3 comments · Opened Jun 23, 2023
Preview Generator does not create all previews Open

0. to triage bug docs needs info

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#396 · 1 comment · Opened May 30, 2023
Mp4 previews are being correctly generated but not showing, except for trash folder [bug] Open

0. to triage bug server or provider related

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nextcloud/previewgenerator#355 · 5 comments · 2 reactions · Opened Feb 13, 2023
[Bug]: Mysql Deadlock (Serialization failure) on occ preview:genherate-all command with large SMB share Open

bug wontfix

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#354 · 1 comment · Opened Feb 12, 2023
Generate preview for images and videos only Open

docs question

Difficulty 3/5 1-2 days Newbie friendliness 35/100

nextcloud/previewgenerator#351 · 2 comments · Opened Jan 30, 2023
preview:generate-all finishes without error but doesn't seem to process all files Open

0. to triage bug

Difficulty 4/5 3-5 days Newbie friendliness 47/100

nextcloud/previewgenerator#349 · 14 comments · 1 reaction · Opened Jan 26, 2023
MP4 previews generated but not shown Open

0. to triage bug needs info

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nextcloud/previewgenerator#335 · 5 comments · Opened Jan 16, 2023
Video previews are generated but not shown Open

bug needs info

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nextcloud/previewgenerator#327 · 4 comments · Opened Nov 21, 2022
Empty directories left after removing previews of deleted images Open

0. to triage bug server or provider related

Difficulty 3/5 1-2 days Newbie friendliness 38/100

nextcloud/previewgenerator#303 · 1 comment · 3 reactions · Opened Jun 26, 2022
Settings for preview sizes are ignored Open

bug docs

Difficulty 3/5 1-2 days Newbie friendliness 30/100

nextcloud/previewgenerator#298 · 1 comment · 4 reactions · Opened May 23, 2022
`OCP\Files\NotPermittedException` `Could not create folder` Open

1. to develop bug

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#289 · 34 comments · 6 reactions · Opened Feb 7, 2022
Some files does not seems to be treated with no errors Open

0. to triage bug

Difficulty 4/5 3-5 days Newbie friendliness 30/100

nextcloud/previewgenerator#276 · 2 comments · Opened Dec 22, 2021
Movie preview generation failed Output - Multiple Errors Open

0. to triage bug

Difficulty 3/5 1-2 days Newbie friendliness 25/100

nextcloud/previewgenerator#266 · 6 comments · 4 reactions · Opened Dec 4, 2021
preview:generate-all only running for one user Open

1. to develop bug docs

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#263 · 4 comments · Opened Nov 18, 2021
Federated shares seem to be ignored Open

1. to develop enhancement

Difficulty 4/5 3-5 days Newbie friendliness 42/100

nextcloud/previewgenerator#248 · 3 reactions · Opened Aug 24, 2021
occ preview doesn't create thumbnails on S3 primary storage Open

0. to triage bug needs info

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nextcloud/previewgenerator#247 · 3 comments · Opened Aug 20, 2021
Prevent duplicate previews in shared folders Open

1. to develop enhancement

Difficulty 4/5 3-5 days Newbie friendliness 35/100

nextcloud/previewgenerator#245 · 1 comment · 17 reactions · Opened Jul 24, 2021
ImagickException: negative or zero image size `' @ error/image.c/SetImageExtent/2649 Open

Difficulty 4/5 3-5 days Newbie friendliness 15/100

nextcloud/previewgenerator#229 · Opened Mar 22, 2021
Error: Method Intervention\Image\Image::__toString() Open

server or provider related

Difficulty 4/5 3-5 days Newbie friendliness 25/100

nextcloud/previewgenerator#228 · Opened Mar 15, 2021

nextcloud/previewgenerator

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