Repeated Errors in log with no real hint what is the problem

ℹ️ Support
1

Hi,

I’m running

Nextcloud version: 25.0.4
Operating system and version: Ubuntu 22.04.2 LTS
nginx: 1.18.0
PHP version: 8.1.16
nodejs (custom) version: 19.7.0

after setting up the recognize app and recognition running - as per the app -, I repeatedly have the same few error messages in the Log, that I can’t get a hint out of what actually is wrong. I currently have face and object recognition running. The last classification for objectrecognition is usually within the last few seconds. But Face recognition currently stands at 2 hours. On earlier runs (I restarted recognition of the entire library multiple times) I’ve seen face recognition go up to multiple days.

Steps to replicate it:

Honestly, I have no idea what triggered this in the first place

The output of your Nextcloud log in Admin > Logging:

As I said, there are multiple repeated log entries. These are

[PHP] Fehler: Error: imagecreatefromstring(): Couldn't create GD Image Stream out of Data at /var/www/nextcloud/lib/private/legacy/OC_Image.php#758 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError()
 1. /var/www/nextcloud/lib/private/legacy/OC_Image.php line 758
    imagecreatefromstring("*** sensitive parameters replaced ***")
 2. /var/www/nextcloud/lib/private/Preview/Image.php line 52
    OC_Image->loadFromFile()
 3. /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php line 65
    OC\Preview\Image->getThumbnail()
 4. /var/www/nextcloud/lib/private/Preview/Generator.php line 343
    OC\Preview\GeneratorHelper->getThumbnail()
 5. /var/www/nextcloud/lib/private/Preview/Generator.php line 162
    OC\Preview\Generator->getMaxPreview()
 6. /var/www/nextcloud/lib/private/Preview/Generator.php line 114
    OC\Preview\Generator->generatePreviews()
 7. /var/www/nextcloud/lib/private/PreviewManager.php line 185
    OC\Preview\Generator->getPreview()
 8. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 255
    OC\PreviewManager->getPreview()
 9. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 84
    OCA\Recognize\Classifiers\Classifier->getConvertedFilePath()
10. /var/www/nextcloud/apps/recognize/lib/Classifiers/Images/ImagenetClassifier.php line 47
    OCA\Recognize\Classifiers\Classifier->classifyFiles()
11. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 41
    OCA\Recognize\Classifiers\Images\ImagenetClassifier->classify()
12. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifierJob.php line 70
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->classify()
13. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 33
    OCA\Recognize\BackgroundJobs\ClassifierJob->runClassifier()
14. /var/www/nextcloud/lib/public/BackgroundJob/Job.php line 78
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->run()
15. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 103
    OCP\BackgroundJob\Job->start()
16. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 93
    OCP\BackgroundJob\TimedJob->start()
17. /var/www/nextcloud/cron.php line 152
    OCP\BackgroundJob\TimedJob->execute()

at 2023-03-08T15:31:22+00:00

[PHP] Fehler: Error: imagecreatefromstring(): Passed data is not in "WBMP" format at /var/www/nextcloud/lib/private/legacy/OC_Image.php#758 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError()
 1. /var/www/nextcloud/lib/private/legacy/OC_Image.php line 758
    imagecreatefromstring("*** sensitive parameters replaced ***")
 2. /var/www/nextcloud/lib/private/Preview/Image.php line 52
    OC_Image->loadFromFile()
 3. /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php line 65
    OC\Preview\Image->getThumbnail()
 4. /var/www/nextcloud/lib/private/Preview/Generator.php line 343
    OC\Preview\GeneratorHelper->getThumbnail()
 5. /var/www/nextcloud/lib/private/Preview/Generator.php line 162
    OC\Preview\Generator->getMaxPreview()
 6. /var/www/nextcloud/lib/private/Preview/Generator.php line 114
    OC\Preview\Generator->generatePreviews()
 7. /var/www/nextcloud/lib/private/PreviewManager.php line 185
    OC\Preview\Generator->getPreview()
 8. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 255
    OC\PreviewManager->getPreview()
 9. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 84
    OCA\Recognize\Classifiers\Classifier->getConvertedFilePath()
10. /var/www/nextcloud/apps/recognize/lib/Classifiers/Images/ImagenetClassifier.php line 47
    OCA\Recognize\Classifiers\Classifier->classifyFiles()
11. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 41
    OCA\Recognize\Classifiers\Images\ImagenetClassifier->classify()
12. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifierJob.php line 70
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->classify()
13. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 33
    OCA\Recognize\BackgroundJobs\ClassifierJob->runClassifier()
14. /var/www/nextcloud/lib/public/BackgroundJob/Job.php line 78
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->run()
15. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 103
    OCP\BackgroundJob\Job->start()
16. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 93
    OCP\BackgroundJob\TimedJob->start()
17. /var/www/nextcloud/cron.php line 152
    OCP\BackgroundJob\TimedJob->execute()

at 2023-03-08T15:31:22+00:00

[PHP] Fehler: Error: imagecreatefromstring(): one parameter to a memory allocation multiplication is negative or zero, failing operation gracefully
 at /var/www/nextcloud/lib/private/legacy/OC_Image.php#758 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError()
 1. /var/www/nextcloud/lib/private/legacy/OC_Image.php line 758
    imagecreatefromstring("*** sensitive parameters replaced ***")
 2. /var/www/nextcloud/lib/private/Preview/Image.php line 52
    OC_Image->loadFromFile()
 3. /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php line 65
    OC\Preview\Image->getThumbnail()
 4. /var/www/nextcloud/lib/private/Preview/Generator.php line 343
    OC\Preview\GeneratorHelper->getThumbnail()
 5. /var/www/nextcloud/lib/private/Preview/Generator.php line 162
    OC\Preview\Generator->getMaxPreview()
 6. /var/www/nextcloud/lib/private/Preview/Generator.php line 114
    OC\Preview\Generator->generatePreviews()
 7. /var/www/nextcloud/lib/private/PreviewManager.php line 185
    OC\Preview\Generator->getPreview()
 8. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 255
    OC\PreviewManager->getPreview()
 9. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 84
    OCA\Recognize\Classifiers\Classifier->getConvertedFilePath()
10. /var/www/nextcloud/apps/recognize/lib/Classifiers/Images/ImagenetClassifier.php line 47
    OCA\Recognize\Classifiers\Classifier->classifyFiles()
11. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 41
    OCA\Recognize\Classifiers\Images\ImagenetClassifier->classify()
12. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifierJob.php line 70
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->classify()
13. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 33
    OCA\Recognize\BackgroundJobs\ClassifierJob->runClassifier()
14. /var/www/nextcloud/lib/public/BackgroundJob/Job.php line 78
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->run()
15. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 103
    OCP\BackgroundJob\Job->start()
16. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 93
    OCP\BackgroundJob\TimedJob->start()
17. /var/www/nextcloud/cron.php line 152
    OCP\BackgroundJob\TimedJob->execute()

at 2023-03-08T15:31:22+00:00

[PHP] Fehler: Error: imagecreatefromstring(): Couldn't create GD Image Stream out of Data at /var/www/nextcloud/lib/private/legacy/OC_Image.php#758 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError()
 1. /var/www/nextcloud/lib/private/legacy/OC_Image.php line 758
    imagecreatefromstring("*** sensitive parameters replaced ***")
 2. /var/www/nextcloud/lib/private/Preview/Image.php line 52
    OC_Image->loadFromFile()
 3. /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php line 65
    OC\Preview\Image->getThumbnail()
 4. /var/www/nextcloud/lib/private/Preview/Generator.php line 343
    OC\Preview\GeneratorHelper->getThumbnail()
 5. /var/www/nextcloud/lib/private/Preview/Generator.php line 162
    OC\Preview\Generator->getMaxPreview()
 6. /var/www/nextcloud/lib/private/Preview/Generator.php line 114
    OC\Preview\Generator->generatePreviews()
 7. /var/www/nextcloud/lib/private/PreviewManager.php line 185
    OC\Preview\Generator->getPreview()
 8. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 255
    OC\PreviewManager->getPreview()
 9. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 84
    OCA\Recognize\Classifiers\Classifier->getConvertedFilePath()
10. /var/www/nextcloud/apps/recognize/lib/Classifiers/Images/ImagenetClassifier.php line 47
    OCA\Recognize\Classifiers\Classifier->classifyFiles()
11. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 41
    OCA\Recognize\Classifiers\Images\ImagenetClassifier->classify()
12. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifierJob.php line 70
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->classify()
13. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 33
    OCA\Recognize\BackgroundJobs\ClassifierJob->runClassifier()
14. /var/www/nextcloud/lib/public/BackgroundJob/Job.php line 78
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->run()
15. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 103
    OCP\BackgroundJob\Job->start()
16. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 93
    OCP\BackgroundJob\TimedJob->start()
17. /var/www/nextcloud/cron.php line 152
    OCP\BackgroundJob\TimedJob->execute()

at 2023-03-08T15:31:21+00:00

[PHP] Fehler: Error: imagecreatefromstring(): Passed data is not in "WBMP" format at /var/www/nextcloud/lib/private/legacy/OC_Image.php#758 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError()
 1. /var/www/nextcloud/lib/private/legacy/OC_Image.php line 758
    imagecreatefromstring("*** sensitive parameters replaced ***")
 2. /var/www/nextcloud/lib/private/Preview/Image.php line 52
    OC_Image->loadFromFile()
 3. /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php line 65
    OC\Preview\Image->getThumbnail()
 4. /var/www/nextcloud/lib/private/Preview/Generator.php line 343
    OC\Preview\GeneratorHelper->getThumbnail()
 5. /var/www/nextcloud/lib/private/Preview/Generator.php line 162
    OC\Preview\Generator->getMaxPreview()
 6. /var/www/nextcloud/lib/private/Preview/Generator.php line 114
    OC\Preview\Generator->generatePreviews()
 7. /var/www/nextcloud/lib/private/PreviewManager.php line 185
    OC\Preview\Generator->getPreview()
 8. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 255
    OC\PreviewManager->getPreview()
 9. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 84
    OCA\Recognize\Classifiers\Classifier->getConvertedFilePath()
10. /var/www/nextcloud/apps/recognize/lib/Classifiers/Images/ImagenetClassifier.php line 47
    OCA\Recognize\Classifiers\Classifier->classifyFiles()
11. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 41
    OCA\Recognize\Classifiers\Images\ImagenetClassifier->classify()
12. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifierJob.php line 70
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->classify()
13. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 33
    OCA\Recognize\BackgroundJobs\ClassifierJob->runClassifier()
14. /var/www/nextcloud/lib/public/BackgroundJob/Job.php line 78
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->run()
15. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 103
    OCP\BackgroundJob\Job->start()
16. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 93
    OCP\BackgroundJob\TimedJob->start()
17. /var/www/nextcloud/cron.php line 152
    OCP\BackgroundJob\TimedJob->execute()

at 2023-03-08T15:31:21+00:00

[PHP] Fehler: Error: imagecreatefromstring(): one parameter to a memory allocation multiplication is negative or zero, failing operation gracefully
 at /var/www/nextcloud/lib/private/legacy/OC_Image.php#758 at <<closure>>

 0. <<closure>>
    OC\Log\ErrorHandler::onError()
 1. /var/www/nextcloud/lib/private/legacy/OC_Image.php line 758
    imagecreatefromstring("*** sensitive parameters replaced ***")
 2. /var/www/nextcloud/lib/private/Preview/Image.php line 52
    OC_Image->loadFromFile()
 3. /var/www/nextcloud/lib/private/Preview/GeneratorHelper.php line 65
    OC\Preview\Image->getThumbnail()
 4. /var/www/nextcloud/lib/private/Preview/Generator.php line 343
    OC\Preview\GeneratorHelper->getThumbnail()
 5. /var/www/nextcloud/lib/private/Preview/Generator.php line 162
    OC\Preview\Generator->getMaxPreview()
 6. /var/www/nextcloud/lib/private/Preview/Generator.php line 114
    OC\Preview\Generator->generatePreviews()
 7. /var/www/nextcloud/lib/private/PreviewManager.php line 185
    OC\Preview\Generator->getPreview()
 8. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 255
    OC\PreviewManager->getPreview()
 9. /var/www/nextcloud/apps/recognize/lib/Classifiers/Classifier.php line 84
    OCA\Recognize\Classifiers\Classifier->getConvertedFilePath()
10. /var/www/nextcloud/apps/recognize/lib/Classifiers/Images/ImagenetClassifier.php line 47
    OCA\Recognize\Classifiers\Classifier->classifyFiles()
11. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 41
    OCA\Recognize\Classifiers\Images\ImagenetClassifier->classify()
12. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifierJob.php line 70
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->classify()
13. /var/www/nextcloud/apps/recognize/lib/BackgroundJobs/ClassifyImagenetJob.php line 33
    OCA\Recognize\BackgroundJobs\ClassifierJob->runClassifier()
14. /var/www/nextcloud/lib/public/BackgroundJob/Job.php line 78
    OCA\Recognize\BackgroundJobs\ClassifyImagenetJob->run()
15. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 103
    OCP\BackgroundJob\Job->start()
16. /var/www/nextcloud/lib/public/BackgroundJob/TimedJob.php line 93
    OCP\BackgroundJob\TimedJob->start()
17. /var/www/nextcloud/cron.php line 152
    OCP\BackgroundJob\TimedJob->execute()

at 2023-03-08T15:31:21+00:00

If there is any additional information necessary, I’ll be happy to provide it. I hope someone here can decipher these log entries

2

Mh, something’s going wrong when generating previews from your images. Recognize asks nextcloud for smaller versions of the images to not burst your RAM during classification.

3

I’ve read in other posts, that sometimes a large image with wrong extension can cause problems. Is there a way to figure out at what exact file the error occurs?

4

Setting log level to debug should reveal some log messages mentioning for which file a preview is requested.

5

You can also run the preview generator manually from the console, it will show you the file that its processing. ./occ preview:generate-all -vvv

6

am I missing something here? There’s no command for preview generate-all

 preview
  preview:repair                         distributes the existing previews into subfolders
  preview:reset-rendered-texts           Deletes all generated avatars and previews of text and md files

EDIT: preview generator was not installed, I’m just dumb :slight_smile:

7

Hehehe… Glad you got it working!