Thumbnail Generation fails for HEIC images

[hulk66]

I have searched the existing issues, both open and closed, to make sure this is not a duplicate report.

• Yes

The bug

After upgrading to the latest Immich Version, there seems to be a problem with reading Photos in HEIC format

The OS that Immich Server is running on

Unraid 7.2.4

Version of Immich Server

2.7.2

Version of Immich Mobile App

2.7.2 build 253

Platform with the issue

• Server
• Web
• Mobile

Device make and model

No response

Your docker-compose.yml content

Standard Unraid Docker Application Template, worked ever since

Your .env content

Not related to environment

Reproduction steps

Not much to say here. Uploaded new photos in HEIC. Since the recent Immich upgrade preview are not generated.

The photos themselves are fine, I'm uploading them via Nextcloud and and they look fine there.

Relevant log output

[Nest] 281  - 04/09/2026, 10:31:42 AM   ERROR [Microservices:{"id":"4cf9b2a5-12f4-4632-91fb-356d008c7f3c"}] Unable to run job handler (AssetGenerateThumbnails): Error: /import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591520
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591503
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591494
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591490
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591489
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443580
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443558
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443552
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443549
heif: Decoder plugin generated an error: Unspecified (7.0)
Error: /import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591520
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591503
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591494
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591490
/import/Tobias/2026/04/26-04-09 07-18-23 4942.heic: bad seek to 591489
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443580
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443558
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443552
/import/Tobias/2026/04/26-04-08 18-08-12 4941.heic: bad seek to 1443549
heif: Decoder plugin generated an error: Unspecified (7.0)
    at Sharp.toBuffer (/app/immich/server/node_modules/.pnpm/sharp@0.34.5/node_modules/sharp/lib/output.js:163:17)
    at MediaRepository.decodeImage (/app/immich/server/dist/repositories/media.repository.js:120:31)
    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
    at async MediaService.decodeImage (/app/immich/server/dist/services/media.service.js:186:32)
    at async MediaService.extractOriginalImage (/app/immich/server/dist/services/media.service.js:197:44)
    at async MediaService.generateImageThumbnails (/app/immich/server/dist/services/media.service.js:213:32)
    at async MediaService.handleGenerateThumbnails (/app/immich/server/dist/services/media.service.js:153:25)
    at async JobService.onJobRun (/app/immich/server/dist/services/job.service.js:51:30)
    at async EventRepository.onEvent (/app/immich/server/dist/repositories/event.repository.js:91:13)
    at async /app/immich/server/node_modules/.pnpm/bullmq@5.71.0/node_modules/bullmq/dist/cjs/classes/worker.js:570:32
[Nest] 281  - 04/09/2026, 10:31:42 AM   ERROR [Microservices:{"id":"88961c72-b8e1-4953-a08c-9818889da59f"}] Unable to run job handler (AssetGenerateThumbnails): Error: heif: Decoder plugin generated an error: Unspecified (7.0)
Error: heif: Decoder plugin generated an error: Unspecified (7.0)
    at Sharp.toBuffer (/app/immich/server/node_modules/.pnpm/sharp@0.34.5/node_modules/sharp/lib/output.js:163:17)
    at MediaRepository.decodeImage (/app/immich/server/dist/repositories/media.repository.js:120:31)
    at process.processTicksAndRejections (node:internal/process/task_queues:104:5)
    at async MediaService.decodeImage (/app/immich/server/dist/services/media.service.js:186:32)
    at async MediaService.extractOriginalImage (/app/immich/server/dist/services/media.service.js:197:44)
    at async MediaService.generateImageThumbnails (/app/immich/server/dist/services/media.service.js:213:32)
    at async MediaService.handleGenerateThumbnails (/app/immich/server/dist/services/media.service.js:153:25)
    at async JobService.onJobRun (/app/immich/server/dist/services/job.service.js:51:30)
    at async EventRepository.onEvent (/app/immich/server/dist/repositories/event.repository.js:91:13)
    at async /app/immich/server/node_modules/.pnpm/bullmq@5.71.0/node_modules/bullmq/dist/cjs/classes/worker.js:570:32

Additional information

Possibly related to last comment in #27611

Thanks for this great piece of software!

[bo0tzz]

Can you share one of the files that this happens to in a .zip?

[hulk66]

=> Archiv.zip

[alextran1502]

The files are generated correctly on my test instance. I wonder if this is an issue for the dependencies on different architectures?

@hulk66 Can you share the spec of your server hardware/linux kernel...etc

cc @mertalev

[mertalev]

Is this the AIO/ImageGenius image? It's probably a difference in how it's built compared to the standard image.

[bo0tzz]

"Standard Unraid Docker Application Template", so this does indeed seem like an issue with the AIO image.

[hulk66]

yes, ghcr.io/imagegenius/immich is used. I wasn't really aware of this.

Then I have a look there for now. Thank you!

[WizenThorne]

I believe I am afflicted with the same issue with that very image.

[Tscherno]

Same issue with same setup for me. Anybody was able to fix it / workaround it? It seems that lately ALL images uploaded from two iPhones are broken. I really hope this can be fixed afterwards.

[jaysqvl]

Also having this issue

[Tscherno]

It's no Immich Issue, have a look to: imagegenius/docker-immich#680

It's solved by switching to the official Docker Image from Immich instead of the Unraid App one.