P: LrC 15.5 Video Files Issues (Windows)

Subject: Lightroom Classic 15.6 – Video Import Issues with Canon EOS R6 Mark II HEVC 10-bit 4:2:2 Footage

Hi everyone

I am experiencing the same problems importing videos into Lightroom Classic 15.6 on Windows 11. When importing certain videos recorded with my Canon EOS R6 Mark II, I receive the following error messages:

• "Unknown error"
• "Preview unavailable for this file"

Interestingly, some videos import without any problems, while others fail.

I have been able to identify the difference:

Videos that import successfully:

• MP4
• H.264 High
• Level 5.1

Videos that fail to import:

• MP4
• H.265 / HEVC Main 10
• 10-bit
• Chroma subsampling 4:2:2
• Level 5.1

All videos were recorded in 4K at 25 fps using Canon Log. (No changes at the cam with all vids)

Copying the problematic files to my desktop does not resolve the issue.

I would like to know whether a fix for Lightroom Classic is planned… and when… 

I would very much like to be able to import and manage my original 10-bit C-Log footage directly in Lightroom without having to convert the files beforehand via DaVinciResolve.

@ Adobe Support Team: Thank you for your help. I’m looking forward to your feedback.

Downgraded to 15.4. Adobe, guys, get your [cursing removed] together. We pay you money for this. 

Vielen Dank, ich bin jetzt sehr froh, das ich nicht allein mit diesem Problem bin und hoffe auf ein Update von Lr was diesen Fehler wieder behebt.

Die nicht vorhandene Reaktion von Adobe zur schnellsten Behebung dieses signifikanten Fehlers, zeigt die Ignoranz bei der Kundenunterstützung deutlich. Dieser Fehler aus Version 15.5. hätte spätestens mit der Version 15.6. behoben sein müssen.

[View this post in your web browser. It contains formatting and images that don't appear in email.]

Are you on Windows? Adobe has acknowledged a general bug with the handling of videos introduced in LR 15.5 and not yet fixed in LR 15.6:

https://community.adobe.com/bug-reports-674/p-lrc-15-5-video-files-issues-windows-1635342

The only known workaround is to roll back to LR 15.4. 

If you’re not on Windows, please do the LR menu command Help > System Info, click the Copy button in the upper right corner, and paste into your reply here, so we can see exactly which versions of hardware and software LR thinks you're running and important LR options that are set. 

Bisher war es kein Problem in LR Classic *mov Dateien anzuschauen und auch zu öffnen.

Seit kurzem kommt dann eine Fehlermeldung und ein schwarzer Hintergrund: Beim Arbeiten mit dem Foto ist ein Fehler aufgetreten.

Hat jemand ähnliche Probleme oder kann helfen?

MacOS with the current version of LRC has no issue, but Lightroom Windows 11 (Lightroom Classic version: 15.6 
Operating system: Windows 11 - Business Edition
Version: 11.0.26200
Application architecture: x64
System architecture: x64)

gives the dreaded  “An unknown error occurred while reading the video file” for videos from an iphone 15 pro and a Sony A7RV running the latest firmware. Absurd that Adobe is just letting this regression go uncorrected. 

It seems this thread is related

I have the same issue with LrC15.6. I’m using the HEVC codec. The Windows Media Player plays the videos, also the VLC, PremiereElements2024  and Lightroom (not Classic). The bug is limited to LrC15.6.

Same issue here with LrC15.6. Have the HEVC codec. Windows plays the videos. Opening the very same video files in Lr Desktop 9.6 from the very same local folder works without issue. So the failure is limited to LrC15.6.