[dolphin] [Bug 485572] New: Video thumbnails using ffmpegthumbs stopped working within gocryptfs mounts after updating to KDE frameworks 6.1

[SC]

https://bugs.kde.org/show_bug.cgi?id=485572

            Bug ID: 485572
           Summary: Video thumbnails using ffmpegthumbs stopped working
                    within gocryptfs mounts after updating to KDE
                    frameworks 6.1
    Classification: Applications
           Product: dolphin
           Version: 24.02.2
          Platform: Arch Linux
                OS: Linux
            Status: REPORTED
          Severity: normal
          Priority: NOR
         Component: general
          Assignee: dolphin-bugs-null at kde.org
          Reporter: kde at scheimong.net
                CC: kfm-devel at kde.org
  Target Milestone: ---

* This is a repost of
https://gitlab.archlinux.org/archlinux/packaging/packages/ffmpegthumbs/-/issues/1,
per packager request.

SUMMARY

Previously with `ffmpegthumbs` installed, I was able to see thumbnails for all
supported video files on my various disks in Dolphin. However, after I did a
system update today which updated all KDE frameworks related packages to 6.1, I
noticed that the videos within my plasma vault (which is backed by gocryptfs)
are no longer showing thumbnails. Video files on other filesystems are not
affected.

Things I've tried:

- Reboot. No change in behaviour.
- Reinstalling `ffmpegthumbs`. No change in behaviour.
- Create a symlink on a "regular" file system to the video within gocryptfs.
Thumbnail does not show.
- Copy the video within gocryptfs to a "regular" file system. Thumbnail shows
correctly.
- Create a symlink within gocryptfs to a video on a "regular" file system.
Thumbnail shows correctly.
- Launch Dolphin from a terminal. No noteworthy logs.

STEPS TO REPRODUCE

1. Prepare a video file, MP4 or anything that's supported.
2. Observe that in a "normal" file system like exfat, ext4, or btrfs, Dolphin
shows the video thumbnail correctly.
3. Create a plasma vault backed by gocryptfs, and copy the video file into it.
4. Observe that Dolphin does not show the thumbnail of this video file.
5. If possible, find a machine that is still on KDE frameworks 6.0. Observe
that this problem does not exist.

SOFTWARE/OS VERSIONS

- Kernel: 6.8.2.arch1-1
- KDE Plasma: 6.0.3
- KDE Frameworks: 6.1.0
- QT: 6.7.0

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