[kdemultimedia] [Bug 444064] New: ffmpegthumbs causes Dolphin to "hang" when viewing properties / details of video file on network share (CIFS/SMB)

[flan_suse]

https://bugs.kde.org/show_bug.cgi?id=444064

            Bug ID: 444064
           Summary: ffmpegthumbs causes Dolphin to "hang" when viewing
                    properties / details of video file on network share
                    (CIFS/SMB)
           Product: kdemultimedia
           Version: unspecified
          Platform: Manjaro
                OS: Linux
            Status: REPORTED
          Severity: crash
          Priority: NOR
         Component: ffmpegthumbs
          Assignee: unassigned-bugs at kde.org
          Reporter: windows2linux at zoho.com
  Target Milestone: ---

VERSION INFO:

ffmpegthumbs: 21.08.2

Operating System: Manjaro Linux

KDE Plasma Version: 5.22.5

KDE Frameworks Version: 5.87.0

Qt Version: 5.15.2

Kernel Version: 5.14.10-1-MANJARO (64-bit)

Graphics Platform: X11

Processors: 8 × 11th Gen Intel® Core™ i7-1165G7 @ 2.80GHz

Memory: 15.4 GiB of RAM

Graphics Processor: Mesa Intel Xe Graphics


---


All scenarios assume CIFS network share, SMB protocol version 3; mounted either
via manual mount, fstab, systemd unit, or Smb4K.



The following scenarios are *very likely* to make Dolphin "hang":

* Prerequisite: ffmpegthumbs is installed

* Prerequisite: Previews are enabled in Dolphin (video previews are enabled)



1. With Dolphin, browse to a CIFS network share

1a. Right-click a video file -> Properties



Result: Dolphin hangs for several seconds or more (unresponsive)

2. In Dolphin Browse to CIFS network share

2a. Enable the "Details" pane

2b. Click on a video file

Result: Dolphin hangs for several seconds or more (unresponsive)


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The following scenarios will *NOT* make Dolphin hang:

3. Repeat any of the above, however, use a LOCAL folder (rather than a network
share)

4. Repeat any of the above, however, use a READ-ONLY mounted network share
("ro")

5. Repeat any of the above, however DISABLE "Video File" previews (or uninstall
ffmpegthumbs)


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FURTHER NOTES:

This isn't 100% a consistent hang. Sometimes it will "just work", but I noticed
the majority of the time it hangs Dolphin.

Scenario #4 above is very peculiar. For some reason using the "ro" (read-only)
mount option on the CIFS network share alleviates the problem entirely!

In all the above scenarios, video thumbnails generate properly. The hang only
occurs when trying to view the file's properties (either via right-click ->
Properties, or by enabling the Details pane and clicking on the file.)


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I am going to prepare a video capture to show exactly what happens.

Any more information needed? Let me know what would be most useful.

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