Bug 432837

Summary:	Thumbnails not generated when browsing network shares, ex. "smb://server/pictures/directory/1"
Product:	[Applications] dolphin	Reporter:	dermeyer
Component:	general	Assignee:	Dolphin Bug Assignee <dolphin-bugs-null>
Status:	CONFIRMED ---
Severity:	minor	CC:	dermeyer, kfm-devel, nate
Priority:	NOR
Version:	19.12.3
Target Milestone:	---
Platform:	Ubuntu
OS:	Linux
Latest Commit:		Version Fixed In:
Sentry Crash Report:
Attachments:	Screenshot_20210212_224207.png Screenshot_20210212_224356.png

Description dermeyer 2021-02-12 09:15:08 UTC

SUMMARY

Using Gwenview on Kubuntu 20.04 always the following effect occurs: Opening a shared network directory (pretty fast) containing mixed raw pictures like Nikon NEF and Panasonic RW2 files, only the thumbnails of NEF files are shown, for RW2 files I get no thumbnails but I can open them with Gwenview. The interesting thing is: If i copy such a Panasonic RW2 file to my local desktop directory I get instantly a preview with Gwenview, copying the same file back to a network share makes it again impossible to view a thumbnail of it. Because of the file-size I can attach a Panasonic RW2-file 

STEPS TO REPRODUCE
1. opening a network share folder with Panasonic RW2 files:  No thumbnails of these files
2. opening a local copy of this folder: Preview works
3. copying the local folder back to a network share, preview ability for RW2 files is lost again

.... this is reproduceable in different Linux distributions like Mint-Mate etc.

... and thanks a lot for the great work !!, regards Matthias


SOFTWARE/OS VERSIONS
Windows: 
macOS: 
Linux/KDE Plasma: Linux (x86_64) release 5.8.0-43-generic
(available in About System)
KDE Plasma Version: 5.18.5
KDE Frameworks Version: 5.68.0
Qt Version: 5.12.8

ADDITIONAL INFORMATION

Comment 1 Nate Graham 2021-02-12 18:01:49 UTC

Might be the same underlying issue as Bug 432628.

Questions for you:
1. What is the approximate filesize of the images that don't show previews?
2. What is the preview filesize limit set in Dolphin > Settings window > Previews > skip previews for remote files above:
3. In the file ~/.config/kdeglobals, what is listed under [PreviewSettings]?

Comment 2 dermeyer 2021-02-12 22:06:14 UTC

Created attachment 135646 [details]
Screenshot_20210212_224207.png

Hello Nate, thank you for your fast reply.
first of all here are the answers to your questions:

1.
approximate filesize is round about 23 mb
2.
The previewfilesize settings have been set to 0 mb, but even if I change
the value to 30 mb it does not work. (the filesize of Nikon NEFs is
round about 30 mb and they are allways visible)
3.
[PreviewSettings]
MaximumRemoteSize=0

But now something interesting (interesting to me). I installed Nemo
filemanager because of it's GVFS support AND if i connect with Nemo to
the network directory and use afterwards the GVFS path in Gwenview to
navigate to the folder I get the RW2 thumbnails (see 2 attached
screenshots and switch between them several times, it is really
interesting whats happening with all the thumbnails, and look for the
path ...) Unfortunately browsing with GVFS paths through my network
picture directories is much much slower than using smb shares.

Once again, thank you very much for dealing with my small problem,
regards, Matthias






Am 12.02.21 um 19:01 schrieb Nate Graham:
> https://bugs.kde.org/show_bug.cgi?id=432837
>
> Nate Graham <nate@kde.org> changed:
>
>             What    |Removed                     |Added
> ----------------------------------------------------------------------------
>           Resolution|---                         |WAITINGFORINFO
>                   CC|                            |nate@kde.org
>               Status|REPORTED                    |NEEDSINFO
>
> --- Comment #1 from Nate Graham <nate@kde.org> ---
> Might be the same underlying issue as Bug 432628.
>
> Questions for you:
> 1. What is the approximate filesize of the images that don't show previews?
> 2. What is the preview filesize limit set in Dolphin > Settings window >
> Previews > skip previews for remote files above:
> 3. In the file ~/.config/kdeglobals, what is listed under [PreviewSettings]?
>

Comment 3 dermeyer 2021-02-12 22:06:14 UTC

Created attachment 135647 [details]
Screenshot_20210212_224356.png

Comment 4 Nate Graham 2021-02-16 16:53:20 UTC

It looks like connecting to the share using Nemo caused Nemo to generate thumbnail previews. Since the thumbnails are cross/app/cross DE, Gwenview knows how to access them, once they exist. So it looks like the bug is in Dolphin not generating these thumbnails itself when you use it to browse the folder, despite the fact that your settings appear to be set up for it.