[digikam] [Bug 357972] New: Video Thumbnails are not produced anymore

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https://bugs.kde.org/show_bug.cgi?id=357972

            Bug ID: 357972
           Summary: Video Thumbnails are not produced anymore
           Product: digikam
           Version: 4.14.0
          Platform: Archlinux Packages
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Thumbnails
          Assignee: [hidden email]
          Reporter: [hidden email]

I noticed a while ago ( two months ) that DigiKam did not mark the video clips
with the usual "Filmstrip" effect. Now ( 2016-01 ) the thumbnails are just not
produced at all.


Reproducible: Always

Steps to Reproduce:
1. Save film clips in a directory
2. Point DigiKam at the directory
3. Watch the mplayer process chew away at the clips for a while
4. No update on the thumbnails in the icons

Actual Results:  
Icons are not converted into thumbnails of the clips.

Expected Results:  
Thumbnails, with the usual filmstrip effects

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--- Comment #1 from Evert Vorster <[hidden email]> ---
Created attachment 96631
  --> https://bugs.kde.org/attachment.cgi?id=96631&action=edit
Screenshot showing the problem

Screenshot, showing the problem, together with a dolphin view of the same
directory, with the proper thumbnails.

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Maik Qualmann <[hidden email]> changed:

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--- Comment #2 from Maik Qualmann <[hidden email]> ---
From README:

digiKam do not have any video thumbnailer. Video support is delegate to KDE. To
support Video thumbnails,  please install "ffmpegthumbs" package, which is the
kdemultimedia Video thumbnail generator for KDE4 file managers.

Your thumbnails in Dolphin could be loaded from the cache. Appear new video
thumbnails in Dolphin?

Maik

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--- Comment #3 from Evert Vorster <[hidden email]> ---
ffmpegthumbs package is installed.
Dolphin is creating the thumbnails on demand, as I was watching it read the
files and pop the thumbnails in over time.

I'm thinking that this may be more of an Arch issue, as Arch is moving over to
QT5, and digikam used to work until a recent system upgrade.

I am now installing DigiKam 5.0.0 from git.

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--- Comment #4 from [hidden email] ---
exactly.

Dolphin use Desktop standard cache mechanism (PNG thumb file stored in your
home dir).

DK do not use this mechanism since a while, but a dedicated database to
optimize a lots the space used to store thumbs (wavelets compression) and to be
able to show thumbs with disconnected media managed with DK.

In Dolphin, press F5 to refresh video thumbs. Does it work ?

Note : DK and Dolphin share the same engine to extract video thumbs. Engine is
provided by KDELibs (as an interface), which use a low level extractor as
mplayer (configurable in KDE control panel)

Maik : the video thumb handling is a big mess in KDE and very sensible to
system update and settings. With Qt5, we will wait a method to be able to
extract video thumb with QtMultimedia. As i know this still in TODO list for Qt
team : see on bottom of https://wiki.qt.io/Qt_Multimedia

Gilles Caulier

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--- Comment #5 from Evert Vorster <[hidden email]> ---
When I first navigate to the directory, the thumbnails are generated on demand
by Dolphin.
The video files are 3.5Gb each, so this takes a little while.

If I then hit f5, I can see the icons instantly refresh, so there must be some
caching going on.

When I hit F5 on the directory in DigiKam, I can see the mlayer process start
up, and chew through the files, but for some reason the icons are not updated.

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--- Comment #6 from [hidden email] ---
DK has a dedicated DB file named thumbnails-digikam.db.

Remove or rename it (it's safe) and restart DK. It's safe : DB file only
contain wavelets compressed files, no other data.

Gilles Caulier

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--- Comment #7 from Evert Vorster <[hidden email]> ---
Hi there.

I tried removing the thumbnails-digikam.db file, and DigiKam did not re-create
the missing thumbnails.

I did notice that DigiKam 5.0.0 makes the thumbnails properly.
I encoded all the extra metadata into my images directly, so I am going to
start with a clean database on DK 5.0.0

Like I said, Arch is moving away from QT4, so things using it are going to
start breaking. I'll just use DK 5.0.0 from git until it's a stable package in
Arch.

Thanks for looking into this, but I think we can close this bug.

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[hidden email] changed:

           What    |Removed                     |Added
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         Resolution|---                         |FIXED
   Version Fixed In|                            |5.0.0
             Status|UNCONFIRMED                 |RESOLVED

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           What    |Removed                     |Added
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          Component|Thumbs-Image                |Thumbs-Video

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