[digikam] [Bug 372485] New: Video thumbnails not created on OS X (Linux works fine since 5.3)

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https://bugs.kde.org/show_bug.cgi?id=372485

            Bug ID: 372485
           Summary: Video thumbnails not created on OS X (Linux works fine
                    since 5.3)
           Product: digikam
           Version: 5.3.0
          Platform: Other
                OS: OS X
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: Thumbnails
          Assignee: [hidden email]
          Reporter: [hidden email]
  Target Milestone: ---

I installed the PKG on OS X 10.11.5 (and philip5's packages on Ubuntu 16.04
64bit) and video thumbnails only work on Linux. On OS X, no video thumbnails
are created.

Is this a known bug? If not, how can I get more detailed console output?

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--- Comment #1 from [hidden email] ---
It's not

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--- Comment #2 from [hidden email] ---
It's not a bug, it's a limitation of Qt5::Multimedia under OSX and Windows,
which cannot do extract video frames.

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--- Comment #3 from [hidden email] ---
Alternative to process video frame extraction can be done with OpenCV library,
also used by digiKam :

http://stackoverflow.com/questions/30800772/how-to-grab-video-frames-in-qt

Gilles Caulier

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--- Comment #4 from Jens <[hidden email]> ---
OK thank you :) do you have any plans to do this in the near future?

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--- Comment #5 from [hidden email] ---
It's diffcult to judge, but at least we can give a clear state:

1/ Qt5::Multimedia framework do not give the same results on OSX and Windows
compared to Linux.
2/ Qt5::Multimedia framework under Linux use GStreamer codec in background
under Linux, which is a huge pain for end users. GStreamer is insoluble puzzle
with a lots of run-time dependencies. I tried to bundle it in AppImage for
5.3.0. Result, i lost one week only on this topic. This do not work !
3/ Qt5::Multimedia framework under OSX and Windows require extra codec. Why???
4/ Possible solution is to use ffmpeg backend + a Qt5 interface. Some project
already exist but are complex or not finalized or use OpenGL for video. OPenGL
is another pain, especialy uner Linux. So not at all...
5/ Another solution is OpenCV. But i'm not yet sure about the low level backend
used to decode video. OpenCV is another big puzzle, complex to solve.
6/ Write a Qt5::framework plugin to use ffmpeg. I don't found something
somewhere yet on the web... This will be my preferred way, but it's require
investigation and time.

Gilles Caulier

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--- Comment #6 from [hidden email] ---
*** Bug 370228 has been marked as a duplicate of this bug. ***

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--- Comment #7 from Unknown <[hidden email]> ---
Git commit 32ebb7dff83b03cfad91cbe89de252b1f62bdd6e by Gilles Caulier.
Committed on 11/12/2016 at 12:02.
Pushed by cgilles into branch 'master'.

digiKam embeded mediaplayer is now based on QtAV/ffmpeg instead Qt5Multimedia.

TODO:

- handle video rotation flag with new Exiv2 0.26 to autorotate media in player.
- port video thumbnailer to QtAV.
- port Presentation audio player to QtAV.
- remove Qt5Multimedia dependency.

For later:

- play video into slideshow tool.
- port old videoslideshow tool to QtAv
Related: bug 373272, bug 271751, bug 361829, bug 159824, bug 329854

M  +12   -6    CMakeLists.txt
M  +3    -2    app/CMakeLists.txt
M  +40   -38   app/views/mediaplayerview.cpp
M  +11   -8    app/views/mediaplayerview.h

https://commits.kde.org/digikam/32ebb7dff83b03cfad91cbe89de252b1f62bdd6e

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--- Comment #8 from Unknown <[hidden email]> ---
Git commit ec50a8ad510e9fe6ded53f0632afd4ffbdf8ba47 by Gilles Caulier.
Committed on 11/12/2016 at 16:37.
Pushed by cgilles into branch 'master'.

digiKam port to QtAV/ffmpeg instead Qt5Multimedia : port Presentation audio
player to QtAV.

TODO:

- handle video rotation flag with new Exiv2 0.26 to autorotate media in player.
- port video thumbnailer to QtAV.
- remove Qt5Multimedia dependency.

For later:

- play video into slideshow tool.
- port old videoslideshow tool to QtAv.
Related: bug 271751, bug 361829, bug 159824, bug 329854

M  +4    -5    app/CMakeLists.txt
M  +1    -1    app/views/mediaplayerview.cpp
M  +2    -2    app/views/mediaplayerview.h
M  +1    -5    utilities/presentation/CMakeLists.txt
M  +34   -24   utilities/presentation/audio/presentationaudiolist.cpp
M  +8    -5    utilities/presentation/audio/presentationaudiolist.h
M  +45   -27   utilities/presentation/audio/presentationaudiowidget.cpp
M  +9    -5    utilities/presentation/audio/presentationaudiowidget.h

https://commits.kde.org/digikam/ec50a8ad510e9fe6ded53f0632afd4ffbdf8ba47

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--- Comment #9 from Unknown <[hidden email]> ---
Git commit 193ecfd91745aab81c15ccf1a3889dc033ee7917 by Gilles Caulier.
Committed on 11/12/2016 at 21:09.
Pushed by cgilles into branch 'master'.

digiKam port to QtAV/ffmpeg instead Qt5Multimedia : add video support into
Slideshow.

TODO:

- handle video rotation flag with new Exiv2 0.26 to autorotate media in player.
- port video thumbnailer to QtAV.
- remove Qt5Multimedia dependency.

For later:

- port old videoslideshow tool to QtAv.
Related: bug 159824, bug 271751, bug 361829, bug 329854
FIXED-IN: 5.4.0

M  +8    -6    NEWS
M  +3    -3    app/views/mediaplayerview.cpp
M  +1    -1    app/views/mediaplayerview.h
M  +1    -0    utilities/slideshow/CMakeLists.txt
M  +68   -5    utilities/slideshow/slideshow.cpp
M  +3    -0    utilities/slideshow/slideshow.h
A  +227  -0    utilities/slideshow/slidevideo.cpp     [License: GPL (v2+)]
C  +16   -51   utilities/slideshow/slidevideo.h [from:
app/views/mediaplayerview.h - 050% similarity]

https://commits.kde.org/digikam/193ecfd91745aab81c15ccf1a3889dc033ee7917

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           What    |Removed                     |Added
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             Status|UNCONFIRMED                 |RESOLVED
         Resolution|---                         |FIXED
   Version Fixed In|                            |5.4.0

--- Comment #10 from [hidden email] ---
Next digiKam 5.4.0 will support de facto video format through QtAV framework,
without to install extra video codec. We remove Qt5::Multimedia dependency in
digiKam.

Video thumbnails in action under MacOSX :

https://www.flickr.com/photos/digikam/31679362466/in/dateposted-public/

Gilles Caulier

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

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