Bug 356348

(In reply to phillip9001 from comment #0)
> Plugins installed: mplayerthumbs, ffmpegthumbs, kffpmegthumbnailer,
> kdegraphics-thumbnailers, ffmpegthumbnailer.
> 
> The thumbnail previews of various container videos (e.g., flv, mpeg, mkv,
> and avi) in dolphin do appear, when "Preview" mode is active or when you
> mouse over the files. However, with HEVC (high efficiency video codec) video
> files the previews do not appear on the files nor when you mouse over the
> icons. In the preview panel, you can still play the HEVC video files without
> any hindrances, but the preview thumbnails or icons are still missing in
> Preview panel.
> 
> Reproducible: Always
> 
> Steps to Reproduce:
> 1. Install the following plugins/codecs: mplayerthumbs, ffmpegthumbs,
> kffpmegthumbnailer, kdegraphics-thumbnailers, and ffmpegthumbnailer.
> 2. Activate the plugins/codecs in the "Settings" tab and under
> "Preferences". 
> 3. View HEVC video files in the local drives (via Dolphin 4.14.2), with
> "Preview" and "Preview Panel" activated.
> 
> Actual Results:  
> The thumbnail previews of various container videos (e.g., flv, mpeg, mkv,
> and avi) in dolphin do show even when you mouse over the files. However,
> with HEVC (high efficiency video codec) video files the previews do not
> appear on the files nor when you mouse over the icons. In the preview panel,
> you can still play the HEVC video files without any hindrances. 
> 
> 
> I'm just curious if I'm missing any plugins or codecs that is necessary to
> view HEVC video file thumbnails and previews. If not, then it might be a bug
> or missing feature which I think should be remedied now that HEVC is
> starting to become more common. If you need more information or require
> anything on my end, please don't hesitate to ask.

My system specs are:

Linux Mint 17.1 Rebecca x86_64 (KDE), kernel 3.16.7, HP g6-2235us laptop, A10-4600M APU, 8 GB of RAM, 750 GB HDD.

Which mime type or file extension do these unsupported files have?

Maybe - Libraries don't support HEVC ?

A quick test - with an older Ubuntu: 

$ lsb_release -a
Distributor ID: Ubuntu
Description:    Ubuntu 14.04.3 LTS
Release:        14.04
Codename:       trusty

$ kde4-config --version
Qt: 4.8.6
KDE Development Platform: 4.13.3

Standard Ubuntu repository thumbnailer - using libav
$ apt-cache policy ffmpegthumbs
ffmpegthumbs:
  Installed: 4:4.13.3-0ubuntu0.1
  Candidate: 4:4.13.3-0ubuntu0.1

Local build - using ffmpeg - not Ubuntu repository libav
$ apt-cache policy kde-thumbnailer-ffmpeg-real-thumbs-mattepaint
kde-thumbnailer-ffmpeg-real-thumbs-mattepaint:
  Installed: 0.4~trusty~ppa3
  Candidate: 0.4~trusty~ppa3

  
Sample file: https://x265.com/hevc-video-files/ -> https://s3.amazonaws.com/x265.org/video/Tears_400_x265.mp4


The stamdard Ubuntu repository thumbnailer: http://imgur.com/KWy29Gl

Local build: http://imgur.com/BNT6pCp

Maybe - Libraries are too old, don't support HEVC ?

(In reply to Christoph Feck from comment #2)
> Which mime type or file extension do these unsupported files have?

The HEVC files are both mp4 and mkv containers.
I hope that is what you were referring to.
Let me know if you need anymore information.

(In reply to Rog131 from comment #3)
> Maybe - Libraries don't support HEVC ?
> 
> A quick test - with an older Ubuntu: 
> 
> $ lsb_release -a
> Distributor ID: Ubuntu
> Description:    Ubuntu 14.04.3 LTS
> Release:        14.04
> Codename:       trusty
> 
> $ kde4-config --version
> Qt: 4.8.6
> KDE Development Platform: 4.13.3
> 
> Standard Ubuntu repository thumbnailer - using libav
> $ apt-cache policy ffmpegthumbs
> ffmpegthumbs:
>   Installed: 4:4.13.3-0ubuntu0.1
>   Candidate: 4:4.13.3-0ubuntu0.1
> 
> Local build - using ffmpeg - not Ubuntu repository libav
> $ apt-cache policy kde-thumbnailer-ffmpeg-real-thumbs-mattepaint
> kde-thumbnailer-ffmpeg-real-thumbs-mattepaint:
>   Installed: 0.4~trusty~ppa3
>   Candidate: 0.4~trusty~ppa3
> 
>   
> Sample file: https://x265.com/hevc-video-files/ ->
> https://s3.amazonaws.com/x265.org/video/Tears_400_x265.mp4
> 
> 
> The stamdard Ubuntu repository thumbnailer: http://imgur.com/KWy29Gl
> 
> Local build: http://imgur.com/BNT6pCp
> 
> Maybe - Libraries are too old, don't support HEVC ?


I take it that KDE 4.14.2 doesn't have the necessary libraries to preview HEVC in dolphin? 
Does that mean I should update my libraries or try updating KDE Plasma 4 to Plasma 5?
Does this problem occur in KDE Plasma 5?

(In reply to phillip9001 from comment #5)

> I take it that KDE 4.14.2 doesn't have the necessary libraries to preview
> HEVC in dolphin? 
> Does that mean I should update my libraries or try updating KDE Plasma 4 to
> Plasma 5?
> Does this problem occur in KDE Plasma 5?

It is not the KDE libraries - It is the libav/ffmpeg libraries.

Short : The Debian & Ubuntu decided to use the ffmpeg fork libav /1/. The Ubuntu 14.04 is using libav 9.18 /2/. Ubuntu has a stable release policy /3/ to not update old packages. There will be bug fixes for the serious bugs.

When I was using the Ubuntu 14.04 I added the HEVC support to the KDE thumbnailer by:

- compiling an own local version of the current ffmpeg
- rebuilding the ffmpegthumbs so it is using the local ffmpeg not the distro libav.

By my knowledge the Mint /4/ is using the Ubuntu packages but I don't know witch version is using the newest released version.

With the Ubuntu KF5 thumbnailer there is the bug: https://bugs.launchpad.net/ubuntu/+source/dolphin/+bug/1505014 


1. https://www.kubuntuforums.net/showthread.php?62882-Avconv-Winff-ffmpeg
2. http://packages.ubuntu.com/source/trusty-updates/libav
3. https://wiki.ubuntu.com/StableReleaseUpdates
4. https://en.wikipedia.org/wiki/Linux_Mint