Bug 134877 - No media files played in downloaded Impress presentation with webM in GTK3
Summary: No media files played in downloaded Impress presentation with webM in GTK3
Status: NEW
Alias: None
Product: LibreOffice
Classification: Unclassified
Component: Impress (show other bugs)
(earliest affected) release
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Not Assigned
Depends on:
Blocks: Media-Playback
  Show dependency treegraph
Reported: 2020-07-16 17:06 UTC by r4dh4l
Modified: 2021-08-20 10:56 UTC (History)
2 users (show)

See Also:
Crash report or crash signature:

One slide impress presentation with an embedded WebM video. (4.92 MB, application/vnd.oasis.opendocument.presentation)
2021-06-13 21:18 UTC, r4dh4l

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Description r4dh4l 2020-07-16 17:06:45 UTC
I use Impress presentations with embedded media files (audio and video) for online lectures very often. I let my audience download the files because I use audio/video conference systems like Mumble without screen sharing. Unfortunately a lot of users reported that slides with embedded media files didn't play the audio or video content. As far as I understood...

- https://ask.libreoffice.org/en/question/200165/audio-fails-to-launch-when-copied-to-another-computer/
- https://ask.libreoffice.org/en/question/854/what-video-formats-does-libreoffice-impress-support/

...LibreOffice impress media files are only played if the operation system supports the embedded file format. I don't think that this is really the case because a presentation with media files created under Debian GNU/Linux is not properly played in a Linux Mint system although the used media files were played on the Linux Mint system.

However: Thank you very much for Libre Office!
Comment 1 Buovjaga 2020-12-14 06:40:57 UTC
Please attach an example document.
Change back to UNCONFIRMED after you have provided the document.
Comment 2 QA Administrators 2021-06-13 03:49:18 UTC Comment hidden (obsolete)
Comment 3 r4dh4l 2021-06-13 21:18:51 UTC
Created attachment 172848 [details]
One slide impress presentation with an embedded WebM video.

The attached one slide impress presentation with an embedded WebM video was created under Debian 10.9 and LO ("source system"). After transferring this presentation to a Linux Mint 19.3 system with LO ("target system") the video in the presentation is not visible, just the sound of the video is hearable.

If I play just the embedded video file on the "target system" the video content is visible and hearable so the target system is able to play the video.
Comment 4 QA Administrators 2021-06-14 03:41:43 UTC Comment hidden (obsolete)
Comment 5 Timur 2021-08-20 10:47:09 UTC
No repro Win. 
Repro 6.1 master, no repro 6.2 and 6.3 master and 6.4 oldest (ODS open and webM fine), somewhat repro 6.4 master (ODS opens black but webM runs OK) and 7.3+ (as in 6.4) Linux Mint 19 GTK3. No repro with GEN and SKIA.
Not sure if regression in GTK3 or just some flopping.
I tried bibisect in 6.4 but with no success. I considered black screen already when prez is opened as repro. But still runs video in 6.4 so I guess that spoiled it. 
Someone else may also try.