Hi.
I had the same issue, and at least for me it was kind of a gstreamer bug:
Short version: install gstreamer1.0-libav, and possibly remove
gstreamer1.0-plugins-bad to get rid of 'eglglessink' which might get
incorrectly used for video output.
Long story:
First, gstreamer1.0-libav was missing (a post in the Arch Linux forum
tipped me off [1]).
After installing this package (from testing), a preview, i.e., the first
frame of the video, was shown for videos inserted on a slide.
However, playback did not work yet - there was just a white empty window,
and Libreoffice locked up.
LibreOffice uses the gstreamer 'playbin' module(?), which offers an easy
way to play media files.
One can also run it as follows:
gst-launch-1.0 playbin uri=file:///path/to/vid.webm
However, this command failed for me, giving an error message about EGL and
no access to DRM2.
Theoretically, playbin should automatically select the best video output
(e.g., Xvideo), as documented in [2]:
"By default, if no audio sink or video sink has been specified via the
"audio-sink" or "video-sink" property, playbin will use the
autoaudiosink and autovideosink elements to find the first-best
available output method. "
This was apparently not entirely correct, as playbin automatically used
'eglglessink' - which was the first video sink listed when running
'gst-inspect-1.0'. However, as my desktop system does not support EGL, no
video was output.
Strangely, the explicitly setting 'autovideosink' as the video sink
correctly selects xvimagesink as video output:
gst-launch-1.0 playbin uri=file:///path/to/vid.webm
video-sink=autovideosink
This is either a bug in gstreamer or misconfiguration in my gstreamer
setup.
There is no way of selecting the video sink for LibreOffice playback
without changing the source code.
Therefore, I resorted to removing package gstreamer1.0-plugins-bad which
contains 'eglglessink'.
Video playback in LibreOffice worked afterwards.
Can anyone confirm this?
Best,
Raphael
[1] https://bbs.archlinux.org/viewtopic.php?id=165774
[2]
http://www.freedesktop.org/software/gstreamer-sdk/data/docs/latest/gst-plugins-base-plugins-0.10/gst-plugins-base-plugins-playbin2.html
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