[Bug 789473] vaapi plugins removed from registry at early boot

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=789473

--- Comment #4 from Florent Thiéry <florent.thiery at ubicast.eu> ---
I'm a bit confused by the results.

$ cat /usr/local/bin/debugvaapi.sh
#!/bin/bash
rm -rf /home/ubicast/.cache/gstreamer-1.0/
GST_DEBUG_NO_COLOR=yes GST_DEBUG=vaapi*:7 /usr/bin/gst-inspect-1.0 vaapih264enc
&> /home/ubicast/vaapi.txt

Running it manually produces the expected result (user.log).

Running it from systemd with the following unit file (in
/usr/lib/systemd/system/vaapidebug.service) doesn't print any vaapi related
lines, just "No such element or plugin 'vaapih264enc' (along with some
warnings, see systemd.log):

$ cat /usr/lib/systemd/system/vaapidebug.service
[Unit]
Description=Debug vaapi

[Service]
ExecStart=/usr/local/bin/debugvaapi.sh
User=ubicast

[Install]
WantedBy=multi-user.target

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