[Bug 777059] Wayland session login freezes with EasyScreenCast GNOME Shell extension

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=777059

--- Comment #4 from Francisco de la Peña <fran at fran.cr> ---
> It is hard to figure out what is happening with no means to trace the problem.

Unfortunately, yes. I tried with GST_DEBUG_FILE in /etc/profile.d/ to catch
these lines, but only X session writes stuff because it does not crash with it.

> I don't now follow these lines. What do you mean?

The EasyScreenCast extension initializes on session startup and writes some
output to the GST_DEBUG_FILE. When I remove the libva-*-driver file, it still
freezes in the Wayland session in the same way and writes nothing there. In the
X session the extension still loads as usual and it writes this in the log,
where it shows the same first couple of function calls:

0:00:00.005270151  7301 0x55fcd4b93d30 INFO                   vaapi
gstvaapidisplay.c:120:libgstvaapi_init_once: gstreamer-vaapi version 
0:00:00.011254250  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapidisplay.c:802:gst_vaapi_display_calculate_pixel_aspect_ratio:
calculated pixel aspect ratio: 0.999820
0:00:00.011690649  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapiutils.c:53:vaapi_check_status: vaInitialize(): unknown libva error
0:00:00.015378077  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapidisplay.c:802:gst_vaapi_display_calculate_pixel_aspect_ratio:
calculated pixel aspect ratio: 0.999820
0:00:00.015678702  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapiutils.c:53:vaapi_check_status: vaInitialize(): unknown libva error
0:00:00.016429171  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapidisplay.c:802:gst_vaapi_display_calculate_pixel_aspect_ratio:
calculated pixel aspect ratio: 1.000000
0:00:00.016574501  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapiutils.c:53:vaapi_check_status: vaInitialize(): unknown libva error
0:00:00.017145166  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapidisplay.c:802:gst_vaapi_display_calculate_pixel_aspect_ratio:
calculated pixel aspect ratio: 1.000000
0:00:00.017561418  7301 0x55fcd4b93d30 DEBUG                  vaapi
gstvaapiutils.c:53:vaapi_check_status: vaInitialize(): unknown libva error
0:00:00.017585610  7301 0x55fcd4b93d30 ERROR                default
gstvaapi.c:234:plugin_init: Cannot create a VA display

journalctl does not catch any relevant line neither. Maybe is still a Wayland
or GNOME Shell issue, I'm going to retry the next week to get more details. In
any case this issue is easy to reproduce by following the mentioned steps if
anyone want to take a try.

Other gst based apps such totem work properly in my hardware with Wayland and
libva.

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