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$ mythfrontend
libEGL warning: DRI2: failed to authenticate
"Display: Requesting EGL for 'Mesa Project, 1.4'"
libEGL warning: DRI2: failed to authenticate
2020-11-14 16:24:39.233901 I Setup Interrupt handler
2020-11-14 16:24:39.233917 I Setup Terminated handler
2020-11-14 16:24:39.233921 I Setup Segmentation fault handler
2020-11-14 16:24:39.233928 I Setup Aborted handler
2020-11-14 16:24:39.233931 I Setup Bus error handler
2020-11-14 16:24:39.233936 I Setup Floating point exception handler
2020-11-14 16:24:39.233940 I Setup Illegal instruction handler
2020-11-14 16:24:39.233946 I Setup Real-time signal 0 handler
2020-11-14 16:24:39.233950 I Setup User defined signal 1 handler
2020-11-14 16:24:39.233955 I Setup User defined signal 2 handler
2020-11-14 16:24:39.233959 I Setup Hangup handler
2020-11-14 16:24:39.234017 C mythfrontend version: fixes/31 [v31.0-118-geb3c84de5f] www.mythtv.org
2020-11-14 16:24:39.234020 C Qt version: compile: 5.9.5, runtime: 5.9.5
2020-11-14 16:24:39.234049 I Ubuntu 18.04.5 LTS (x86_64)
2020-11-14 16:24:39.234051 N Enabled verbose msgs: general
2020-11-14 16:24:39.234061 N Setting Log Level to LOG_INFO
2020-11-14 16:24:39.244423 N Using runtime prefix = /usr/local
2020-11-14 16:24:39.244428 N Using configuration directory = /home/pjr/.mythtv
2020-11-14 16:24:39.244474 I Assumed character encoding: en_GB.UTF-8
2020-11-14 16:24:39.244768 I Loading en_gb translation for module mythfrontend
2020-11-14 16:24:39.244935 I Empty LocalHostName. This is typical.
2020-11-14 16:24:39.244938 I Using a profile name of: 'atlast-vm3' (Usually the same as this host's name.)
2020-11-14 16:24:39.244985 I Start up testing connections. DB localhost, BE , attempt 0, status dbAwake, Delay: 2000
2020-11-14 16:24:39.245497 I Added logging to the console
2020-11-14 16:24:40.304170 N Setting QT default locale to en_GB
2020-11-14 16:24:40.304178 I Current locale en_GB
2020-11-14 16:24:40.304209 N Reading locale defaults from /usr/local/share/mythtv//locales/en_gb.xml
2020-11-14 16:24:40.311458 I Display: Found screen 'VGA-1'
2020-11-14 16:24:40.311471 I Display: Using screen 'VGA-1' (Make: Unknown Model: Unknown)
2020-11-14 16:24:40.311479 I Display: Qt screen pixel ratio: 1.00
2020-11-14 16:24:40.311489 I Display: Geometry: 1680x942+0+0 Size(Qt): 440mmx246mm
2020-11-14 16:24:40.314985 N Display: Desktop video mode: 1680x942 59.956Hz
2020-11-14 16:24:40.314990 N Display: Display is using sRGB colourspace
2020-11-14 16:24:40.322689 I ScreenSaverDBus: Created for DBus service: org.freedesktop.ScreenSaver
2020-11-14 16:24:40.323863 I ScreenSaverDBus: Created for DBus service: org.freedesktop.PowerManagement.Inhibit
2020-11-14 16:24:40.325927 I Starting process manager
2020-11-14 16:24:40.325949 I Starting process signal handler
2020-11-14 16:24:40.327802 I Starting IO manager (write)
2020-11-14 16:24:40.327862 I Starting IO manager (read)
2020-11-14 16:24:40.377924 I ScreenSaverX11Private: DPMS is active.
2020-11-14 16:24:40.439958 I PowerDBus: Added UPower.Device '/org/freedesktop/UPower/devices/line_power_AC'
2020-11-14 16:24:40.439966 I Power: Unknown power source
2020-11-14 16:24:40.460592 I Power: Supported actions: Suspend,Restart,Shutdown
2020-11-14 16:24:40.464014 I Listening on TCP 0.0.0.0:6547
2020-11-14 16:24:40.464635 I Listening on TCP [::]:6547
2020-11-14 16:24:43.138319 I Connecting to lcd server: 127.0.0.1:6545 (try 1 of 10)
2020-11-14 16:24:43.139567 I Loading en_gb translation for module mythfrontend
2020-11-14 16:24:43.168641 E LIRC: Failed to read config file '/home/pjr/.lircrc'
2020-11-14 16:24:43.168665 I No joystick configuration found, not enabling joystick control
2020-11-14 16:24:43.168669 I UDPListener: Enabling
2020-11-14 16:24:43.169399 I Binding to UDP 0.0.0.0:6948
2020-11-14 16:24:43.169433 I Binding to UDP [::]:6948
2020-11-14 16:24:43.212156 I Display: Have main widget
2020-11-14 16:24:43.215602 I UI Screen Resolution: 900 x 600
2020-11-14 16:24:43.243118 I Display: Have main window
2020-11-14 16:24:43.243936 I Display: Found screen 'VGA-1'
2020-11-14 16:24:43.261661 I OpenGL: OpenGL vendor : VMware, Inc.
2020-11-14 16:24:43.261667 I OpenGL: OpenGL renderer : llvmpipe (LLVM 10.0.0, 256 bits)
2020-11-14 16:24:43.261670 I OpenGL: OpenGL version : 3.1 Mesa 20.0.8
2020-11-14 16:24:43.261672 I OpenGL: Qt platform : xcb
2020-11-14 16:24:43.261705 I OpenGL: EGL display : Yes
2020-11-14 16:24:43.261707 I OpenGL: EGL images : Yes
2020-11-14 16:24:43.261709 I OpenGL: Qt OpenGL format : OpenGL 3.1
2020-11-14 16:24:43.261711 I OpenGL: Qt OpenGL surface : RGBA: 8880 Depth: 0 Stencil: 0
2020-11-14 16:24:43.261713 I OpenGL: Max texture size : 8192
2020-11-14 16:24:43.261715 I OpenGL: Max texture units : 128
2020-11-14 16:24:43.261717 I OpenGL: Shaders : Yes
2020-11-14 16:24:43.261719 I OpenGL: NPOT textures : Yes
2020-11-14 16:24:43.261724 I OpenGL: Multitexturing : Yes
2020-11-14 16:24:43.261727 I OpenGL: Rectangular textures : Yes
2020-11-14 16:24:43.261730 I OpenGL: Buffer mapping : Yes
2020-11-14 16:24:43.261732 I OpenGL: Framebuffer objects : Yes
2020-11-14 16:24:43.261736 I OpenGL: 16bit framebuffers : Yes
2020-11-14 16:24:43.261738 I OpenGL: Unpack Subimage : Yes
2020-11-14 16:24:43.261741 I OpenGL: GL_RED/GL_R8 : Yes
2020-11-14 16:24:43.277176 I OpenGL: Initialised MythRenderOpenGL
2020-11-14 16:24:43.277182 I OpenGL: Using full range output
2020-11-14 16:24:43.281801 I MythUIHelper: Pruning cache directory: /home/pjr/.mythtv/cache/remotecache
2020-11-14 16:24:43.281845 I MythUIHelper: Kept 0 files, deleted 0 files, stat error on 0 files
2020-11-14 16:24:43.281851 I MythUIHelper: Pruning cache directory: /home/pjr/.mythtv/cache/thumbnails
2020-11-14 16:24:43.281908 I MythUIHelper: Kept 7 files, deleted 0 files, stat error on 0 files
2020-11-14 16:24:43.460155 I MythCoreContext::ConnectCommandSocket(): Connecting to backend server: 127.0.0.1:6543 (try 1 of 1)
2020-11-14 16:24:43.461727 I MythCoreContext::CheckProtoVersion(): Using protocol version 91 BuzzOff
2020-11-14 16:24:43.578418 E CECAdapter: Failed to find any CEC devices.
Failed to open VDPAU backend libvdpau_nvidia.so: cannot open shared object file: No such file or directory
2020-11-14 16:24:44.080351 I CECAdapter: Closing down CEC.
2020-11-14 16:24:44.084522 E RAOP Device: Aborting startup - no key found.
2020-11-14 16:24:44.086757 I AirPlay: Created airplay objects.
2020-11-14 16:24:44.087184 I Listening on TCP 0.0.0.0:5100
2020-11-14 16:24:44.087276 I Listening on TCP [::]:5100
2020-11-14 16:24:44.104291 I Current MythTV Schema Version (DBSchemaVer): 1361
2020-11-14 16:24:44.109898 I VDPAUHelp: VDPAU is NOT available
2020-11-14 16:24:44.112844 I VAAPIDec: VAAPI functionality checked failed
2020-11-14 16:24:44.123802 E NVDECInterop: Failed to initialise CUDA API
2020-11-14 16:24:44.124238 I NVDEC: No NVDEC decoders found
2020-11-14 16:24:44.124609 I V4L2_M2M: No V4L2 decoders found
2020-11-14 16:24:44.468857 N Registering Internal as a media playback plugin.
2020-11-14 16:24:44.469993 N MediaMonitor disabled by user setting.
Segmentation fault (core dumped)
This on VirtualBox V5.2.34.iso system running ubuntu 18.04. Mythbackend seen to be running from System Monitor.
Note, V31 runtime requires libexiv2-27 which is not available on 18.04, libexiv2-14 is, so used that but that doesn't look like the problem. Got similar results several months ago so went to source build of v30 which all worked ok.
