Comment 3 for bug 612251

The same occurs with me, but there is no apport files into /var/crash, even with the crash interception component enabled:

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rodrigo@rf511:~$ brasero

(brasero:2760): GLib-CRITICAL **: 09:05:31.742: g_key_file_load_from_file: assertion 'file != NULL' failed

** (brasero:2760): WARNING **: 09:05:31.742: Could not establish a connection to Tracker: Failed to load SPARQL backend: Key file does not have group “DomainOntology”

(brasero:2760): Gtk-WARNING **: 09:05:46.799: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &
Xlib: extension "NV-GLX" missing on display ":0".

(brasero:2760): Gtk-WARNING **: 09:05:46.951: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &

(brasero:2760): Gtk-WARNING **: 09:05:46.951: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &

(brasero:2760): Gtk-WARNING **: 09:05:47.100: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &

(brasero:2760): Gtk-WARNING **: 09:05:47.103: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &

(brasero:2760): Gtk-WARNING **: 09:05:47.103: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &
Xlib: extension "NV-GLX" missing on display ":0".

** (brasero:2760): CRITICAL **: 09:05:47.420: brasero_track_type_equal: assertion 'type_B != NULL' failed

(brasero:2760): Gtk-WARNING **: 09:05:48.263: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &

(brasero:2760): Gtk-WARNING **: 09:05:48.264: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &

(brasero:2760): Gtk-WARNING **: 09:05:48.309: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &

(brasero:2760): Gtk-WARNING **: 09:05:48.310: Failed to set text from markup due to error parsing markup: Error on line 1: Entity did not end with a semicolon; most likely you used an ampersand character without intending to start an entity - escape ampersand as &
Gtk-Message: 09:06:03.751: GtkDialog mapped without a transient parent. This is discouraged.
Gtk-Message: 09:06:24.868: GtkDialog mapped without a transient parent. This is discouraged.
**ERROR: [brasero] Horizontal size is greater than permitted in specified Level
rodrigo@rf511:~$ ls /var/crash
rodrigo@rf511:~$
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I got only this log into /var/log/syslog:

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Aug 3 09:29:00 rf511 gnome-shell[1376]: [AppIndicatorSupport-DEBUG] Registering StatusNotifierItem :1.113/org/ayatana/NotificationItem/brasero
Aug 3 09:29:00 rf511 gnome-shell[1376]: Object .Gjs_AppIndicatorIconActor__1 (0x557ba3297c40), has been already finalized. Impossible to set any property to it.
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: == Stack trace for context 0x557ba0aa1340 ==
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #0 0x7ffe5f4fa780 I resource:///org/gnome/gjs/modules/_legacy.js:83 (0x7fdec83b5de0 @ 87)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #1 0x557ba0f2bae0 i /<email address hidden>/indicatorStatusIcon.js:93 (0x7fde782c7340 @ 58)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #2 0x7ffe5f4fb360 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7fdec83b5de0 @ 71)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #3 0x7ffe5f4fb420 b self-hosted:915 (0x7fdec83f12b8 @ 367)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #4 0x7ffe5f4fb510 b resource:///org/gnome/gjs/modules/signals.js:128 (0x7fdec83d3230 @ 386)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #5 0x557ba0f2ba58 i /<email address hidden>/appIndicator.js:190 (0x7fde782b2f78 @ 22)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #6 0x7ffe5f4fc160 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7fdec83b5de0 @ 71)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #7 0x557ba0f2b9b0 i /<email address hidden>/statusNotifierWatcher.js:176 (0x7fde782b22b8 @ 26)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #8 0x7ffe5f4fcd40 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7fdec83b5de0 @ 71)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #9 0x557ba0f2b910 i /<email address hidden>/statusNotifierWatcher.js:170 (0x7fde782b2230 @ 68)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #10 0x7ffe5f4fd930 I resource:///org/gnome/gjs/modules/_legacy.js:82 (0x7fdec83b5de0 @ 71)
Aug 3 09:29:00 rf511 org.gnome.Shell.desktop[1376]: #11 0x7ffe5f4fda00 b self-hosted:917 (0x7fdec83f12b8 @ 394)
Aug 3 09:29:00 rf511 gnome-shell[1376]: JS ERROR: TypeError: this._proxy is null#012DBusClient<._beginLayoutUpdate@/<email address hidden>/dbusMenu.js:292:9#012wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22#012DBusClient<._requestLayoutUpdate@/<email address hidden>/dbusMenu.js:233:13#012wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22#012DBusClient<._clientReady@/<email address hidden>/dbusMenu.js:368:9#012wrapper@resource:///org/gnome/gjs/modules/_legacy.js:82:22#012_makeProxyWrapper/</<@resource:///org/gnome/gjs/modules/overrides/Gio.js:191:21
Aug 3 09:29:00 rf511 gnome-shell[1376]: [AppIndicatorSupport-WARN] while calling AboutToShow: Gio.DBusError: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name :1.113 was not provided by any .service files
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I'm using Ubuntu 18.10 and Brasero 3.12.1:
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rodrigo@rf511:~$ uname -a
Linux rf511 4.15.0-29-generic #31-Ubuntu SMP Tue Jul 17 15:39:52 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
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Is there other thing that I can help you figure out the problem?

The steps that I've been executed:
1) execute '$ brasero';
2) create 'Video project';
3) add one or more mp4 files to the list;
4) clicked 'Burn...';
5) in "Video Options' I've checked 'Aspect Ratio = 16:9' instead '4:3';
5.1) the options checked are: Video Options > Video format = Native format; Video Options > Aspect ratio = 16:9; Burning speed = Maximum speed; Options > Use burnproof; Options > Simulate before burning; Temporary files > "/tmp".
6) clicked 'Burn';
7) Brasero stops working.

Thanks.