Me voilà de retour,
J'ai réinstallé f28 en conservant mon home: problème toujours présent.
J'ai créé un autre utilisateur: idem
J'ai essayé de démarrer avec sudo, ce que K3b n'aime pas du tout: idem
J'ai essayé avec d'autres fichiers, vidéo, mp3, texte: même résultat.
en démarrant en ligne de commande voilà ce que ça donne pour Brasero:
[jeanmaur@pc31 ~]$ brasero
(brasero:3265): Gtk-WARNING **: 16:22:37.793: Theme parsing error: gtk.css:3055:56: '/*' in comment block
Fontconfig error: "/home/jeanmaur/.config/fontconfig/fonts.conf", line 1540: no element found
(brasero:3265): GLib-GObject-WARNING **: 16:22:49.575: attempting to add an interface (EggTreeMultiDragSource) to class (GtkFileSystemModel) after class_init
(brasero:3265): GLib-GObject-WARNING **: 16:22:51.111: attempting to add an interface (EggTreeMultiDragSource) to class (GtkFileSystemModel) after class_init
(brasero:3265): GLib-GObject-WARNING **: 16:22:53.333: attempting to add an interface (EggTreeMultiDragSource) to class (GtkFileSystemModel) after class_init
(brasero:3265): GLib-GObject-WARNING **: 16:22:54.570: attempting to add an interface (EggTreeMultiDragSource) to class (GtkFileSystemModel) after class_init
(brasero:3265): GLib-GObject-WARNING **: 16:22:55.259: attempting to add an interface (EggTreeMultiDragSource) to class (GtkFileSystemModel) after class_init
(brasero:3265): GLib-CRITICAL **: 16:22:59.022: Source ID 3359 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:22:59.186: Source ID 3358 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:22:59.529: Source ID 3467 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:22:59.625: Source ID 3419 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:23:00.285: Source ID 3563 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:23:00.354: Source ID 3545 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:23:00.538: Source ID 3622 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:23:01.002: Source ID 3639 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:23:01.199: Source ID 3659 was not found when attempting to remove it
(brasero:3265): GLib-CRITICAL **: 16:23:01.273: Source ID 3724 was not found when attempting to remove it
Gtk-Message: 16:23:02.849: GtkDialog mapped without a transient parent. This is discouraged.
Gtk-Message: 16:23:05.464: GtkDialog mapped without a transient parent. This is discouraged.
et pour K3b voilà les infos de bébuggage :
Devices
-----------------------
TSSTcorp CDDVDW SE-208GB TS00 (/dev/sr0, CD-R, CD-RW, CD-ROM, DVD-ROM, DVD-R, DVD-RW, DVD-R DL, DVD+R, DVD+RW, DVD+R DL) [DVD-ROM, DVD-R séquentiel, DVD-R double couche séquentiel, DVD+R double couche avec saut, DVD-RAM, DVD-RW à ré-inscription limitée, DVD-RW séquentiel, DVD+RW, DVD+R, DVD+R double couche, CD-ROM, CD-R, CD-RW] [SAO, TAO, RAW, SAO/R96P, SAO/R96R, RAW/R16, RAW/R96P, RAW/R96R, Ré-inscription restreinte, Saut de couche] [%7]
System
-----------------------
K3b Version: 17.12.3
KDE Version: 5.44.0
Qt Version: 5.10.1
Kernel: 4.16.8-300.fc28.x86_64
Used versions
-----------------------
cdrecord: 1.1.11
cdrecord
-----------------------
/usr/bin/wodim: Operation not permitted. Warning: Cannot raise RLIMIT_MEMLOCK limits.
scsidev: '/dev/sr0'
devname: '/dev/sr0'
scsibus: -2 target: -2 lun: -2
/usr/bin/wodim: Cannot allocate memory.
Cannot open SCSI driver!
For possible targets try 'wodim --devices' or 'wodim -scanbus'.
For possible transport specifiers try 'wodim dev=help'.
For IDE/ATAPI devices configuration, see the file README.ATAPI.setup from
the wodim documentation.
Text len: 720
TOC Type: 0 = CD-DA
cdrecord command:
-----------------------
/usr/bin/wodim -v gracetime=2 dev=/dev/sr0 speed=24 -sao driveropts=burnfree textfile=/tmp/k3b.yMUnxg -useinfo -audio /tmp/k3b_audio_0_01.inf /tmp/k3b_audio_0_02.inf /tmp/k3b_audio_0_03.inf /tmp/k3b_audio_0_04.inf /tmp/k3b_audio_0_05.inf /tmp/k3b_audio_0_06.inf /tmp/k3b_audio_0_07.inf /tmp/k3b_audio_0_08.inf /tmp/k3b_audio_0_09.inf /tmp/k3b_audio_0_10.inf
et la sortie du terminal :
[jeanmaur@pc31 ~]$ k3b
(k3b:3448): Gtk-WARNING **: 16:24:47.106: Theme parsing error: gtk.css:3055:56: '/*' in comment block
Fontconfig error: "/home/jeanmaur/.config/fontconfig/fonts.conf", line 1540: no element found
Icon theme "gnome" not found.
Empty filename passed to function
(klauncher:3460): Gtk-WARNING **: 16:24:47.520: Theme parsing error: gtk.css:3055:56: '/*' in comment block
Connecting to deprecated signal QDBusConnectionInterface::serviceOwnerChanged(QString,QString,QString)
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
Empty filename passed to function
kf5.kio.core: "Le fichier ou le dossier /home/jeanmaur/VIDEOS CHINOISES n'existe pas."
Shortcut for action "project_burn" "&Graver" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
Shortcut for action "project_properties" "&Propriétés" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
Shortcut for action "track_remove" "Supprimer" set with QAction::setShortcut()! Use KActionCollection::setDefaultShortcut(s) instead.
kf5.kservice.services: KMimeTypeTrader: couldn't find service type "KParts/ReadOnlyPart"
Please ensure that the .desktop file for it is installed; then run kbuildsycoca5.
kf5.kio.kio_http: Can't communicate with kded_kcookiejar!
kf5.kio.kio_http: Can't communicate with kded_kcookiejar!
QObject::connect: No such signal KLineEdit::lostFocus()
QLayout: Attempting to add QLayout "" to QFrame "", which already has a layout
Couldn't start kuiserver from org.kde.kuiserver.service: QDBusError("org.freedesktop.DBus.Error.ServiceUnknown", "The name org.kde.kuiserver was not provided by any .service files")
QLayout: Attempting to add QLayout "" to K3b::EmptyDiscWaiter "", which already has a layout
QLayout: Attempting to add QLayout "" to K3b::EmptyDiscWaiter "", which already has a layout
QIODevice::seek (K3b::AudioTrackReader): The device is not open
org.kde.knotifications: Audio notification requested, but sound file from notifyrc file was not found, aborting audio notification
Merci pour vos suggestions, le mystère reste entier...Cela me rappelle un problème d'impression qui s'est résolu de lui même au grés d'une mise à jour.