Avidemux crashes without strace

damnbug · 2025-08-01 18:38:55

Suddenly, Avidemux started crashing. However, if I start it from a terminal using strace, it just works. Why?

Error:

*********** BACKTRACK **************
/usr/lib/libADM_core6.so(ADM_backTrack+0x7e) [0x71af820cb49e]:0:<ADM_backTrack>:-2
/usr/lib/libc.so.6(+0x3e540) [0x71af7f84c540]:1:<>:-2
*********** BACKTRACK **************
*********** Exiting **************

damnbug · 2025-08-01 18:39:40

By the way, the command is avidemux3_qt5.

seth · 2025-08-01 19:34:25

Race condition?
strace will slow down (and to some extent synchronize) the execution considerably.
Can you run it in gdb?
Can you get a better baktrace than that? In doubt it might leave behind a https://wiki.archlinux.org/title/Core_d … _core_dump ?

uqs · 2026-06-05 19:40:38

Not OP, but I get:

% avidemux3_qt5
*************************
  Avidemux v2.8.1
*************************
 http://www.avidemux.org
 Code      : Mean, JSC, Grant Pedersen,eumagga0x2a
 GFX       : Nestor Di, nestordi@augcyl.org
 Design    : Jakub Misak
 FreeBSD   : Anish Mistry, amistry@am-productions.biz
 Audio     : Mihail Zenkov
 Mac OS X  : Kuisathaverat, Harry van der Wolf
 Win32     : Grant Pedersen

Compiler: GCC 15.2.1 20260209
Build Target: Linux (x86-64)
User Interface: Qt (5.15.19)

Large file available: 1 offset
Time: Fri Jun  5 21:38:56 2026

0: avidemux3_qt5

Initialising prefs
...

 [initGUI] 19:38:56-349  OpenGL enabled at build time, checking whether we should run it... no.

*********** BACKTRACK **************
/usr/lib/libADM_core6.so(ADM_backTrack+0x7e) [0x7f498a6584de]:0:<ADM_backTrack>:-2
/usr/lib/libc.so.6(+0x3e8f0) [0x7f498743e8f0]:1:<>:-2
/usr/lib/libfontconfig.so.1(+0xe9ac) [0x7f498161c9ac]:2:<>:-2
/usr/lib/libfontconfig.so.1(FcCharSetHasChar+0x22) [0x7f498161e902]:3:<FcCharSetHasChar>:-2
/usr/lib/libQt5XcbQpa.so.5(+0xae95e) [0x7f498171995e]:4:<>:-2
/usr/lib/libQt5Gui.so.5(_ZNK16QFontEngineMulti10glyphIndexEj+0x18a) [0x7f49880109fa]:5:<QFontEngineMulti::glyphIndex(unsigned int) const>:0
/usr/lib/libQt5Gui.so.5(_ZNK12QFontMetrics17horizontalAdvanceE5QChar+0xd8) [0x7f498801b638]:6:<QFontMetrics::horizontalAdvance(QChar) const>:0
/usr/lib/libQt5Widgets.so.5(_ZNK9QLineEdit8sizeHintEv+0x110) [0x7f49888b58b0]:7:<QLineEdit::sizeHint() const>:0
/usr/lib/libQt5Widgets.so.5(_ZNK13QWidgetItemV222updateCacheIfNecessaryEv+0x42) [0x7f4988779f72]:8:<QWidgetItemV2::updateCacheIfNecessary() const>:0
/usr/lib/libQt5Widgets.so.5(_ZNK13QWidgetItemV211maximumSizeEv+0x96) [0x7f498877b146]:9:<QWidgetItemV2::maximumSize() const>:0
/usr/lib/libQt5Widgets.so.5(+0x16ea59) [0x7f498876ea59]:10:<>:-2
/usr/lib/libQt5Widgets.so.5(_ZThn16_NK10QBoxLayout11maximumSizeEv+0x78) [0x7f4988770078]:11:<non-virtual thunk to QBoxLayout::maximumSize() const>:0
/usr/lib/libQt5Widgets.so.5(+0x16ea59) [0x7f498876ea59]:12:<>:-2
/usr/lib/libQt5Widgets.so.5(_ZThn16_NK10QBoxLayout11maximumSizeEv+0x78) [0x7f4988770078]:13:<non-virtual thunk to QBoxLayout::maximumSize() const>:0
/usr/lib/libQt5Widgets.so.5(+0x16ea59) [0x7f498876ea59]:14:<>:-2
/usr/lib/libQt5Widgets.so.5(_ZN10QBoxLayout11setGeometryERK5QRect+0x778) [0x7f498876fd28]:15:<QBoxLayout::setGeometry(QRect const&)>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QLayoutPrivate8doResizeEv+0x9a) [0x7f4988777cca]:16:<QLayoutPrivate::doResize()>:0
/usr/lib/libQt5Widgets.so.5(_ZN7QLayout8activateEv+0x111) [0x7f4988779051]:17:<QLayout::activate()>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QWidgetPrivate14show_recursiveEv+0x66) [0x7f4988791c96]:18:<QWidgetPrivate::show_recursive()>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QWidgetPrivate12showChildrenEb+0x17a) [0x7f4988791e3a]:19:<QWidgetPrivate::showChildren(bool)>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QWidgetPrivate11show_helperEv+0x56) [0x7f4988791996]:20:<QWidgetPrivate::show_helper()>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QWidgetPrivate10setVisibleEb+0x1c7) [0x7f4988792037]:21:<QWidgetPrivate::setVisible(bool)>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QWidgetPrivate12showChildrenEb+0x15b) [0x7f4988791e1b]:22:<QWidgetPrivate::showChildren(bool)>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QWidgetPrivate11show_helperEv+0x56) [0x7f4988791996]:23:<QWidgetPrivate::show_helper()>:0
/usr/lib/libQt5Widgets.so.5(_ZN14QWidgetPrivate10setVisibleEb+0x1c7) [0x7f4988792037]:24:<QWidgetPrivate::setVisible(bool)>:0
avidemux3_qt5(+0x983d9) [0x555ced9eb3d9]:25:<>:-2
avidemux3_qt5(+0x453fa) [0x555ced9983fa]:26:<>:-2
avidemux3_qt5(+0x2fbcb) [0x555ced982bcb]:27:<>:-2
/usr/lib/libc.so.6(+0x27741) [0x7f4987427741]:28:<>:-2
/usr/lib/libc.so.6(__libc_start_main+0x89) [0x7f4987427879]:29:<__libc_start_main>:-2
*********** BACKTRACK **************
*********** Exiting **************

Lone_Wolf · 2026-06-05 19:49:04

damnbug wrote:

Suddenly, Avidemux started crashing. However, if I start it from a terminal using strace, it just works. Why?

Does starting avixdemux3_qt5 from a terminal using strace also works for you ?
If not, you probably have a different issue and should start a new thread.

seth · 2026-06-05 20:04:58

Don't - that's the fontconfig issue.
Either
- downgrade fontconfig to 2.17.x (will work)
- run "fc-cache -r" # might work
- remove /etc/conf.d/48-guessfamily.conf # or this might

Lone_Wolf · 2026-06-05 20:12:55

seth wrote:

remove /etc/conf.d/48-guessfamily.conf

Guess that should be /etc/fonts/conf.d/48-guessfamily.conf ?

seth · 2026-06-05 20:14:40

Yes "should" …

Arch Linux

#1 2025-08-01 18:38:55

Avidemux crashes without strace

#2 2025-08-01 18:39:40

Re: Avidemux crashes without strace

#3 2025-08-01 19:34:25

Re: Avidemux crashes without strace

#4 2026-06-05 19:40:38

Re: Avidemux crashes without strace

#5 2026-06-05 19:49:04

Re: Avidemux crashes without strace

#6 2026-06-05 20:04:58

Re: Avidemux crashes without strace

#7 2026-06-05 20:12:55

Re: Avidemux crashes without strace

#8 2026-06-05 20:14:40

Re: Avidemux crashes without strace

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