it doesn't happen here, is this bug still there?

Still happens here. Sorry, I missed jelly's comment.

#0 0x00007fffcee64f19 in UtilStr::Append(void const*, long) () from /usr/lib/libvisual-0.4/actor/actor_gforce.so
#1 0x00007fffcee4b7eb in GForce::Print(char*) () from /usr/lib/libvisual-0.4/actor/actor_gforce.so
#2 0x00007fffcee4b869 in GForce::Println(char*) () from /usr/lib/libvisual-0.4/actor/actor_gforce.so
#3 0x00007fffcee4f176 in GForce::GForce(void*) () from /usr/lib/libvisual-0.4/actor/actor_gforce.so
#4 0x00007fffcee69ccc in lv_gforce_init () from /usr/lib/libvisual-0.4/actor/actor_gforce.so
#5 0x00007fffee2c4522 in visual_plugin_realize () from /usr/lib/libvisual-0.4.so.0
#6 0x00007ffff66520dd in bg_lv_get_info () from /usr/lib/libgmerlin.so.0
#7 0x00007ffff668b24f in ?? () from /usr/lib/libgmerlin.so.0
#8 0x00007ffff668b97f in ?? () from /usr/lib/libgmerlin.so.0
#9 0x00007ffff668c338 in bg_plugin_registry_create_with_options () from /usr/lib/libgmerlin.so.0
#10 0x00007ffff668c86d in bg_plugin_registry_create () from /usr/lib/libgmerlin.so.0
#11 0x00000000004607a0 in ?? ()
#12 0x000000000041f077 in ?? ()
#13 0x00007ffff3f07f6d in __libc_start_main () from /lib/libc.so.6
#14 0x000000000040ecd9 in ?? ()
#15 0x00007fffffffe128 in ?? ()
#16 0x00000000ffffffff in ?? ()
#17 0x0000000000000001 in ?? ()
#18 0x00007fffffffe472 in ?? ()
#19 0x0000000000000000 in ?? ()

Do I need to recompile gmerlin and/or glibc for debug symbols?

This output tells me not much, rebuilding with debug symbols should give more info

Same thing happens here. Although, it spits out quite a lot more after the "Plugin failed":

[pluginregistry] Error: dlopen failed for /usr/lib/gmerlin/plugins/ir_png.so: /usr/lib/gmerlin/plugins/ir_png.so: undefined symbol: png_set_gray_1_2_4_to_8
[utils] Info: Created directory /home/asmund/.gmerlin
jackd 0.120.1
Copyright 2001-2009 Paul Davis, Stephane Letz, Jack O'Quinn, Torben Hohn and others.
jackd comes with ABSOLUTELY NO WARRANTY
This is free software, and you are welcome to redistribute it
under certain conditions; see the file COPYING for details

could not open driver .so '/usr/lib/jack/jack_firewire.so': libffado.so.2: cannot open shared object file: No such file or directory

JACK compiled with System V SHM support.
loading driver ..
creating alsa driver ... hw:0|hw:0|1024|2|48000|0|0|nomon|swmeter|-|32bit
control device hw:0
control open "hw:0" (No such file or directory)
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
ALSA lib pcm_hw.c:1401:(_snd_pcm_hw_open) Invalid value for card
ALSA: Cannot open PCM device alsa_pcm for playback. Falling back to capture-only mode
cannot load driver module alsa
could not connect to jack.
[codecinfo] Error: dlopen failed for /usr/lib/libquicktime/lqt_x264.so: libx264.so.115: cannot open shared object file: No such file or directory
zsh: segmentation fault openmovieeditor

So I am guessing the problem is unrelated to the plugin failure.

On a slightly related note: the dependencies for this package is wrong, I had to install "fltk" manually after I installed this package.

Program received signal SIGSEGV, Segmentation fault.
0x0000000000440eb5 in nle::Track::length (this=<optimized out>) at Track.cxx:160
160 Track.cxx: No such file or directory.
in Track.cxx
(gdb) subgraph starting at openmovieeditor timed out (subgraph_wait_fd=17, status = 0, state = Triggered, pollret = 0 revents = 0x0)
pp: cannot clean up byte from graph wait fd (Resource temporarily unavailable)

Where in Track.cxx it contains:
sl_map( m_clips, clip_length_helper, &max );

http://gentoo-overlays.zugaina.org/pro-audio/portage/media-video/openmovieeditor/ you might try to patch it..

Confirmed for 0.0.20090105-7 on x86_64.

~% openmovieeditor
When submitting a BUG report, or SUPPORT request, please include the following information:
(See Help->About... too)
----8<-----------------------
Open Movie Editor Version: 0.0.20090105
Libquicktime Version: 1.2.2
Libquicktime API Version: 12
/etc/lsb-release:
DISTRIB_DESCRIPTION="Arch Linux"
----8<-----------------------
[pluginregistry] Error: dlopen failed for /usr/lib/gmerlin/plugins/ir_png.so: /usr/lib/gmerlin/plugins/ir_png.so: undefined symbol: png_set_gray_1_2_4_to_8
[utils] Info: Created directory /home/alexander/.gmerlin
Jack Samplerate: 48000
[1] 4118 segmentation fault (core dumped) openmovieeditor

I rebuilt it, so it should not fail on png_set_gray_1_2_4_to_8

Still segfaults for openmovieeditor 0.0.20090105-8

[pluginregistry] Error: dlopen failed for /usr/lib/gmerlin/plugins/ir_png.so: /usr/lib/gmerlin/plugins/ir_png.so: undefined symbol: png_set_gray_1_2_4_to_8

http://www.libpng.org/pub/png/src/libpng-1.2.x-to-1.4.x-summary.txt
m. The function png_set_gray_1_2_4_to_8() was removed. It has been
deprecated since libpng-1.0.18 and 1.2.9, when it was replaced with
png_set_expand_gray_1_2_4_to_8() because the former function also
expanded palette images.

please try gmerlin 1.0.0-4

Still segfaults:

% openmovieeditor
When submitting a BUG report, or SUPPORT request, please include the following information:
(See Help->About... too)
----8<-----------------------
Open Movie Editor Version: 0.0.20090105
Libquicktime Version: 1.2.3
Libquicktime API Version: 12
/etc/lsb-release:
DISTRIB_DESCRIPTION="Arch Linux"
----8<-----------------------
Jack Samplerate: 48000
[1] 25224 segmentation fault (core dumped) openmovieeditor

gmerlin 1.0.0-4
openmovieeditor 0.0.20090105-8
x86_64.

openmovieeditor seems to have been abandoned since early 2009 [1] [2] [3].

How about moving it to unsupported?

[1] https://sourceforge.net/projects/openmovieeditor/files/openmovieeditor/
[2] https://sourceforge.net/mailarchive/forum.php?forum_name=openmovieeditor-developers
[3] https://sourceforge.net/mailarchive/forum.php?forum_name=openmovieeditor-list

I have tried to fix it too, but its really a pain in the ass. Certainly when there will be a libpng update. So i won't have a problem with it ;)

moved to aur
https://aur.archlinux.org/packages.php?ID=55790