flowblade fails to start on my GNOME/Wayland/Testing
See shell output:
---
video_codecs:
- a64multi
- a64multi5
- alias_pix
- amv
- apng
- asv1
- asv2
- avrp
- avui
- bitpacked
- bmp
- cfhd
- cinepak
- cljr
- dnxhd
- dpx
- dvvideo
- dxv
- exr
- ffv1
- ffvhuff
- fits
- flashsv
- flashsv2
- flv
- gif
- h261
- h263
- h263p
- hap
- huffyuv
- jpeg2000
- jpegls
- ljpeg
- magicyuv
- mjpeg
- mpeg1video
- mpeg2video
- mpeg4
- msmpeg4v2
- msmpeg4
- msrle
- msvideo1
- pam
- pbm
- pcx
- pfm
- pgm
- pgmyuv
- phm
- png
- ppm
- prores
- prores_aw
- prores_ks
- qoi
- qtrle
- r10k
- r210
- rawvideo
- roqvideo
- rpza
- rv10
- rv20
- sgi
- smc
- snow
- speedhq
- sunrast
- svq1
- targa
- tiff
- utvideo
- v210
- v308
- v408
- v410
- vbn
- vc2
- wbmp
- wrapped_avframe
- wmv1
- wmv2
- xbm
- xface
- xwd
- y41p
- yuv4
- zlib
- zmbv
- hdr
- libaom-av1
- libjxl_anim
- libjxl
- libopenjpeg
- librav1e
- libsvtav1
- libtheora
- libvpx
- libvpx-vp9
- libwebp_anim
- libwebp
- libx264
- libx264rgb
- libx265
- libxvid
- h263_v4l2m2m
- av1_nvenc
- av1_qsv
- av1_vaapi
- av1_vulkan
- h264_nvenc
- h264_qsv
- h264_v4l2m2m
- h264_vaapi
- h264_vulkan
- hevc_nvenc
- hevc_qsv
- hevc_v4l2m2m
- hevc_vaapi
- hevc_vulkan
- mjpeg_qsv
- mjpeg_vaapi
- mpeg2_qsv
- mpeg2_vaapi
- mpeg4_v4l2m2m
- vp8_v4l2m2m
- vp8_vaapi
- vp9_vaapi
- vp9_qsv
- vnull
...
---
audio_codecs:
- comfortnoise
- s302m
- aac
- ac3
- ac3_fixed
- alac
- aptx
- aptx_hd
- dca
- dfpwm
- eac3
- flac
- g723_1
- mlp
- mp2
- mp2fixed
- nellymoser
- opus
- real_144
- sbc
- truehd
- tta
- vorbis
- wavpack
- wmav1
- wmav2
- pcm_alaw
- pcm_bluray
- pcm_dvd
- pcm_f32be
- pcm_f32le
- pcm_f64be
- pcm_f64le
- pcm_mulaw
- pcm_s8
- pcm_s8_planar
- pcm_s16be
- pcm_s16be_planar
- pcm_s16le
- pcm_s16le_planar
- pcm_s24be
- pcm_s24daud
- pcm_s24le
- pcm_s24le_planar
- pcm_s32be
- pcm_s32le
- pcm_s32le_planar
- pcm_s64be
- pcm_s64le
- pcm_u8
- pcm_u16be
- pcm_u16le
- pcm_u24be
- pcm_u24le
- pcm_u32be
- pcm_u32le
- pcm_vidc
- roq_dpcm
- adpcm_adx
- adpcm_argo
- g722
- g726
- g726le
- adpcm_ima_amv
- adpcm_ima_alp
- adpcm_ima_apm
- adpcm_ima_qt
- adpcm_ima_ssi
- adpcm_ima_wav
- adpcm_ima_ws
- adpcm_ms
- adpcm_swf
- adpcm_yamaha
- libcodec2
- libgsm
- libgsm_ms
- libmp3lame
- libopus
- libshine
- libspeex
- libtwolame
- libvorbis
- anull
...
---
formats:
- a64
- ac3
- ac4
- adts
- adx
- aea
- aiff
- alp
- amr
- amv
- apm
- apng
- aptx
- aptx_hd
- apv
- argo_asf
- argo_cvg
- asf
- ass
- ast
- asf_stream
- au
- avi
- avif
- avm2
- avs2
- avs3
- bit
- caf
- cavsvideo
- codec2
- codec2raw
- crc
- dash
- data
- daud
- dfpwm
- dirac
- dnxhd
- dts
- dv
- eac3
- evc
- f4v
- ffmetadata
- fifo
- filmstrip
- fits
- flac
- flv
- framecrc
- framehash
- framemd5
- g722
- g723_1
- g726
- g726le
- gif
- gsm
- gxf
- h261
- h263
- h264
- hash
- hds
- hevc
- hls
- iamf
- ico
- ilbc
- image2
- image2pipe
- ipod
- ircam
- ismv
- ivf
- jacosub
- kvag
- latm
- lc3
- lrc
- m4v
- mcc
- md5
- matroska
- matroska
- microdvd
- mjpeg
- mlp
- mmf
- mov
- mp2
- mp3
- mp4
- mpeg
- vcd
- mpeg1video
- dvd
- svcd
- mpeg2video
- vob
- mpegts
- mpjpeg
- mxf
- mxf_d10
- mxf_opatom
- "null"
- nut
- obu
- oga
- ogg
- ogv
- oma
- opus
- alaw
- mulaw
- vidc
- f64be
- f64le
- f32be
- f32le
- s32be
- s32le
- s24be
- s24le
- s16be
- s16le
- s8
- u32be
- u32le
- u24be
- u24le
- u16be
- u16le
- u8
- psp
- rawvideo
- rcwt
- rm
- roq
- rso
- rtp
- rtp_mpegts
- rtsp
- sap
- sbc
- scc
- film_cpk
- segment
- "stream_segment,ssegmentffmpeg version 8.1.2-2+b1 Copyright (c) 2000-2026 the FFmpeg developers
built with gcc 15 (Debian 15.3.0-1)
configuration: --prefix=/usr --extra-version=2+b1 --toolchain=hardened --libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu --arch=amd64 --enable-gpl --disable-stripping --disable-pocketsphinx --disable-libcaca --disable-libmfx --disable-omx --enable-gnutls --enable-libaom --enable-libass --enable-libbs2b --enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite --enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libglslang --enable-libgme --enable-libgsm --enable-libharfbuzz --enable-libmp3lame --enable-libmysofa --enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-librubberband --enable-libshine --enable-libsnappy --enable-libsoxr --enable-libspeex --enable-libtheora --enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg --enable-openal --enable-opencl --enable-opengl --disable-sndio --enable-libvpl --enable-libdc1394 --enable-libdrm --enable-libiec61883 --enable-chromaprint --enable-frei0r --enable-ladspa --enable-libbluray --enable-libdvdnav --enable-libdvdread --enable-libjack --enable-libjxl --enable-libpulse --enable-librabbitmq --enable-librist --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libx264 --enable-libzmq --enable-libzvbi --enable-lv2 --enable-sdl2 --enable-libplacebo --enable-librav1e --enable-librsvg --enable-shared
libavutil 60. 26.102 / 60. 26.102
libavcodec 62. 28.102 / 62. 28.102
libavformat 62. 12.102 / 62. 12.102
libavdevice 62. 3.102 / 62. 3.102
libavfilter 11. 14.102 / 11. 14.102
libswscale 9. 5.102 / 9. 5.102
libswresample 6. 3.102 / 6. 3.102
Exiting with exit code 0
Traceback (most recent call last):
File "/usr/share/flowblade/Flowblade/app.py", line 318, in on_activate
editorstate.project = projectdata.get_default_project()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/share/flowblade/Flowblade/projectdata.py", line 711, in get_default_project
project = Project(profile)
File "/usr/share/flowblade/Flowblade/projectdata.py", line 111, in __init__
self.add_unnamed_sequence()
~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/share/flowblade/Flowblade/projectdata.py", line 328, in add_unnamed_sequence
self.add_named_sequence(name)
~~~~~~~~~~~~~~~~~~~~~~~^^^^^^
File "/usr/share/flowblade/Flowblade/projectdata.py", line 347, in add_named_sequence
seq.create_default_tracks()
~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/share/flowblade/Flowblade/sequence.py", line 214, in create_default_tracks
self.add_full_track_compositors()
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^^
File "/usr/share/flowblade/Flowblade/sequence.py", line 737, in add_full_track_compositors
compositor = self.create_compositor("##blend")
File "/usr/share/flowblade/Flowblade/sequence.py", line 636, in create_compositor
compositor.create_mlt_objects(self.profile)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'NoneType' object has no attribute 'create_mlt_objects'
FLOWBLADE MOVIE EDITOR 2.24.2
-----------------------------
Launch script dir: /usr/bin
Running from installation...
modules path: /usr/share/flowblade/Flowblade
MLT found, version: 7.40.0
Application version: 2.24.2
OS: Debian GNU/Linux forky/sid
Python 3.14.6 (main, Jun 10 2026, 18:54:31) [GCC 15.2.0]
GTK+ version: 3.24.52
XDG Config /home/osamu/.config/flowblade
XDG Data /home/osamu/.local/share/flowblade
XDG Cache /home/osamu/.cache/flowblade
Locale: en_US
Translations at /usr/share/locale were not found, using program root directory translations.
Use OS locale language.
Valid shortcut files found: ['flowblade.xml', 'premiere.xml']
Keyboard shortcuts file: flowblade.xml
Using Full Screen size for layout: 1920 x 1080
Small height: False
Small width: False
Detecting environment...
MLT detection succeeded, 190 formats, 131 video codecs and 83 audio codecs found.
622 MLT services found.
Loading render profiles...
['ffmpeg', '-version']
return code: 0
ffmpeg CLI available
Loading filters...
MLT service frei0r.alpha0ps_alphagrad not found.
MLT service frei0r.mask0mate not found.
MLT service frei0r.alpha0ps_alphaspot not found.
MLT service frei0r.alpha0ps_alpha0ps not found.
MLT service frei0r.select0r not found.
MLT service frei0r.spillsupress not found.
MLT service frei0r.premultiply not found.
MLT service frei0r.glow not found.
MLT service frei0r.scanline0r not found.
MLT service frei0r.rgbsplit0r not found.
MLT service frei0r.cartoon not found.
MLT service frei0r.vignette not found.
MLT service frei0r.emboss not found.
MLT service frei0r.dither not found.
MLT service frei0r.colorhalftone not found.
MLT service frei0r.softglow not found.
MLT service frei0r.glitch0r not found.
MLT service frei0r.edgeglow not found.
MLT service frei0r.sobel not found.
MLT service frei0r.pixeliz0r not found.
MLT service frei0r.squareblur not found.
MLT service frei0r.IIRblur not found.
MLT service frei0r.rgbnoise not found.
MLT service frei0r.bw0r not found.
MLT service frei0r.contrast0r not found.
MLT service frei0r.saturat0r not found.
MLT service frei0r.hueshift0r not found.
MLT service frei0r.levels not found.
MLT service frei0r.coloradj_RGB not found.
MLT service frei0r.coloradj_RGB not found.
MLT service frei0r.colgate not found.
MLT service frei0r.cairogradient not found.
MLT service frei0r.cluster not found.
MLT service frei0r.threelay0r not found.
MLT service frei0r.threshold0r not found.
MLT service frei0r.primaries not found.
MLT service frei0r.colordistance not found.
MLT service frei0r.posterize not found.
MLT service frei0r.colortap not found.
MLT service frei0r.sigmoidaltransfer not found.
MLT service frei0r.tint0r not found.
MLT service frei0r.colorize not found.
MLT service frei0r.distort0r not found.
MLT service frei0r.defish0r not found.
MLT service frei0r.lenscorrection not found.
MLT service frei0r.nosync0r not found.
MLT service frei0r.cairoimagegrid not found.
MLT service frei0r.elastic_scale not found.
MLT service frei0r.hqdn3d not found.
MLT service frei0r.sharpness not found.
MLT service frei0r.letterb0xed not found.
MLT service frei0r.baltan not found.
MLT service frei0r.vertigo not found.
MLT service frei0r.nervous not found.
Loading transitions...
MLT transition frei0r.cairoaffineblend not found.
MLT transition frei0r.cairoblend not found.
MLT transition frei0r.darken not found.
MLT transition frei0r.hardlight not found.
MLT transition frei0r.addition not found.
MLT transition frei0r.burn not found.
MLT transition frei0r.difference not found.
MLT transition frei0r.divide not found.
MLT transition frei0r.color_only not found.
MLT transition frei0r.dodge not found.
MLT transition frei0r.grain_extract not found.
MLT transition frei0r.grain_merge not found.
MLT transition frei0r.hue not found.
MLT transition frei0r.lighten not found.
MLT transition frei0r.multiply not found.
MLT transition frei0r.overlay not found.
MLT transition frei0r.saturation not found.
MLT transition frei0r.screen not found.
MLT transition frei0r.softlight not found.
MLT transition frei0r.subtract not found.
MLT transition frei0r.value not found.
MLT transition frei0r.alphaxor not found.
MLT transition frei0r.alphain not found.
MLT transition frei0r.alphaout not found.
GPU test results {'NVENC H.264 High Profile / .mp4': -11, 'NVENC HEVC / .mp4': -11, 'NVENC HEVC HDR / .mp4': -11, 'VAAPI H.264 / .mp4': 0}
"
- smjpeg
- smoothstreaming
- sox
- spx
- spdif
- srt
- streamhash
- sup
- swf
- tee
- 3g2
- 3gp
- mkvtimestamp_v2
- truehd
- tta
- ttml
- uncodedframecrc
- vc1
- vc1test
- voc
- vvc
- w64
- wav
- webm
- webm_dash_manifest
- webm_chunk
- webp
- webvtt
- whip
- wsaud
- wtv
- wv
- yuv4mpegpipe
- chromaprint
- alsa
- fbdev
- oss
- pulse
- "video4linux2,v4l2"
- xv
...
GUI dialog displays:
PID: 55937 (python3)
TID: 55958 (Thread-2)
UID: 1000 (osamu)
GID: 1000 (osamu)
Signal: 11 (SEGV) si_code: SEGV_MAPERR
Timestamp: Fri 2026-07-24 11:19:25 JST (10s ago)
Command Line: /usr/bin/python3 /usr/share/flowblade/Flowblade/launch/flowbladegputestrender
Executable: /usr/bin/python3.14
Control Group: /user.slice/user-1000.slice/user@1000.service/app.slice/app-org.gnome.Terminal.slice/vte-spawn-c55c5d3a-8917-4a3b-afc0-32997c474ff6.scope
Unit: user@1000.service
User Unit: vte-spawn-c55c5d3a-8917-4a3b-afc0-32997c474ff6.scope
Slice: user-1000.slice
Owner UID: 1000 (osamu)
Boot ID: f9f64407f4ae40cfa2b7ce1d858b5250
Machine ID: ce38c7ee6b3945ba83ee1ffe1f380ec7
Hostname: goofy
Storage: /var/lib/systemd/coredump/core.python3.1000.f9f64407f4ae40cfa2b7ce1d858b5250.55937.1784859565000000.zst (present)
Size on Disk: 17.2M
Message: Process 55937 (python3) of user 1000 dumped core.
Module libgfortran.so.5 from deb gcc-16-16.1.0-2.amd64
Module libgomp.so.1 from deb gcc-16-16.1.0-2.amd64
Module libstdc++.so.6 from deb gcc-16-16.1.0-2.amd64
Module libgcc_s.so.1 from deb gcc-16-16.1.0-2.amd64
Module libzstd.so.1 from deb libzstd-1.5.7+dfsg-3+b2.amd64
Module libblkid.so.1 from deb util-linux-2.42.2-2.amd64
Module libmount.so.1 from deb util-linux-2.42.2-2.amd64
Module libatomic.so.1 from deb gcc-16-16.1.0-2.amd64
Stack trace of thread 55958:
#0 0x00007f4b026a3213 n/a (libmltavformat.so + 0x1d213)
#1 0x00007f4b14802289 start_thread (libc.so.6 + 0x95289)
#2 0x00007f4b14880d08 __clone3 (libc.so.6 + 0x113d08)
Stack trace of thread 55946:
#0 0x00007f4b1480a4be __syscall_cancel_arch (libc.so.6 + 0x9d4be)
#1 0x00007f4b147fec84 __internal_syscall_cancel (libc.so.6 + 0x91c84)
#2 0x00007f4b147ff29c __futex_abstimed_wait_common64 (libc.so.6 + 0x9229c)
#3 0x00007f4b14801828 __pthread_cond_wait_common (libc.so.6 + 0x94828)
#4 0x00007f4ae005ed6b n/a (libopenblas.so.0 + 0xa16d6b)
#5 0x00007f4b14802289 start_thread (libc.so.6 + 0x95289)
#6 0x00007f4b14880d08 __clone3 (libc.so.6 + 0x113d08)
Stack trace of thread 55942:
#0 0x00007f4b1480a4be __syscall_cancel_arch (libc.so.6 + 0x9d4be)
#1 0x00007f4b147fec84 __internal_syscall_cancel (libc.so.6 + 0x91c84)
#2 0x00007f4b147feccd __syscall_cancel (libc.so.6 + 0x91ccd)
#3 0x00007f4b1487419e __GI_ppoll (libc.so.6 + 0x10719e)
#4 0x00007f4b14249a04 n/a (libglib-2.0.so.0 + 0x5fa04)
#5 0x00007f4b1424a0f0 g_main_context_iteration (libglib-2.0.so.0 + 0x600f0)
#6 0x00007f4b127120cd n/a (libdconfsettings.so + 0xc0cd)
#7 0x00007f4b1427c536 n/a (libglib-2.0.so.0 + 0x92536)
#8 0x00007f4b14802289 start_thread (libc.so.6 + 0x95289)
#9 0x00007f4b14880d08 __clone3 (libc.so.6 + 0x113d08)
Stack trace of thread 55960:
#0 0x00007f4b148d5c09 __memset_avx2_unaligned_erms (libc.so.6 + 0x168c09)
#1 0x00007f4af222a5d6 av_buffer_allocz (libavutil.so.60 + 0x2a5d6)
#2 0x00007f4af222aef6 av_buffer_pool_get (libavutil.so.60 + 0x2aef6)
#3 0x00007f4af2a3e12e avcodec_default_get_buffer2 (libavcodec.so.62 + 0x43e12e)
#4 0x00007f4af292fe9b n/a (libavcodec.so.62 + 0x32fe9b)
#5 0x00007f4af2e79be9 n/a (libavcodec.so.62 + 0x879be9)
#6 0x00007f4af2e79ce1 n/a (libavcodec.so.62 + 0x879ce1)
#7 0x00007f4af2a93976 n/a (libavcodec.so.62 + 0x493976)
#8 0x00007f4af2a98375 n/a (libavcodec.so.62 + 0x498375)
#9 0x00007f4af2aa1499 n/a (libavcodec.so.62 + 0x4a1499)
#10 0x00007f4af292ddfe n/a (libavcodec.so.62 + 0x32ddfe)
#11 0x00007f4af2e79898 n/a (libavcodec.so.62 + 0x879898)
#12 0x00007f4b14802289 start_thread (libc.so.6 + 0x95289)
#13 0x00007f4b14880d08 __clone3 (libc.so.6 + 0x113d08)
Stack trace of thread 55983:
#0 0x00007f4af17aa754 n/a (libswscale.so.9 + 0x1aa754)
ELF object binary architecture: AMD x86-64