Audio buffer loop / buzzing audio on stop

[Efenstor]

Hello. I'm getting the audio continuously looped when video is stopped. It's obviously the audio portion contained within the currently stopped frame. When video is played there is no problem, only when it's stopped. I just import any video file that I usually work with (4K AVCHD), double-click to preview or insert it into the timeline and getting the problem immediately.

My distribution is Debian stable (bookworm), I am using using MATE with X11 and PulseAudio. Flowblade was installed from Flatpak.

Here is the full command line output:

FLOWBLADE MOVIE EDITOR 2.10.0.3
-------------------------------
Launch script dir: /app/bin
Running from Flatpak installation...
modules path: /app/share/flowblade/Flowblade
MLT found, version: 7.17.0
numpy version: 1.21.6
Application version: 2.10.0
OS: GNOME 44 (Flatpak runtime)
Python 3.10.12 (main, Nov 10 2011, 15:00:00) [GCC 12.2.0]
GTK+ version: 3.24.38
XDG Config /home/olaf/.var/app/io.github.jliljebl.Flowblade/config/flowblade
XDG Data /home/olaf/.var/app/io.github.jliljebl.Flowblade/data/flowblade
XDG Cache /home/olaf/.var/app/io.github.jliljebl.Flowblade/cache/flowblade
Locale: ru_RU
Found translations at /app/share/flowblade/Flowblade/locale, using those.
Force use English.
Valid shortcut files found: ['flowblade.xml', 'premiere.xml']
Keyboard shortcuts file: flowblade.xml
Gtk version is 3.24.38, Flowblade theme is available.
Using Full Screen size for layout: 1920 x 1080
Small height: False
Small width: False
Detecting environment...
---
video_codecs:
  - a64multi
  - a64multi5
  - alias_pix
  - amv
  - apng
  - asv1
  - asv2
  - avrp
  - avui
  - ayuv
  - bitpacked
  - bmp
  - cfhd
  - cinepak
  - cljr
  - dnxhd
  - dpx
  - dvvideo
  - exr
  - ffv1
  - ffvhuff
  - fits
  - flashsv
  - flashsv2
  - flv
  - gif
  - h261
  - h263
  - h263p
  - huffyuv
  - jpeg2000
  - jpegls
  - ljpeg
  - magicyuv
  - mjpeg
  - mpeg1video
  - mpeg2video
  - mpeg4
  - msmpeg4v2
  - msmpeg4
  - 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
  - wrapped_avframe
  - wmv1
  - wmv2
  - xbm
  - xface
  - xwd
  - y41p
  - yuv4
  - zlib
  - zmbv
  - libaom-av1
  - libvpx
  - libvpx-vp9
  - libx264
  - libx264rgb
  - libx265
  - h263_v4l2m2m
  - h264_amf
  - h264_nvenc
  - h264_v4l2m2m
  - h264_vaapi
  - hevc_amf
  - hevc_nvenc
  - hevc_v4l2m2m
  - hevc_vaapi
  - mjpeg_vaapi
  - mpeg2_vaapi
  - mpeg4_v4l2m2m
  - vp8_v4l2m2m
  - vp8_vaapi
  - vp9_vaapi
...
---
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
  - sonic
  - sonicls
  - 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
  - libmp3lame
  - libopus
  - libvorbis
...
---
formats:
  - a64
  - ac3
  - adts
  - adx
  - aiff
  - alp
  - amr
  - amv
  - apm
  - apng
  - aptx
  - aptx_hd
  - 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
  - f4v
  - ffmetadata
  - fifo
  - fifo_test
  - filmstrip
  - fits
  - flac
  - flv
  - framecrc
  - framehash
  - framemd5
  - g722
  - g723_1
  - g726
  - g726le
  - gif
  - gsm
  - gxf
  - h261
  - h263
  - h264
  - hash
  - hds
  - hevc
  - hls
  - ico
  - ilbc
  - image2
  - image2pipe
  - ipod
  - ircam
  - ismv
  - ivf
  - jacosub
  - kvag
  - latm
  - lrc
  - m4v
  - 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
  - rm
  - roq
  - rso
  - rtp
  - rtp_mpegts
  - rtsp
  - sap
  - sbc
  - scc
  - film_cpk
  - segment
  - stream_segment,ssegment
  - smjpeg
  - smoothstreaming
  - sox
  - spx
  - spdif
  - srt
  - streamhash
  - sup
  - swf
  - tee
  - 3g2
  - 3gp
  - mkvtimestamp_v2
  - truehd
  - tta
  - ttml
  - uncodedframecrc
  - vc1
  - vc1test
  - voc
  - w64
  - wav
  - webm
  - webm_dash_manifest
  - webm_chunk
  - webp
  - webvtt
  - wsaud
  - wtv
  - wv
  - yuv4mpegpipe
  - alsa
  - fbdev
  - oss
  - pulse
  - sdl,sdl2
  - video4linux2,v4l2
  - xv
...
MLT detection succeeded, 181 formats, 108 video codecs and 78 audio codecs found.
644 MLT services found.
Loading render profiles...
ffmpeg version 5.1.1 Copyright (c) 2000-2022 the FFmpeg developers
built with gcc 12.2.0 (GCC)
configuration: --prefix=/app --enable-gpl --disable-static --enable-shared --disable-doc --enable-libfontconfig --enable-libfreetype --enable-libopus --enable-librsvg --enable-libvpx --enable-libx264 --enable-libx265 --enable-libpulse --enable-libmp3lame --enable-libvorbis --enable-libaom --enable-vaapi --enable-ffnvcodec --enable-nvenc --enable-amf --enable-libzimg
libavutil      57. 28.100 / 57. 28.100
libavcodec     59. 37.100 / 59. 37.100
libavformat    59. 27.100 / 59. 27.100
libavdevice    59.  7.100 / 59.  7.100
libavfilter     8. 44.100 /  8. 44.100
libswscale      6.  7.100 /  6.  7.100
libswresample   4.  7.100 /  4.  7.100
libpostproc    56.  6.100 / 56.  6.100
['ffmpeg', '-version']
return code: 0
ffmpeg available
Loading filters...
Loading transitions...
RGB Adjustment dropped for Color Adjustment
Hue dropped for Color Adjustment
Gamma dropped for Lift Gain Gamma
Adding full track compositors
restacking compositors!
Adding full track compositors DONE
G'MIC found
Player initialized with profile:  4K UHD 2160p 23.98 fps
Selected color NOT detected
BG color detected
Create SDL1 consumer...
restacking compositors!
Autosave started...
Saving project...
GPU test results {'NVENC H.264 High Profile / .mp4': -11, 'NVENC HEVC Main10 Profile / .mp4': -11, 'VAAPI H.264 / .mp4': 0}
[image2 @ 0x7ff4e0002380] The specified filename '/home/olaf/.var/app/io.github.jliljebl.Flowblade/cache/flowblade/thumbnails/b3598672defb6dbc05470fb5b3d69bf7.png' does not contain an image sequence pattern or a pattern is invalid.
[image2 @ 0x7ff4e0002380] Use a pattern such as %03d for an image sequence or use the -update option (with -frames:v 1 if needed) to write a single image.
Saving project...

[jliljebl]

This is a behavioral change in MLT that was introduced lately: https://github.com/mltframework/mlt/issues/924

I believe I can fix it for next version but unfortunately for now the workaround is to turn Audio Scrubbing off from the Audio menu in the left top corner of timeline.

Regrettably didn't notice during development because I don't keep Audio Scrubbing on.

[Efenstor]

Thanks! It's okay for now, I don't need scrubbing much.