Avidemux Forum

Quote from: JanMeki on Today at 11:44:21 AM

Code Select Expand

/tmp/.mount_AvidemmePfkG/usr/bin/avidemux3_portable: symbol lookup error: /tmp/.mount_AvidemmePfkG/usr/lib/libgobject-2.0.so.0: undefined symbol: g_sort_array
/home/abc

My best bet would be recommending you to build Avidemux from source locally on your system (which is very easy on Linux, see github.com/mean00/avidemux2) so that libraries included into the appImage don't clash with system libraries.

You don't need to package and install Avidemux to run it, it can be excuted via a wrapper script (all explained in the README).

If the Avidemux window can't fit into the available screen real estate, Qt may distort the frame used to draw the video at least with the unaccelerated "Qt" video display if I am not mistaken. Avidemux won't add scroll bars to video frame, selecting zoom level too high will at least try to push parts of the GUI out of sight. If your (presumably) laptop has a high-density display, you might also consider disabling automatic HighDPI scaling in Qt, e.g. by setting the env var QT_SCALE_FACTOR to 1:

QT_SCALE_FACTOR=1 ./relative/path/to/Avidemux-x86_64_20261018_legacy.AppImage

Make sure you use an accelerated video display in Avidemux, i.e. NOT "Qt" / "RGB", preferably VDPAU (but with the graphics wired to Intel this might not work), OpenGL / QtGl or XVideo, else all the scaling work is done on the CPU. The best options are to use VDPAU hw decoder with VDPAU display or LibVA decoder with LibVA display (whatever works). If NVDEC is used, it always downloads decoded pictures to the main memory that need to be re-uploaded to the graphics card for display. This may still be beneficial, but not as efficient as it can be.

Another huge cause of lag can be the status bar itself, especially at 60 fps. Try hiding it via the "View" menü or restrict refresh rate of the GUI in Avidemux Preferences to a lower value e.g. by enabling the cap and setting the redraw interval to 20 ms (1000/20 = 50 fps) or higher.

Already when playing 1080p60 videos (h264) I'm getting this problem sometimes. It may have something to do with scaling, because when I use a zoom level of 1:4 or 1:2 I never get the issue but already when using fit to window (65%), 1:1 or 2:1 I'm getting major A/V desync. When opening a 1920x1080 video the zoom level is 69% but if I change it to fit to window, which is 65% I'm getting desync again. I've tried with and without hw acceleration enabled (nvdec). I'm not maxing my hardware, I've got plenty of CPU, dGPU, iGPU left.

Usage:
CPU: 15%
iGPU (Render/3D): 35%
dGPU (if used): ~5%

I can play 4k60 h264 videos fine with smplayer/mpv.

Linux Mint 22.3
Avidemux-x86_64_20261018_legacy.AppImage, Avidemux-x86_64_20260516_legacy.AppImage, ...
Intel/nVidia Optimus
1920x1080 display

If I set the zoom to 1:1 when viewing a video it stretches the video instead of zooming it (it fills the viewing area with a wrong aspect ratio). 1080p video on 1920x1080 screen. Fit to window is 65% zoom and correct AR.

Linux Mint 22.3
Avidemux-x86_64_20261018_legacy.AppImage

Quote from: eumagga0x2a on October 21, 2026, 12:25:36 PMJust curious, why the legacy one? Does the normal appImage that requires libc (glibc) 2.38 or later fail to run (as it does on Debian 12 due to libc version being too old)?

I'm on (Ubuntu GLIBC 2.39-0ubuntu8.9) 2.39

This is what I get if try to run the non-legacy appimage:

$ '/home/abc/Apps/Avidemux-x86_64_20261018.AppImage'
Using bundled freetype, fontconfig and fribidi. Export ADM_APPIMAGE_USE_SYSTEM_FONT_LIBS=1 to use the system ones instead.
This is recommended for systems with fontconfig >= 2.13
/tmp/.mount_AvidemmePfkG/usr/bin/avidemux3_portable: symbol lookup error: /tmp/.mount_AvidemmePfkG/usr/lib/libgobject-2.0.so.0: undefined symbol: g_sort_array
/home/abc

You are correct. Had to add the folder as an exclusion in Windows Security.
In case anyone runs into the same issue, these are the steps:

1) start Windows Security
2) click Virus & threat protection
3) on the right side under 'Virus & threat protection settings' click "Manage settings"

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4) scroll all the way down to 'Exclusions' and click "Add or remove exclusions"

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5) click Add an exclusion

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6) select "Folder"
7) browse to the correct folder and select it

Quote from: Yisc76 on October 23, 2026, 10:02:22 AMThen I needed it yesterday and the program just won't launch. Had to stop de proces using taskmanager and then it does start, but goes to "Not Responding" immediately. I left it sitting as I had to go and do thing else and when I came back to the computer, I was responding and I could use it fine.

For sure antivirus, probably Windows own built-in one, (re-) uploading every DLL dynamically loaded by every one of numerous Avidemux plugins (almost everything in Avidemux is a plugin) to the mothership and waiting for response. I doubt that anything can be done about it except for adding Avidemux program folder to path exclusions in Microsoft Defender or its equivalent.

You can check whether this is really the reason for the issue by temporally moving (almost) all Avidemux plugins (maybe except for demuxers and most necessary muxers) out of Avidemux program directory.

edit: please see https://avidemux.org/smif/index.php/topic,20186.msg95347.html

After downloading and installing, it worked fine. Then I needed it yesterday and the program just won't launch. Had to stop de proces using taskmanager and then it does start, but goes to "Not Responding" immediately. I left it sitting as I had to go and do thing else and when I came back to the computer, I was responding and I could use it fine. Today I am having the same issue. First start nothing happens (exe is in the proces list, but program is not showing) and then after stopping the proces, it does launch but goes to Not Responding.

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Someone has done all the scripting for building everything super fast on a temporary ram drive.

Check out this thread.
Script to build app, and clean up after yourself.