Avidemux Forum

Does Avidemux log these kinds of "EXCEPTION_ACCESS_VIOLATION" errors anywhere? I had a series of them before I finally figured out the culprit(s) and the fix(es), but I did not think to make a note of the details of the Error for future reference.
Any chance they got logged somewhere?

Say YES to the re-encoding. Then do a COPY SAVE (on both video and audio - no filters) of the file.
Load the newly saved file. The video frames should be corrected, but if your audio is still out of sync, use the audio Shift to move it back or ahead til sync is restored, and then COPY SAVE again.
If that does not help (with this problem or future ones), then it's probably more complicated than my experiences with keyframes and audio issues. 

For what it's worth at this point (4 years later), I had a nightmare of persistent Filter Exception errors crashing the program. They would wait until the very end of converting a video with Average Bitrate (2 pass) and many other edits and filters, including fade-ins/outs at the start and end of the video. Beofre I added these fade filters, the project converted fine. Turns out, the fade filters would make Avidemux get a little pissy because of something to do with the B-frames. If the video ended on a B-frame instead of an I-frame or P-frame, the error would get triggered and crash the program. Modifying my edits for duration and minding the keyframes seems to have helped, but I also made an adjustment to the audio when I discovered the actual audio source did not match the duration of the video, resulting in NO audio (not mute, but no audio data at all) at the start and end of the video. I made fixes to that and replaced the audio with a new WAV file. I'm not sure which fix did the trick, but my conversion FINALLY completed without triggering the exception error and crashing.
So when you get crashes form edits, consider the keyframes, and if you can, extract the audio and examine that.

And now it's working for me again. A lot of packages seem to have gotten updates since the 13th, and sometime in the last week I ran Xcode and that installed some new libraries for macOS. I'm not sure which one of those did the trick.

Quote from: Ferdi on May 20, 2026, 10:25:51 PMThe package qt6-base-private-dev is not listed, nor installed as a dependency from the createDebFromSourceUbuntu.bash script.

Exactly, just wanted to post this as I saw your reply. The package is automatically installed only when building appImage in a Docker container so far. I wonder whether it could be made optional (i.e. package missing = disable all Wayland-related code), but for now it needs to be installed manually as you have done.

The package qt6-base-private-dev is not listed, nor installed as a dependency from the createDebFromSourceUbuntu.bash script.

It probably was installed in 25.10, Avidemux build without issue, but likely was removed by the upgrade to 26.04

Anyway installing the package solved the problem. I suggest adding it to the createDebFromSourceUbuntu.bash script so it gets installed when needed.

Quote from: Ferdi on May 19, 2026, 07:54:36 PMThis version number directory does not exist on my system

A big disclaimer: I don't have a working Ubuntu 26.04 on my PC yet (will probably create a VM as it doesn't seem to run on bare metal where gdm3 fails with NVIDIA driver installed – a combination where Fedora with RPM Fusion just works), but the list of files in qt6-base-private-dev

URL: https://packages.ubuntu.com/resolute/amd64/qt6-base-private-dev/filelist
includes the versioned directory. Will try to reproduce once I have got 26.04 running.

Quote from: judy85805 on May 19, 2026, 08:10:25 AMyoutube video that U decided Not to watch

Sure I watched the video, explained you what was conceptionally wrong both in the video and in your question and provided you with a solution (or rather a workaround for a known limitation of Avidemux). I don't know whether the limitation of being unable to use a single internal or external audio track as a source for multiple output audio tracks has been introduced during the rewrite of the application between the 2.5.x generation and 2.6.x (with future 2.8.2 being a continuation of 2.6) or existed from the very beginning.

Quote from: judy85805 on May 19, 2026, 08:10:25 AMwhere can I get ?

You can find all releases on SourceForge.

When looking at the logfile, at first the qt6 include paths are correctly found.

However later on, another cmake script apparently adds the qt6 version number to the end of that path. This version number directory does not exist on my system causing the qt6 build to fail.

Quote from: eumagga0x2a on May 18, 2026, 12:55:47 PMJust to use clear terminology: this is not about appending audio, which is impossible with Avidemux. This is about adding an external audio track. You would need to either copy the audio file to a different path or duplicate it (on *nix OSes: create a link to the original file under a different name) to be able to re-use it as another external audio track in Avidemux.

Thanks,  I found out in the youtube video that U decided Not to watch that it is version 2.5 - where can I get ?