Avidemux Forum

Well you can do that, in a round about way - perhaps*.

*Perhaps, depending on Output Format.  Like mp4, mkv, but not flv...


Output Format
Configure -> Force aspect ratio --> Derived from display width


At that point, you need to set the Display Width to a number that "works".

In a recent video, output A/R was coming out wrong, & that had to do with the (oh, I'll probably get the terminology wrong, but...) DAR.
The DAR was weird.  So I took the expected Display Width, then divided that by the DAR (as reported by MediaInfo).

(I think that was the deal.)

So lets say Media Info showed DAR to be 1.3 (non-square pixels or whatnot).
So I took the expected Display Width, say 480, then divided that by 1.3, & used that value, 369, as the Display Width setting in Avidemux.

With that the output file A/R was as wanted (or at least close enough, given rounding).


(Again, I may have terminology wrong, or my numbers could be wrong, but the basic premise did work out.)

An official Qt5 Windows version would be great. Why switch when it brings downgrade in features and also in supported platforms...

If you fancy cross-compiling Avidemux for Windows from the latest git master yourself, the resulting Qt5 build should have the progress indicator on taskbar button again (the relevant definition is now set).

You need Linux (preferably Fedora or latest Debian stable) installed (a VM should suffice) with at least 8 GiB of available memory and 16 GiB free storage for that. The howto is in parts (especially regarding description of applied MXE patches) outdated, but mainly valid.

Hello,
I notice that the Avidemux window is gradually coming to resemble the version from December 12, 2024, which offered better visual comfort.
However, the progress bar (timeline) remains very mediocre, featuring a circle and scale markings that are unpleasant to work with.
Is this a consequence of Qt6, or simply a deliberate design change that—in my opinion—is a complete failure?
Thanks nonetheless to the developers for continuing to improve this very handy tool.

I am not optimistic about a chance to get this implemented as FFmpeg libraries libavcodec and libavutil Avidemux uses to decode HEVC (and most other video codecs) don't pass the distinction keyframe vs IDR to decoded pictures.

The "non-IDR recovery points" warning is just a warning to reflect poor guesswork in libavcodec when dealing with POC discontinuities, i.e. if the target video player is not FFmpeg-based, the chances are high that it will play such streams just fine.

The presence of IDR frames in an open-GOP H.264 or HEVC stream is not guaranteed at all, and even if present, they may be very far apart (minutes or even hours apart).

Calling in the script console

ed = Editor()
for frame in range(0, 1000):
    ed.printFrameInfo(frame)
will dump raw info from the demuxer about the first 1000 (replace 0 and 1000 with different integer values if desired) frames to Avidemux log (admlog.txt in %localappdata%\avidemux on Windows). Search the log for occurences of the "Flags 0110" string that identifies an IDR frame and for "Flags 0010" that identifies merely a keyframe to get an impression of the frequency of IDR frames in the stream.

What a pity, thats bad news.

Oh well, hopefully oneday someone will bring the progressbar back somehow.

Thank you for the explanation eumagga

LG MiMau

Unfortunately, Qt has removed this functionality (QWinTaskbarButton class and friends) in Qt6 without replacement. Our bug is just that QT_HAS_WINEXTRA is never defined, even if we build against Qt5 with the required QtWinExtras module present.

As Avidemux has switched to Qt6 for Windows as well, this nice feature has been lost.

Hi all,

please would it be possible to add the progressbar on windows taskbar, it worked on older avidemux versions, but in 2.8.2 it is missing again, and its frustrating to see just black instead of progress

Wäre es bitte möglich, den Fortschrittsbalken in der Windows Taskbar in Avidemux 2.8.2 wiederherzustellen, es hat in älteren Versionen funktioniert.

Could it be done just like here maybe: https://avidemux.org/smif/index.php/topic,16490.msg72924.html

Thanks very much for your help
LG MiMau

However, I've been using Avidemux to edit HEVC (H.265) sources and ran into the "non-IDR recovery points" warning when cutting at what the keyframe navigation buttons identified as a keyframe. As I understand it, HEVC allows CRA/recovery-point frames that look like keyframes but aren't true IDR frames, and Avidemux's next/previous-keyframe navigation doesn't currently distinguish between the two — so it's easy to land on a non-IDR point without realizing it, risking corrupted frame reordering in copy-mode cuts.

It would be a great addition to have an option (even a toggle) for keyframe navigation to jump specifically to true IDR frames for HEVC sources, rather than any I-frame-type frame. This would make it much easier to choose safe, reliably cuttable points without needing to cross-reference external tools first.

Thanks for all the work on Avidemux — it's been a genuinely useful tool for years. Avidemux rules!

Quote from: eumagga0x2a on July 30, 2026, 02:44:12 PM

Quote from: Rainman74 on June 16, 2026, 10:50:05 AM@eumagga0x2a Why do the current nightly builds no longer support NVENC? This unfortunately renders them unusable for me.

Should be fixed in the 260729 build.

Thank you very much!