Avidemux Forum

Old post but no definitive solution added,

For those having similar issues. If the video does not save with a thumbnail and duration, you might need to make sure that you have set both the A starting point and the B ending point. This fixed it for me.

Video -> Copy
Audio -> Copy
Output -> MP4 Muxer --> Configure -> Force aspect ratio --> DAR: 4:3

Otherwise, you can do similar with ffmpeg.

That is lossless (so no need to re-encode).

How a player interprets that may vary, but try it & see if it works for you.

(And any decent player should have rather simple method of interactively changing aspect ratio for any "out of wack" video.)

Rana,
Yes re-encoding is the cleanest solution that works for every playback.

There is a way to adjust the Aspect Ratio for 3rd party players like VLC, but it does not work for Browser or TV app playback.  The math is a little crazy to figure out, because the settings can only be whole numbers.  So for any aspect ratio change you have to go high enough with numbers to no longer need decimal values.

Online Calculator is here: https://www.producerelease.com/blu-ray/parcalc.htm#wrapprcalc

This adjustment works only for VLC or similar 3rd party app players.

I have a small workflow suggestion: I think by default not only the current selection should be exported. It happened multiple times that when i trimmed my recordings i failed to recognize i still had a selection in the timeline, then after deleting the original file i lost some content. When extracting gaming moments in small clips for example, i don't want to double check every time because it's not important enough, but still an annoying loss.

So i think there should be a setting for it, or a separate option/hotkey for "save selection", and "save" having the standard behavior to export the entire timeline.

thanks for the good work.

If you re-encode, use Filters/Transform/swsResize. Untick "Lock Aspect Ratio".
Set either width to 568  OR  height to 640. The former will reduce the size, the later will enlarge it.

I tried a few times to paste in the file details from AviDemux and MediaInfo, but I was getting this AntiSpam error: "CleanTalk: *** Forbidden. Message seems to be spam. Anti-Spam by CleanTalk. ***"

I have a 854x426 H264 .mp4 video that plays onscreen in all of the Windows 11 players I've tried (Pot, VLC, WMP, MPC, etc.) as if it was 16:9, when the video was intended to be 4:3, since everything in the video is stretched horizontally (everything looks wider/fatter than expected). If I open POT Player and tell it to manually force the aspect ratio to 4:3 it displays fine.

Is there a way to use AviDemux to fix this? I don't need to change anything else about the video (audio, resolution, etc.), except to make it show onscreen correctly. I'm happy to change the container file format. I've tried using MKV Muxer output with Force Aspect Ratio (DAR) of 4:3, re-encoding to HEVC, and a few other things, but nothing fixed the issue yet. This is with the latest Windows development release 2.8.2, but I have the same issue with 2.8.1.

I'm new to video encoding and AviDemux. I have only used it to crop videos before this.

Bonjour,

J'utilise un avidemux master 20-01-2025, tout fonctionne très très bien, mais je ne peux pas compiler sans l'option "debug" donc j'ai un fichier idxb qui est créer a chaque utilisation.

Je sais qu'une telle demande est tres égoiste mais j'ai un  igp intel haswell donc directX 11 seulement, pas de vulkan et ffmpeg 7 ect..
Voila merci à Mean et eumagga0x2a pour leur travail.

un utilisateur de Linux Slackware.

Hi, I would like this feature as well. I would extend it to play in loop. I often create small clips from video and it would be game changer to see the clip looping before I export it.

Thanks

restore all gcc g++ and cpp now works, was linked to clang installing "clang-as-default", now works.
Thanks