Avidemux Forum

Firstly, I love how light and responsive avidemux is and am eager to learn what its running under the hood. 

I tried aviremux in response to shotcut (22.12.21) failing to perform a particular task. In fairness, later versions rectified this, but I am using Win7 on a laptop, and that was the last usable version for Win7.

The task is to re-encode a 1920x1024 video down to 404x720 rectangle (or thereabouts) for mobile screens while panning (transforming) that rectangle to follow the action. I don't want to scale the video down, but to crop the video to the new dimensions. In shotcut, this required keyframes.

I understand aviredux does not do keyframes, but it will crop to the smaller dimension. Is it possible to add keyframe capability... without rewriting the framework?

I noticed there is a "scripting shell" and "custom" option in the toolbar. Have not read up on it yet. Perhaps there is a solution there? Since I've plotted keyframes in Shotcut, I can note their timestamps and add them to a textfile and/or hardcode the rectangular X/Y position into a script. I can also create a programmable function to ease-in/out of keyframes so panning (moving the rectangle) is smooth.

Thanks!

Quote from: 2dachopa on March 21, 2025, 10:21:45 PMThe task is to re-encode a 1920x1024 video down to 404x720 rectangle (or thereabouts) for mobile screens while panning (transforming) that rectangle to follow the action.

No (smooth) panning is currently possible in Avidemux. Setting up a filter chain with dozens of partial zoom filter instances would allow following the action in discrete steps, but would require a lot of editing. Not sure this can be made reasonably scriptable.

Quote from: 2dachopa on March 21, 2025, 10:21:45 PMI don't want to scale the video down, but to crop the video to the new dimensions. In shotcut, this required keyframes.

Not being familiar with Shotcut, this statement makes no sense for me as the meaning of "keyframe" (a picture in a compressed video stream a decoder can directly seek to) in Avidemux is presumably not what you meant here.

Avidemux is probably not the right tool for this task.

Windows 7 is unsupported. I cannot test on this platform to check what works and what doesn't, not mentioning that I don't have time for that.

Try googling Adaptive Cropping. Be aware much of this is AI driven, so Win 7 is unlikely to be supported. There may be some free online services though.