How to export a .AVI as a sequence of images in Avidemux I'm trying to simply export every frame of an .AVI movie as a sequence of images (.tiff) or a folder of .jpeg images.

This web page says I can simply select all frames in Avidemux, then go to:

File --> Save --> Save JPEG image

But that only ends up saving one frame instead of the entire selection. Any thoughts? 

I'm using Avidemux version 2.6.10
You need to downgrade to 2.5 since 2.6 does not support image sequence export.

Alternatively, you could download FFmpeg and run

ffmpeg -i input.avi -q:v 1 in%d.jpg

ffmpeg -i input.avi in%d.tif