This YouTube video (http://thisyoutubevideo) pretty well shows what I'm trying to do; use Avidemux to add an image on top of my video where desired. But although I can add the image I have no control over the duration - it extends through the whole thing. Clicking on the "partial" button for the logo filter has no effect; I can only configure the image, not set a length of time for it to appear as shown in the referenced tutorial. Any suggestions would be appreciated!
With 2.6 the partial filter only works when the video filter doesn't have some time dependancy.
I would think that just overlaying a logo should be able to be done with the partial filter.
If the codec is not AVC then try to use 2.5.6.