It is ok in 2.7.0
make sure you select "PCM" as audio codec when saving , and not copy
Try with a nightly (http://avidemux.org/nightly/win64)
It might be normal. I did not check yet, but each mp4 file is supposed to have a...
XviDs are green when width more than 710
Fixed, it was bad colorspace management
Ticket moved from /p/avidemux/bugs/34/
Avidemux sets wrong tag (at least for XviD)