Here's a link to a WMV file using the WMV3 codec that doesn't render correctly for me using Avidemux 2.7.2 - Release:
https://1drv.ms/v/s!AtRWanx5i6MM9xFkFxvVGSYDvcwF
In fact, I haven't had any luck rendering any WMV files employing the WMV3 codec.
It is a known problem, please use the VC++ build with the Asf demuxer fixed: https://avidemux.org/nightly/vsWin64/ (https://avidemux.org/nightly/vsWin64/), the file name is "Avidemux_2.7.2 VC++ 64bits .exe" (with a space between "64bits" and ".exe".
Thanks--that worked perfectly!
This is a good example why moving to Visual C++ on Windows is a good thing – gcc is too forgiving. The mistake in the code (a variable could be used uninitialized in some circumstances) didn't cause any misbehavior on Linux, macOS and on Windows with MinGW builds.