Can't use nvstitch_sample in VRworks 360 Video SDK if audio is used ...!

VRWorks 360 Stitching Sample - nvstitch_sample

It works fine without audio but the supplied (unmodified) sample configs/video files generate an “Error at line 185 - Unsupported Codec” when trying to stitch with ‘–audio’ parameter present in run.bat

… everything is set to AAC so should work as FDKAAC.DLL is in the included PATH (at …\External)

has anybody got this to work …?