I have another little issue.
This time I can tell for sure, that it is happening in the Taygeta lib - and not in the nVLC part ;-)
I tried to play a m4v video and I noticed, that the aspect ration was wrong.
In VLC itself it was correct. Then I tested your test apps which came with nVLC. In the WinForm implementation it was also correct.
The error happens only in the WPF sample.
Here is an example video:
WinForm (correct aspect ration)
WPF (wrong aspect ration)
Taygeta MainSample (wrong aspect ration)