Avidemux opens RAW 16bpc videos as black

[Dmitry87]

I have AVI files with codecs:
- Y16 - raw grayscale uint16, similar to Y8 (Y800), but 16bit.
- BYR2 - the same as Y16 but with Bayer pattern.
- b64a - like Y16, but 4 colors (Apple 64-bit ARGB)
They are produced by software on Hyundai and Kay cars for videos from built-in-vehicle cameras. There are 12 bit/color sensors installed.
Avidemux opens them as black videos. Is there a way to open properly such videos in Avidemux?, do I need to install additional codecs?

b64a file sample (VirtualDub2):
http://www.mediafire.com/download/6jgx43lgx5xaxa7/b64a.avi
As these are RAW formats without any compression, would it be possible to add support for them to Avidemux without using external decoders? Both Y16 and BYR2 could be opened as 16bit grayscale videos and for b64a it is additional 3 16bit components per pixel.

https://drive.google.com/file/d/17Yzj3H3PMN5siHoWqyuaPMFc7uiCWwJj/view?usp=sharing
https://drive.google.com/file/d/1wrheF3d7wlCLAF_ikc3rmmPmX0Rd3z2m/view?usp=sharing
https://drive.google.com/file/d/1o4Ghcdiue16vx-VNJdUyynnFQFOk-TVf/view?usp=sharing