Recorded 8mm film in reverse, now how to get it re-reversed?

[tomvdp]

I was able to recover a 45 year old 8mm film using an old and slightly broken film projector. The projector would only display the film decently if put in reverse, i.e. running backwards from end to start. I then recorded this projection using my camera (Nikon D800). This method worked wonderfully well.
But now I have a 15 minute film that is reversed: it starts with the end, people walk backwards, ...
I thought this would be a trivial thing to fix, yet I cannot find a solution. Obviously I am NOT a video expert.

Is there some kind soul here that can explain what I need to do ?
(If it matters for the reversal process: ideally the movie should also be slowed down a bit.)

Thank you!

[Jean-Baptiste Kempf]

You need a video editor, like virtualdub or the like, not VLC..

[tomvdp]

Thank you for puting me on the right track.
I think I am almost there. Virtualdub, Avisynth, ffinputfilter, ... lots of processing and gigantic files. I never thought it would be so cumbersome.