SwiftFin on AppleTV 4- Can't fast forward, doesn't save progress

[johanarens]

I've tried with a bunch of MKV files I owned, same behaviour.

I can see the progress bar updating while playing, I can fast forward but if I stop and leave this video and come back again, it doesn't remind where it was left.

I did convert one of my M4V files to MKV (not with the method you mentioned, I've got an error from FFMEG, I have used HandBrake to convert it.
But this is the same result.