Many thanks, tomtastic and Bob, for answering.
Meanwhile I tested Bino for playing the MTS videos on my Macbook, but unfortunately it didn't and gave an error message like "picture size in channel 2 is wrong". But I had also found 5KPlayer (https://www.5kplayer.com
) which could play the files. For some minutes I managed even to send that via an AppleDisplayPort->HDMI adapter to my LG 3D TV, and it appeared to be real 3D. But unfortunately the adapter broke somehow, so I could not and cannot conduct extensive tests.
Your remark, Bob, made me try the MTS via a USB stick plugged into the LG TV, and it ran fine in 3D.
But overall I have to agree to your pessimistic remark:
Originally Posted by 3DBob
Good luck, but Apple/Mac is probably not the way to go here.
You're probably very right, but I don't want to move to Android and Windows (from which I came 12 years ago).
Through all todays failures I'm somewhat disappointed and exhausted, so I feel tempted to let my family video archive be again just that: an archive to which I don't come back for the next couple of years. But of course this runs the risk that at some time no software will recognize MTS files anymore...
I could try to become a hero and take handbrake (with which I feel reasonably familiar) for converting everything to an mp4 file, e.g. with 3840x1080 SBS. But will that be still recognized in 10 years?