Convert 3D video and 2D video to 24 or 48 fps (like The Hobbit) without re-encoding

[maldon]

I was wondering how I can convert a 3D video to 24 fps or 48 fps. I wanted to try this with the Blu-ray of The Hobbit: An Unexpected Journey (3D MVC).

To convert 23.976 2D video to 24 fps without re-encoding I use UsEac3to but with 3D video I understand I can't as there is a different video layer (MVC). I figure that the best option to do this is to use tsMuxeR. After adding the video file I select below "Change fps: 24" in the main video and in the MVC video. There is no option for 48 fps.

I have one question:

Is it correct to use UsEac3to or tsMuxeR to convert 2D and 3D to 24 fps without re-encoding or is there some kind of unwanted anomaly that I am not being able to perceive? I would like to use software that allows me to do this with all the guarantees that it will not produce any artifacts in the resulting video.