I'm not having much success converting 3D clips into DCP.  I have learned that some clips are simply 2D versions of 3D as you mentioned below and don't work.  I have found some 3D clips that are 3D and have two panes of view, Left eye and Right eye.  I have not successfully converted one of these yet.  The file format is .m2ts like this one, https://www.demolandia.net/downloads.php?id=67931465

Once I was able to successfully complete a conversion without errors, but when I played it back from the DCP format, it played with two separate panes showing, left & right eye.  What am I not doing, or not understanding with these 3D trailers?

I tried it and it seems the file is no problem (3d-lg-sports-highlight-(www.demolandia.net).m2ts)

- Create a new project
- add m2TS file
- under Content ->Video, choose ‚3D left/right‘

If you play preview already now, you should see the image stretched properly in the preview area, and while playing, you see a ‚jittering image‘, L and R plays frame consecutive.

Now, under DCP make a checkbox at ‚Video‘ - ‚3D'

The Left Eye/Right Eye selector will then become active below the preview image, and you can switch between left eye only and right eye only for preview. And the jitter goes away. Then hit ‚Make DCP‘.

So, in short words - you need to tell DCP-o-matic which 3D format your source is, and tell DCP-o-matic you actually want to create a 3D DCP.

- Carsten