Will look into it.
Related question: Do you by change know how to properly signal 30000/1001 fps interlaced using mkvmerge?
Using '--default-duration "0:29.97i"' and '--default-duration "0:30000/1001i"' both result in:
indicating that the container indication is not what I want. 
Got it, using 30i does the job.
Cu Selur
Related question: Do you by change know how to properly signal 30000/1001 fps interlaced using mkvmerge?
Using '--default-duration "0:29.97i"' and '--default-duration "0:30000/1001i"' both result in:
Frame rate : 29.970 (29970/1000) FPS <- container
Original frame rate : 29.970 (30000/1001) FPS <- stream

Got it, using 30i does the job.
Cu Selur
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Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.
Dev versions are in the 'experimental'-folder of my GoogleDrive, which is linked on the download page.