I had a similar problem than you when trying to set the melodic with command line to 20 dimensions.
I guess it is a really trivial error but still I can't solve it.
I typed:
melodic -i .filelist -o melodic_20.ica -v --nobet --bgthreshold=10 --tr=2 bgimage=bg_image -d 20 --mmthresh 0.5 -a concat
and then in the logfile appears:
(...)
Starting PCA ... done
Start whitening using 36 dimensions ...
retaining 94.6807 percent of the variability
... done
(...)
fsl version: 4.1.7
melodic version: 3.10
Thank you very much in advance
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