stf=14 encodes in side by side. Therefore, you can crop the top and bottom border with the crop() command, but not the left and right edges. (If you really want to crop the left and right edges in a single operation, you should encode in Top/Bottom mode, with stf=16.)
Anyway, it's usually not a good idea to crop the 3D movies, as many 3D TVs need the full HD 16:9 resolution to work properly.
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