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This is actualy the only way, and even then it would only work on windows/macHmm, I think the only way to sort of do this is to get a 3DS capture card.
Might be really expensive though...
If we're talking about ways that work on computers, then a capture card isn't the only solution. NTR is also a solution, as shown here (3DS screens streamed to PC, then recorded from the PC). Tried it on Windows and Linux but not OS X (and yeah btw, you can't really say "windows/mac" since "Windows" is an OS and "mac" is not, so the combination isn't homogeneous).This is actualy the only way, and even then it would only work on windows/mac