Apply notch filter appropriate number of times based on --motion-filter-order
#1300
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Closes #1272 and closes #1278. Thanks to @cindyhfls for detecting the problem and figuring out the solution.
Changes proposed in this pull request
--motion-filter-order
parameter by 4 instead of 2 when using the "notch" motion filter, asiirnotch
is a second-order filter andfiltfilt
applies the filter both forwards and backwards (equaling 4 total applications).