Usage
ff_DTW(X, wl = 512, length.out = 20, wn = "hanning", ovlp = 70,
bp = c(0, 22), threshold = 5, img = TRUE, parallel = 1,
path = NULL, img.suffix = "ffDTW", pb = TRUE, clip.edges = TRUE,
window.type = "none", open.end = FALSE, scale = FALSE, ...)