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python/scripts/aubiocut: add --cut_every_nslices option

--- a/python/scripts/aubiocut

+++ b/python/scripts/aubiocut

@@ -116,6 +116,10 @@

             metavar = "<samples>",

             action = "store", dest = "cut_until_nsamples", default = None,

             help="how many extra samples should be added at the end of each slice")

+    parser.add_option("--cut-every-nslices", type = int,

+            metavar = "<samples>",

+            action = "store", dest = "cut_every_nslices", default = None,

+            help="how many slices should be groupped together at each cut")

     parser.add_option("--cut-until-nslices", type = int,

             metavar = "<slices>",

             action = "store", dest = "cut_until_nslices", default = None,

@@ -186,6 +190,9 @@

         # generate output files

         from aubio.slicing import slice_source_at_stamps

         timestamps_end = None

+        if options.cut_every_nslices:

+            timestamps = timestamps[::options.cut_every_nslices]

+            nstamps = len(timestamps)

         if options.cut_until_nslices and options.cut_until_nsamples:

             print ("warning: using cut_until_nslices, but cut_until_nsamples is set")

         if options.cut_until_nsamples: