Update docs and detection wrapper to fix #1232.

Author: chriski777

suite2p/detection/detect.py

@@ -166,8 +166,7 @@ def detection_wrapper(f_reg, diameter=[12., 12.], tau=1., fs=30, meanImg_chan2=N
 
     if mov is None:
         nbins = settings["nbins"]
-        bin_size = int(max(1, n_frames // nbins, np.round(tau * fs)))
-        #bin_size = int(max(1, np.round(tau * fs)))
+        bin_size = settings.get("bin_size") or int(max(1, n_frames // nbins, np.round(tau * fs)))
         logger.info("Binning movie in chunks of %2.2d frames" % bin_size)
         mov = bin_movie(f_reg, bin_size, yrange=yrange, xrange=xrange,
                         badframes=badframes, nbins=nbins)

suite2p/parameters.py

@@ -544,7 +544,7 @@
             "min": 1,
             "max": np.inf,
             "default": None,
-            "description": "Size of bins for cell detection (default is tau * fs).",
+            "description": "Size of bins for cell detection. If None, computed as max(1, nframes // nbins, round(tau * fs)), where nframes is the total number of frames in the registered movie.",
         },
         "highpass_time": {
             "gui_name": "Highpass time",