reduce the default number of samples

having more samples than selected frames should be explicitly asked by the user with the -s argument

vcsi/vcsi.py

@@ -920,7 +920,7 @@ def main():
         help="number of samples",
         dest="num_samples",
         type=int,
-        default=50)
+        default=None)
     parser.add_argument(
         "-t", "--show-timestamp",
         action="store_true",
@@ -1068,6 +1068,9 @@ def process_file(path, args):
     else:
         args.grid = mxn_type("%sx%s" % (1, args.num_selected))
 
+    if args.num_samples is None:
+        args.num_samples = args.num_selected
+
     if args.delay_percent is not None:
         args.start_delay_percent = args.delay_percent
         args.end_delay_percent = args.delay_percent