Fix small mistakes

scripts/txtime_stats.py

@@ -26,9 +26,12 @@ import csv
 import struct
 import math
 import sys
+import json
 
 def compute_offsets_stats(file_path, interval):
 
+    interval = int(interval)
+
     measure_set = {}
     measure_set["measure_type"] = "packet_jitter_tcpdump"
     measure_set["props_names"] = ["packet_jitter_tcpdump"]
@@ -51,7 +54,7 @@ def compute_offsets_stats(file_path, interval):
             if i > 0:
                 val = arrival_tstamp - prev_tstamp
                 jitter = (val - interval) / 1000
-                histogram_index = 1000 + jitter
+                histogram_index = int(1000 + jitter)
                 if histogram_index < 0 or histogram_index > 2000:
                     print("jitter too high: {}\n".format(jitter))
                 else:
@@ -70,7 +73,7 @@ def compute_offsets_stats(file_path, interval):
     measure_set["props"] = [histogram]
 
     data = {}
-    data["measure_sets"] = [{measure_set}]
+    data["measure_sets"] = [{"measure_sets": measure_set}]
 
     path = "tcpdump_histogram"