Avoid plotting data of different length in rtp log plotting tool.

webrtc/tools/py_event_log_analyzer/rtp_analyzer.py

 #  Copyright (c) 2016 The WebRTC project authors. All Rights Reserved.
 #
 #  Use of this source code is governed by a BSD-style license
 #  that can be found in the LICENSE file in the root of the source
 #  tree. An additional intellectual property rights grant can be found
 #  in the file PATENTS.  All contributing project authors may
 #  be found in the AUTHORS file in the root of the source tree.
 
 """Displays statistics and plots graphs from RTC protobuf dump."""
 
@@ skipping 241 matching lines @@
     start_ms = self.data_points[0].real_send_time_ms
     stop_ms = self.data_points[-1].real_send_time_ms
     time_axis = numpy.arange(start_ms / 1000, stop_ms / 1000,
                              RTPStatistics.PLOT_RESOLUTION_MS / 1000)
 
     delay = calculate_delay(start_ms, stop_ms,
                             RTPStatistics.PLOT_RESOLUTION_MS,
                             self.data_points)
 
     plt.figure(1)
-    plt.plot(time_axis, delay)
+    plt.plot(time_axis, delay[:len(time_axis)])
     plt.xlabel("Send time [s]")
     plt.ylabel("Relative transport delay [ms]")
 
     plt.figure(2)
     plt.plot(time_axis[:len(self.smooth_bw_kbps)], self.smooth_bw_kbps)
     plt.xlabel("Send time [s]")
     plt.ylabel("Bandwidth [kbps]")
 
     plt.show()
 
@@ skipping 58 matching lines @@
   print("Statistics:")
   rtp_stats.print_sequence_number_statistics()
   rtp_stats.estimate_frequency(options.query_sample_rate)
   rtp_stats.print_duration_statistics()
   rtp_stats.remove_reordered()
   rtp_stats.compute_bandwidth()
   rtp_stats.plot_statistics()
 
 if __name__ == "__main__":
   main()