IPTV MPEG

Description

Netrounds Test Agents can receive one or several IPTV channels, measuring MPEG TS priority-1 parameters according to ETSI TR 101 290 (Measurement guidelines for DVB systems).

The IPTV MPEG feature quickly gives you a view of IPTV channel quality at the points where you have connected the Test Agents. Using multiple Test Agents lets you monitor quality in different parts of your network. Netrounds will measure and highlight MPEG loss, PCR jitter, rate, packet loss, continuity count error (CC), and any general problems with the stream.

When you start an IPTV MPEG test, the Netrounds Test Agents will join the channels by sending IGMP join messages. Once they receive the streams, the Test Agents will continuously measure quality. Note: Netrounds does not decrypt any of the MPEG streams; its quality measurements are based on the unencrypted MPEG headers only.

It is possible to configure a threshold for the IPTV PAT/PMT receive interval, that is, define how frequently PAT and PMT information should be detected in the received stream. Note that this overrides the default frequency of two PAT/PMT packets per second, as specified in ETSI TR 101 290.

Setting up a test or monitoring

To run IPTV/MPEG measurements you need to have at least one Netrounds Test Agent installed. If you haven't already done the installation, consult our quick start guides for various types of Test Agents in the section Netrounds Test Agents.

Also make sure that you have prepared Netrounds with your IPTV channel list.

Then create a new IPTV MPEG test or monitoring and fill in the mandatory parameters below:

Parameters

Tests only

  • Duration (seconds): The duration of this test step in seconds. Min: 30 s. Max: 604800 s. Default: 60 s.
  • Fail threshold (seconds): The maximum number of errored seconds (ES) that may occur without triggering a fail for this test step. Default: 0.
  • Wait for ready: Time to wait before starting the test. The purpose of inserting a wait is to allow all Test Agents time to come online and acquire good time sync. Min: 1 min. Max: 24 hours. Default: "Don't wait", i.e. zero wait time.

General

  • Clients: Select the Test Agents on which you want to receive one or several IPTV channels.
  • Channels: Select the IPTV channels to monitor from the preset IPTV channel list.

Thresholds for errored seconds (ES)

  • MPEG loss: Maximum tolerated MPEG packet loss (CC errors) per second. Default: 2 packets per second.
  • Jitter: Maximum tolerated jitter (delay variation) in the received streams. Default: 50 ms.
  • PAT/PMT interval (s): Maximum tolerated interval between PAT/PMT transmissions. Min: 0.5 s. Max: 60 s. Default: 0.5 s. Note: PAT/PMT should be received every half-second on a program according to the standards.
  • PID interval (s): Maximum tolerated interval between audio or video PIDs as specified by PMT. Min: 1 s. Max: 60 s. Default: 5 s. Note: On regular audio/video streams, a PID should be received every 5 seconds according to the standards.

Advanced

  • Delayed start (s): (Tests only) Time by which to delay the start of the test within a test step. Default: 0 s.

SLA thresholds (monitorings only)

  • SLA Good: Threshold for good fulfillment of service level agreement. Default: 99.95%.
  • SLA Acceptable: Threshold for acceptable fulfillment of service level agreement. Default: 99.5%.

Result metrics

  • Rate (Mbit/s): The bit rate of the MPEG program stream. 
  • Transport rate (Mbit/s): The bit rate of the MPEG transport stream (MPEG-TS), that is, the rate of the MPEG stream including the overhead from the header of the Transport Stream packet.
  • MPEG loss: MPEG packet loss, calculated from the Continuity_count_error counter in the MPEG stream.
  • PCR jitter (ms): The jitter (delay variation) of the received MPEG stream. Calculated from the timestamps in the Program Clock Reference (PCR) field transmitted in the adaption layer of the MPEG transport stream.
  • RTP jitter, loss, misorders: If the stream contains RTP headers, Netrounds will calculate RTP jitter, loss, and misorders, which are basically the same as the corresponding metrics for IP. Whether or not the stream contains RTP headers depends on the encoder at the head-end.
  • PAT errors: A PAT error is triggered if a Program Allocation Table (PAT) is not received on a multicast group within PAT/PMT interval
  • PMT errors: A PMT error is triggered if a Program Map Table (PMT) is not received on a multicast group within PAT/PMT interval.
  • PID errors: On regular audio/video streams, a frame should be received in every PID interval. If no frame is received within that interval, one PID error is generated for every second that elapses.
  • ES MPEG loss: Number of errored seconds triggered by MPEG loss exceeding the MPEG loss threshold during one second.
  • ES jitter: Number of errored seconds triggered by PCR jitter or RTP jitter exceeding the Jitter threshold.
  • ES invalid stream: An aggregate of PAT, PMT, and PID errors. If any of these types of error is encountered during a second, it is marked as an Invalid stream errored second.
  • ES total: Aggregated errored second percentage, taking into account all types of error.
  • SLA: Service level agreement fulfillment for the test or monitoring: equal to (100 – ES total) %.
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