Imagine the following MPEG-2 Transport Stream being generated by an encoder. The
TS contains two PIDs (50 and 51) and the Continuity Counter (CC) values are
continuous for each PID since there are no packets missing.
When the Transport Stream reaches our imaginary head-end some packets (those with
red frame) have been lost (maybe due to a bad satellite connection). Our IP-Streamer
packs 7 and 7 MPEG-2 TS packets into each UDP-frame (mapping is 7TS/UDP) and the
resulting frames may look like:
Multicast packet 1:
Multicast packet 2:
....
The probe’s response to this multicast is summarised in the following table:
Sequence Effect
UDP packet #1 (7 MPEG2 TS packets):
PID 50: 12, 13, 14, 15
PID 51: 1, 2, 4, 5, 8
PID 51 has 2 CC discontinuities of 2 (2
4) and 3 (5
8)
Monitoring page:
CCerr:+2
UDP packet #2 (7 MPEG2 TS packets):
PID 50: 4, 5, 6, 7
PID 51: 9, 10, 11
PID 50 has 1 CC discontinuity of 6 (13
4)
Monitoring page:
CCerr:+1
If no more CC-errors for at least 1 second
Alarms & events:
CC skips:9 discontinuities:3
Depending on the thresholds you may
also get:
MLR >= warning-threshold
(9 >= 1)
There were 9 TS packets missing (with red frame) and the alarm reflects this.
PROBE USERS' MANUAL VERSION 5.0
2014 © BRIDGE Technologies Co AS - Bentsebrugata 20 - N-0476 Oslo, Norway - tel: +47 22 38 51 00
-
www.bridgetech.tv
250
PID: 50
CC: 12
PID: 51
CC: 1
PID: 50
CC: 13
PID: 51
CC: 2
PID: 50
CC: 14
PID: 51
CC: 3
PID: 50
CC: 15
PID: 51
CC: 4
...
PID: 50
CC: 0
PID: 51
CC: 5
PID: 50
CC: 1
PID: 51
CC: 6
PID: 50
CC: 2
PID: 51
CC: 7
PID: 50
CC: 3
PID: 51
CC: 8
PID: 50
CC: 4
PID: 51
CC: 9
PID: 50
CC: 5
PID: 51
CC: 10
PID: 50
CC: 6
PID: 51
CC: 11
PID: 50
CC: 7
PID: 51
CC: 12
PID: 50
CC: 8
PID: 51
CC: 13
PID: 50
CC: 9
PID: 51
CC: 14
PID: 50
CC: 10
PID: 51
CC: 15
...
PID: 50
CC: 12
PID: 50
CC: 13
PID: 50
CC: 4
PID: 51
CC: 1
PID: 51
CC: 2
PID: 51
CC: 4
PID: 51
CC: 5
PID: 50
CC: 5
PID: 50
CC: 6
PID: 50
CC: 7
PID: 51
CC: 8
PID: 51
CC: 9
PID: 51
CC: 10
PID: 51
CC: 11