IPTV Result Video (Page #2) -
displays the
Stream Rate
results;
Table provides individual bit rate statistics for each stream;
Total is the total number of bytes related to the Video, Audio and Data payloads
Video is the number of packets classified as video packets
Audio is the number of packets classified as audio packets
Data is the number of packets classified as data packets
Other is the number of packets classified as unknown packets
IPTV Result Video (Page #3) -
displays the
Packet Jitter
results;
Packet Jitter displayed in milliseconds.
Current is the current jitter value
Max is the maximum jitter value
Note: Packet Jitter
This measurement is based on the data packet inter-arrival time which is a measure of packet arrival
variance. Packet jitter affects packet arrival throughout the network. Variations lead to buffer under overflows
at the receiving equipment e.g. STB. Jitter impacts the way packets are handled at various net work
elements i.e. If the jitter is too high, packet loss will increase as queuing software tries to load balance traffic
at network elements. Packet jitter should not be confused with PCR jitter (described below). When Packet
jitter is present, the cause is normally related to the Ethernet physical layer. When PCR jitter is present, then
the cause is most likely related to the program flow and could be related to an encoder not performing to
specification.
IPTV Results - Video QOS
IPTV Results - Video Transport
IPTV Result Video (Page #4) -
displays the
Quality of Service (QOS)
results;
PCR Clock
- Presence of 27MHz Program Clock Reference
PCR Jitter
- PCR deviation in (ms)
MPEG Packet Loss
- continuity error (%)
Latency
- the time to complete a program change measured in milliseconds (ms)
Note: Program Clock Reference (PCR)
MPEG TS normally contain a built-in timing packet known as the Program Clock Reference (PCR).
Recovering the 27 MHz clock at the decoder end of the transmission system is necessary to re-create the
video signal. The PCR values need to be correct at the signal origin and should not be distorted along the
transmission path to a point where decoding the compressed signal becomes problematic. Measuring the
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