Analyzing Video Streams - JDS Uniphase HST-3000 User Manual

Chapter 2 IP Video Testing

Analyzing video streams

Analyzing video streams

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The HST-3000 analyzes the video data packet flow at the
packet level. Since the initial video quality is established by
the source material and encoding process at the head end,
and the decoding quality is established by the STB, the effects
of the transport and access networks on the video streams are
the variables requiring analysis. Actual video content
decoding is not performed.
NOTE:
The data connection must be established (indicated by a
solid green Data LED) for video streams to be visible to the
HST and the video statistics screens to show activity.
After the HST-3000 is setup, it can analyze video perfor-
mance. Up to three streams can be simultaneously analyzed
in Terminate mode. In monitor mode, up to 3 simultaneous
streams can be analyzed at one time, with statistics available
for up to 10 previous streams. In addition, the signaling can be
analyzed. To view statistics on another stream, press the
Results soft key then select the stream.
NOTE:
The use of the term "MPEG-2" for the service selection type
is a general term for what has been called an MPEG-2 video
Transport Stream packet as defined in the ISO/IEC 13818
standard. It does not mean or define the compression tech-
nology used in the payload of the transport packet. Thus, if
the broadcast video flow is using the 13818 packet format,
then any compression scheme may be used in the payload
with no impact on the HST. For example, if MPEG-4 com-
pression technology was used in the payload instead of
MPEG-2, the HST would be able to perform as outlined here
in without issue.
HST-3000 IP Video Testing User's Guide