Tutorial 1: H.261; Procedure - Tektronix MTS4EAV7 Tutorial

Tutorial 1: H.261

Procedure

MTS4EAV7 HEVC / AVC Video and Compressed Audio Analyzer Tutorials
This tutorial shows non-compliance issues with the H.261 standard using temporal
references and graphical analysis.
1. To load the H.261 tutorial, click File > Example files > H.261 stream >
Conference Room. The window title changes to MTS4EA-H.261 Example
- Conference Room, and a warning message appears. (See Figure 1.)
Figure 1: Initial warning message
NOTE.
The H.261 standard states that the temporal reference (TR) value is the
previous TR value + 1 + the number of skipped or non-reference pictures at the
picture clock frequency (PCF). TR is 8 bits only, 0–255, at the standard PCF of
29.97 frames per second. However, if a custom PCF is used, then TR is 10 bits: 8
LSBs are denoted as TR and 2 MSBs are ETR, but they are taken together as a
single 10-bit number.
2. View the warning message elements:
Warning - Indicates that two consecutive temporal references are zero.
Summary - Gives summary information about the stream.
3