Tutorial 9: MPEG-4 and H.264/AVC buffer analysis
Tutorial 9: MPEG-4 and H.264/AVC buffer analysis
This tutorial covers the following:
Buffer analysis in real-time (VBV, VCV, VMV of MPEG-4 ES).
Information provided - values, over
fl
ow/under
fl
ow indications.
Icon controls for navigation through the graphs.
Buffer conformance errors/alerts.
Graphs.
Error dialog boxes.
Achieving conformance.
Altering the buffer parameters and seeing the effect in the graph.
Adjusting values to prevent over
fl
ow.
HRD buffer analysis in H.264/AVC.
This tutorial requires that you have completed the previous tutorials, and that
you know how to:
Play, stop, step forward, and fast forward a video.
Use and interpret the alert messages.
This tutorial also requires that you already understand the principles of buffer
analysis/conformance (VBV, VCV, VMV) in MPEG-4 and H.264/AVC (HRD).
The following table provides the functions of each Buffer Analysis toolbar icon.
(See Table 4.)
Table 4: Buffer analysis icons
Icon
Function
Zoom in (+) and zoom out (-) centered on the window; affected by the
Lock X / Y icons.
Fit all data into window.
Go to origin (zero), which is the start of the video sequence.
Lock X/Y zoom in/out and scrolling/panning. When the Lock Y button is
pressed, zoom in and zoom out and scroll/pan only affect the X-direction.
This allows you to keep a useful vertical scale, while still viewing the length
of the video sequence.
Autoscroll;
fi
ll the analysis data in real time as the video is being decoded
and scroll the window to the right.
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MTS4EAV7 HEVC / AVC Video and Compressed Audio Analyzer Tutorials