Atec Tektronix-MTS300 - Manual (Page 4)

MPEG Test System
MTS300
The sequence header can be viewed along
with the extensions. The picture rate, chroma
format and the video type (NTSC, PAL, etc.)
appear in the status bar when the sequence
headers are displayed. The stream can be run
through with the option of analysis of the
stream at picture level or at the macroblock
level. When analyzing the group of pictures
(GOP), it is possible to randomly access any
picture from within the group, view the picture
type, spectrum and display picture size plots.
The user can zoom in on the picture to see
details at the slice or macroblock levels or
view the encoded picture. Picture player (see
Figure 3) can be operated until degradation in
quality is seen, the picture paused and the
details reviewed down to the macroblock
level. An easy mechanism is provided to
switch between the picture display and the
data analysis windows.
Macroblocks can be selected and detailed
coding investigated. The picture analysis can
be performed with special displays of quantizer
scale distribution, slice size distribution,
macroblock-size spectrum and motion
vector plots.
Quantizer matrices can be downloaded for
any picture, at most four matrices, namely
intra-quantizer matrix, non-intra-quantizer
matrix, chroma intra-quantizer and chroma
non-intra-quantizer matrix.
The picture coding extension is always
displayed, while the other picture extensions
are displayed on tabbed folders; these are
copyright extension, picture display extension
(PDE), picture spatial scalable extension
(PSSE) and picture temporal scalable exten-
sion (PTSE). The B and P frame motion vector
displays allow you to select Macroblock Intra,
pattern motion backward and forward together
with macroblock quantization, quantizer scale
DCT type and motion vector format.
Comprehensive error logging is provided
during stream analysis and selectable error
filters are available. There is also an automated
“regression” test mode that can save data
from selected fields to report files for
viewing later.
The audio analysis capability includes
navigation to any audio frame and viewing
its details, header, frame data plots. Audio
descriptors are interpreted and displayed
in higher level streams and validated against
the stream.
MPEG Test • www.tektronix.com/video_audio 4
Figure 1. Advanced ES Analyzer Motion Vector display.
Figure 3. Advanced ES Analyzer picture player.
Figure 2. Enlarged section showing
Macroblocks and associated Motion
Vectors using Zoom Window.