Table 6.3 Test Patterns
Test Pattern
Black
Color bars
Moving object
Slate
Notes: On loss of video the VCM can be configured to produce one of the test
patterns or turn off the video component.
If the PID is removed from the output, a Transport Stream analyzer device
will report the removed PID as a ghost PID, because the reference to it is
still transmitted in the Program Map Table of the MPEG Program Specific
Information.
6.2.1.5 Impairment Reduction
The video pre-processor provides a range of configurable tools to improve
subjective quality. For H.264 encoding, the perceived image quality is further
enhanced by utilizing a de-blocking filter in the feedback loop, which is also
configurable.
Table 6.4 AVP 4000 Video Input and Pre-processing Parameters
Parameter Optimum PSNR Setting Optimum Visual Setting
Adaptive Pre-Processing Filter OFF ON
The APF is especially useful in low bit rate
MPEG-2 encoding to prevent excessive
blocking, due to the lack of an in-loop deblocking
filter within the standard, unlike in H.264.
However, the APF may also benefit H.264
encoding at low bit rates.
MCTRF OFF Default
This filter is designed to be able to remove
random input noise (such as thermal camera
noise) without blurring motion that may be
present in the source video.
Horizontal Bandwidth 100%
(Pass-thru)
90%
Half-line Removal (PAL) OFF ON
Profile Always use High Profile for H.264
H.264 High Profile Level 4.0 (SD)
H.264 High Profile Level 4.0 (HD)
Resolution Full i.e.
1080i:1920x1080
720p: 1280x720
PAL: 720x576
NTSC: 720x480
Full, although in very low bit rate scenarios you
can set a lower horizontal resolution to avoid
excessive blocking at the expense of increased
softness.
Typically dictated by customer requirements.
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