DMG 3200/3100/3000 – User Manual
Page 188 (306)
Horizontal Rescale
The horizontal resolution (pixels per line) is defined by the selected
video format, but can be reduced. The available options depend on
the selected video format on the Source Tab. Reducing horizontal
resolution will make it possible to use lower bitrates when encoding
since resolution is reduced before encoding.
Pre-Deblocking
Strength
The Pre-Deblocking filter attempts to smoothen macro block edges
introduced by (MPEG) encoders earlier in the chain. The deblocking
filter applies a “smoothing” effect to the incoming video. Its purpose
is to blend in sharp, high-frequency (sharp edged) blocking artefacts
to make them less visible. Too much filtering will make the images
“soft”.
MCTF Strength
MCTF (Motion Compensated Temporal Filter) is a filter that can be
used to remove noise in the incoming video signal. It recommended
to only use MCTF on source signals with a significant noise
problem, or when extremely low encoder bitrates are configured
Skin Tone
Detection
When enabled, the encoder detects portions of the video containing
skin tones and may increases the subjective video quality.
8.2.3 Audio Parameters
On the encoder module, there are one (for SD mode) or two (for HD mode) general purpose
audio encoders per channel. These channels support MPEG-1, AAC-LC, HE-AACv1 and HE-
AACv2 encoding and AC-3 (Dolby Digital) pass through. In addition there are up to 12 MPEG-1
encoders or 4 AAC-LC encoders that can be distributed among the channels on a board. A
mixture of MPEG-1 and AAC encoders are allowed per board and this is outlined in the table
below.
All audio encoders can receive embedded PCM audio from the SDI signal. The embedded
source pair can be copied to more than one audio encoder. The various parameters that are
configurable for the codecs are as follows:
MPEG-1 encoder
Bitrate
64-384 kbps (Stereo) (Hardware encoder 0/1)
32-384 kbps (Stereo) (Software encoder 2+)32-192 kbps
Channel Mode
Mono
Dual mono (from same pair)
To Next Page
Loading...