DMG 3200/3100/3000 – User Manual
Page 212 (306)
remove more detail. A value of ‘0’ is often considered to be a
good compromise.
Video Buffer Verifier
Max Delay
This sets the size of the VBV buffer. The value should be left at
the default (1000ms). Reducing the VBV buffer is a technique
often used to lower the video delay, but it can seriously
compromise video quality by forcing excessive quantisation to
accommodate I-frames. This can cause poor references, poor
video and I frame pulsing artefacts.
IDR Frequency
Sets how often I frames shall be converted to IDR
(Instantaneous Decoder Refresh) frames. IDR points are intra
frames without past references. The IDR frequency can be
important for decoders offering fast trick play (fast forward /
rewind).
8.5 Universal Broadcast Transcoder Configuration
The Universal Broadcast Transcoder can transcode up to 16 SD service without PIP, 12 SD
services with PIP or 4 HD/SD services with PIP. The transcoder can take any conventional DVB
service (HD/SD, MPEG-2 or H264) as input. The module consists of four separate transcoder
blocks A, B, C and D.
On the Coders->Setup Hardware page, the Universal Broadcast Transcoder can be configured
either HD or SD mode per block. Once configured, the transcoded services will appear as
SPTS/MPTS inputs to the unit. These services can be output through an output interface just
like any other service.
Figure 8.27 -
Universal Transcoder- dense broadcast setup hardware page
Slot
Specifies the slot of Universal Transcoder- dense broadcast
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