MGW Diamond
Multi-Channel HEVC and H.264 Portable Encoder
User Manual, Version 1.6
29
Processing Section
Video Parameters Description
Total Bit-Rate
(Mbps)
Enter the
Total
bitrate value in Mbps
Total Bit-Rate and Max in Mbps must be filled out for Capped VBR.
Refer to
Rate Control
below for information about each mode.
Allocation within the stream for video/ audio bitrate, metadata and
transport overhead is automatically calculated by the encoder to match
your specific Total Bitrate. The algorithm will maximize allocation for video
payload after accommodating for the specified audio bit rate and metadata
bandwidth set in the System page.
On-the-fly bit rate change:
MGW Diamond is able to apply changes to
the desired stream bit-rate while live streaming is in progress, without
stopping the video service. When required, enter the new value in the
Total field. Click Apply - the bitrate is adjusted on-the-fly. Note that not all
IPTV decoders can handle on-the-fly bit-rate changes and may require
stopping and starting the decoding process to recover the video stream
after applying the change.
Encode Video
Select the box to enable video encoding.
Rate Control
Select either CBR (Constant Bitrate - which is the default) or Capped VBR
(Variable Bitrate)
•
CBR
–
constant bit rate. The specified value is used as the total. Audio
bit rate, streaming protocol overhead and Metadata bandwidth are
deducted from the specified value and the remaining bandwidth is
allocated towards the compressed video data.
•
Capped VBR
–
variable bit rate with a cap. The Max value is used to
set a ceiling not to be exceeded by the stream. Bandwidth utilization
below the Max is dynamically managed by the encoder based on the
complexity of the content, amount of motion and range of colors
detected during the session.
Within LAN environment, Capped VBR can be used for best end to end
latency. Ensure to set a high Max bitrate value and to turn off
Traffic
Shaping.
