Ericsson AVP 1000 1RU, Reference Manual, Page: 338 / 508

Advanced Video Processing and Networking
6-18
EN/LZT 790 0023/1 R16A
6.8.1.2 Low Delay Buffer Mode (CE-x, CE-xA, CE-a and CE-HEVC)
The module supports a Low Delay buffer mode. Depending on video encoding
parameters, this can reduce the encode delay to 350 ms (for performance summary
see table below), but will have an impact on video quality.
Parameters that primarily impact both delay and quality are the GOP Structure and
the Scene Cut Detection. Setting up low bit rates can increase the delay.
When configured in Low Delay buffer mode the supported audio is limited to
MPEG-1 Layer II encode, Dolby Digital Encode, LPCM pass-through, Dolby Digital
pass-through and Dolby E pass-through.
6.8.1.3 Mega Low Delay Mode (CE-x, CE-xA, and CE-HEVC)
The module supports a Mega Low Delay buffer mode. Depending on video encoding
parameters, this can reduce the encode delay further (see table below), but will
have an impact on video quality. Parameters that primarily impact both delay and
quality are GOP structure and scene cut detection. Low bit rates can increase the
delay.
Note: When a VCM is configured for Mega Low Delay buffer mode the system
Clock Source (Mux SCR Source available under the Base Unit node in the
Device Configuration > Advanced Setup > Advanced Video Processor
Settings
widget) MUST be set to Video .
When configured in Mega Low Delay buffer mode the supported audio is limited to
MPEG-1 Layer II, LPCM pass-through, Dolby Digital pass-through and DolbyE pass-
through.
6.8.1.4 Compatibility Mode (CE-a J2K)
In compatibility mode the end-to-end delay introduced by the JPEG2000 encoding
and decoding the maximum delay remains below 160 ms, as set forth in the ITU-
T.802 or ISO/IEC 15444-3 specification.
Audio encoding is not supported in JPEG 2000. Only LPCM Pass-through or Dolby
E audio pass-through operation is supported.
6.8.1.5 Ultra Low Delay Mode (CE-a J2K)
The CE-a J2K module supports an Ultra Low Delay buffer mode. Depending on the
video encoding parameters, this can reduce the encode delay to as low as 100 ms
(see table below).
Audio encoding is not supported in JPEG 2000. Only audio Only LPCM Pass-
through or Dolby E pass-through operation is supported.