Using the Equipment
Notes: The modes shown below will not work correctly if the unit is frame
synchronized, it is recommended for low latency that frame sync is not
used.
The modes shown below will not work correctly if the unit has 3D license
enabled.
• RX Delay Mode – Configures the delay mode through the unit. All of these
delays are added to the PCR/PTS time and this means the presentation of the
picture is held by a defined amount of time compared to clock reference.
- Compatibility – This mode adds the largest delay before presentation
(390 ms). This is designed to guarantee compatibility between all encode
units in all modes.
- Standard – This is the default value for the IRD delay before presentation
(210 ms). This is designed to allow usage between all current encoders in all
modes of encoder delay operation, older encoders may provide buffer
models that are too aggressive to allow this mode to be used at all bit rates
and all audio encoding schemes
- Low – This is only available if the Low Delay license option is purchased.
This is the recommended setting for simple contribution links, this adds a
delay before presentation (66 ms). This should be used with contribution
systems only, it is recommended that lower bit rate audio encoded with
simpler coding formats is used e.g. pass-thru or MPEG.
- Mega Low – This is only available if the Low Delay license option is
purchased. In this mode there is no delay before presentation (0 ms). The
unit will present video and audio when the PTS associated with the video /
audio components is equal to the PCR. This will cause problems when the
encoder delay is very aggressive and the bit rates are high, also complex
audio coding formats will require longer delay to be decoded (i.e. AAC and
AC3).
• Note for 4:2:2 video formats – To achieve the lowest possible end to
end delay, this mode should be used in conjunction with the 422 VSync
Lock option.
• Note for 4:2:0 video formats – If a compatible 4:2:2 Decoder Option
card is fitted, it will be used for decoding in place of the Base Decoder
and the above note regarding 4:2:2 video formats will also apply to 4:2:0.
Otherwise the Base Decoder will be used and no further action is
required.
- User-defined – This instructs the RX8000 to use delay values defined by
the user entered in the Rx Delay 4:2:0 field or Rx Delay 4:2:2 field.
Note: Apart from User-defined, RX Delay Modes are not applicable to JPEG 2000
encoded streams. For JPEG 2000, the lowest possible delay is always
used.
• Rx Delay 4:2:0 – This allows the user to define the additional system delay to
be applied to the receiver the Base Decoder is being used. The Base Decoder
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