Appendix A ’Technical Specifications’ — Common Specifications
538 Electra VS
-
Version 05.10
User Manual - Rev. A
IP TV Latency
The formula to obtain the latency is as follows:
Latency = <input latency> + <Coder delay> / <Output frame rate> +
<Decoder delay> + <Optional processing latency>
With:
Input latency:
SDI input: 0.64 second.
TS/IP input: 1.3 second.
Coder delay: this is the value configured in the encoders (see section
’H.264 AVC Encoder’
on page 311, section
’H.265 HEVC Encoder’
on
page 315, section
’MPEG-2 Encoder’
on page 309). The values are
identical for the three encoders:
Standard
: 55 frames.
Short
: 41 frames.
Ultra-short
: 26 frames.
Decoder delay: this is the value configured in the encoders (see
section
’H.264 AVC Encoder’
on page 311, section
’H.265 HEVC
Encoder’
on page 315, section
’MPEG-2 Encoder’
on page 309). The
value is fixed to 1 second for MPEG-2 encoding.
Output frame rate: it depends on the input frame rate, and on the
optional frame rate adaptation you may have added.
Optional processing latency: it depends on the video processing you
have configured. It is null if there is no preprocessing.
Examples (without any video processing):
SDI input, H264, 25 fps, delay set to
Standard
: 4.3 seconds.
SDI input, H264, 25 fps, delay set to
Short
: 3.3 seconds.
SDI input, H264, 25 fps, delay set to
Ultra-short
: 2.5 seconds.
SDI input, H264, 60 fps, delay set to
Standard
: 3.1 seconds.
TS/IP input, H264, 60 fps, delay set to
Standard
: 3.7 seconds.
In Statmux mode, the formula to obtain the latency is as follows:
Latency = <input latency> + 61 / <Output frame rate> + 1.2 second +
<Optional processing latency>
Audio transcoding (radio, or TV with pass-through video), TS/IP input /
TS/IP output:
Latency is approximately 2 seconds.
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