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Video frame delays, Preview output, Video frame delays preview output – Grass Valley Imagestore 750 v.3.0.1 User Manual

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Imagestore 750

User Manual

Video Frame Delays

It is very important for video and audio (including Dolby metadata) to maintain a constant and
unchanging delay through the Imagestore 750 system to avoid lip-sync problems. To help
achieve this, the Imagestore 750 provides the following video frame delays:

You can configure these delays in the Imagestore 750 Configurator using

System Settings > Video > Video Frame Delays.

The ‘post A/B-mix’ delays are primarily used to compensate for the DVE and any in-stream
branding insertion. The ‘output’ delays are primarily used to compensate for the audio delay
through Dolby decode and encode modules.

Other aspects that affect the configuration of system delays are discussed in the following
sections:

DVE delays

DVE (for Program and Preview)

, page 41

In-stream branding

In-Stream Branding Insertion

, page 18

Dolby delays and decode / encode modules—

Dolby Processing Times

on page 117;

Dolby

Delays

on page 146

Metadata delays—

Metadata Delays

on page 148

Up-mix modules—

Up-Mix Processing Times

on page 136

Audio delay blocks—

Audio Delay Blocks

on page 148

Note: There is no video frame delay associated with the monitor output. Such delay is seen at
the monitor output only if it is selected to monitor either of the program, preview or clean-feed
outputs.

Preview Output

The preview output selection defines the SDI output to be viewed at PVW OUT. It can be set to
one of the following values at the front panel menu using

Operate

>

Preview

Output

:

Name

Bus

Position

Compensates For Delays From . . . Range

Program post-AB mix frame
delay

PGM

Post A/B-mix

DVE, in-stream branding insertion,
audio modules

0–8

Preview post-AB mix frame
delay

PVW

Post A/B-mix

DVE, in-stream branding insertion,
audio modules

0–8

Program output frame delay

PGM

Output

Audio modules

0–16

Preview output frame delay

PVW

Output

Audio modules

0–16

Clean feed output frame delay CLN

Output

Audio modules

0–16

Table 4-10: Imagestore750 Video frame delays

Selection

Description

Preview o/p

Selects default preview output

Program o/p

Selects a copy of PGM OUT as the preview output

PGM AB Mix

Selects output from PGM A/B Mixer as the preview output

Table 4-11: Preview output options