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K2 Edge Protocol Manual – document version 1.0 – Page 15

4.9. Sub command preload

Function: prepares a template for playback.

field name

field type

value

cmd

mandatory

nre

subcmd

mandatory

preload

template

mandatory

Name of the template to be preloaded, as defined in Channel

Composer.

exid

mandatory

External ID. Free format. See above.

inst

mandatory

Unique template instance ID. Numeric. See above.

stm

optional

Start time for the preload command in hh:mm:ss:ff timecode format.

When not specified, the command starts as soon as possible.

spname0

...

spvalue0

...

optional Optional scene parameters. See above.

sg-select

optional

Embedded alternative to separate sg-select sub command, where

the value for this field must be set to what the

rootfolder

field

expects in the

sg-select

command. See section on sub command

sg-select

below for details.

sg-inst

optional

Scene graph instance ID needed alongside the sg-select field

described above.

ttl

optional

Time-to-live value in seconds for all needed assets (clips, etc) claimed

during this preload command. The asset resources will be freed after

the given time. Make sure

ttl

is long enough to cover the distance in

time between this preload- and the follow up play sub command.

Numeric, in seconds. Value 0 indicates no ttl. Value -1 indicates default

ttl value as defined in the nexos init params channel section.

role

optional

Role field. See above.

fb-sw

optional

Feedback switch. Set value to

true

to request feedback. See

dedicated chapter on feedback.

fb-lev

optional

Feedback detail level. Supported values are basic,

most

and full.

Default is basic.

The combination of the template and inst field values uniquely identifies the template instance. The follow

up play command must define the same template and inst values.

Example:

{cmd=nre; subcmd=preload; template=PlayMovie; inst=0; exid=1;

stm=14:13:00:00; spname0=clipname; spvalue0=a0000123.mpg;}

Newlines do not exist in K2 Edge API commands. Examples are wrapped for layout purposes only.

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