New narrowed end group (inclusive / protocol defined) must be > start group.
Updated direction flag.
OptionalparametersOptional additional VersionSpecificParameters; existing parameters persist if omitted.
Updated subscriber priority (same constraints as initial subscribe). 0 is highest, 255 is lowest.
Request id for this update operation (bigint or number).
New narrowed Location start.
The original SUBSCRIBE request id (bigint) being updated.
Narrowing update constraints applied to an existing SUBSCRIBE via MOQtailClient.subscribeUpdate.
Rules: start can only move forward (increase) and endGroup can only move backward (decrease) narrowing the window.
Example: Narrowing a live window