Function periodic_idr_due 

pub fn periodic_idr_due(
    settings: &RustCaptureSettings,
    frame_counter: u16,
) -> bool

Whether a scheduled keyframe is due this tick.

The default (keyframe_interval_s <= 0) is an infinite GOP with no scheduled IDRs. A positive interval buys a fixed ~N-second recovery cadence for consumers that cannot request one on demand.

Arguments

• settings - Capture settings; reads keyframe_interval_s and target_fps.
• frame_counter - Current frame number (wrapping u16).

Returns

true if a periodic IDR should be forced on this frame.