Function probeNearbyKeyframes

probeNearbyKeyframes(
    mediaUrl: string,
    nearSeconds: number,
    durationSeconds: number,
    window?: KeyframeProbeWindowOptions,
): Promise<number[]>
Probes nearby video keyframes using packet-level ffprobe (container index, no decode).
Parameters
- mediaUrl: string
  Direct media URL readable by ffprobe.
- nearSeconds: number
  Approximate timestamp to search around.
- durationSeconds: number
  Total media duration in seconds.
- window: KeyframeProbeWindowOptions = {}
  Symmetric centered window or asymmetric look-back/forward span.
Returns Promise<number[]>
Keyframe timestamps found in the window, or an empty array when probing fails.
- Defined in lib/youtube-import/probe-keyframes.ts:532