I treated camera playback as “live with a start time.” Don’t.

Описание и применение

Веб‑приложение для мониторинга IP‑камер было доработано, чтобы воспроизведение записанного видео работало как VOD: корректный выбор сегментов, правильное отображение времени и безопасное управление доступом.

Задача

Treating recorded IP camera playback as a live stream with a start time caused incorrect GOP selection, misleading seek bars, and timezone mismatches, leading to poor user experience and security issues.

Результат

Playback now behaves like VOD: correct first frame, accurate seek, proper empty state handling, and secure RBAC enforcement, eliminating the previous live‑stream misbehaviors.

Рабочий процесс

• Select a time range using a site‑time picker
• Send authorized request to list available segments for the range
• If segments exist, initialize a playback player with the segment list
• On mode switch, destroy any existing player before creating a new one
• Handle empty ranges by showing a clear message
• Ensure RBAC controls hide playback for users without review permission
• Log channelId and timestamps for debugging
• Use separate live tiles for live‑device actions like PTZ or two‑way talk

Доказательства

If the list‑segments call returns [], I stop. I do not init the player “just in case.”

The bug that bit me: pause() on live and then seek(). Some stacks ignore seek on a live transport.