While a YouTube video is still a live stream (or upcoming), the static
formats bestaudio requests may not be available, so yt-dlp fails with
'Requested format is not available'. Once the stream ends, YouTube
converts it to a regular VOD that downloads normally.
Before downloading, probe the video's live_status via yt-dlp. If it is
still live, reschedule the job in 10-minute increments (live_wait_count)
without counting against the normal retry budget. After 24 consecutive
waits (~4h) the job falls back to a regular retry attempt with the
exponential backoff, so a video that never converts still fails
permanently instead of retrying forever. Live waits are reset on
success or any ordinary retry.