#!/bin/bash
# Restreams the Makov webcam (YouTube live "Krmítko") into a local HLS
# playlist that never goes stale for the viewer — Jellyfin always points at
# this fixed local path, not at YouTube's own signed/expiring URL.
#
# When ffmpeg dies (the YouTube URL expired, network hiccup, stream briefly
# ended, ...) this script simply exits; systemd (Restart=always) starts it
# again, which resolves a *fresh* URL via yt-dlp. Nothing needs to be done
# by hand.
set -euo pipefail

YOUTUBE_URL="https://www.youtube.com/watch?v=F0fsV1GGZ3M"
OUT_DIR="/var/lib/jellyfin-iptv/hls"
OUT_FILE="${OUT_DIR}/makov.m3u8"

mkdir -p "$OUT_DIR"

# This live stream only serves separate video-only/audio-only HLS renditions
# (no combined progressive format), so we resolve both and let ffmpeg mux
# them. "bestvideo+bestaudio" makes yt-dlp -g print exactly two URLs, video
# then audio; fall back to "best" in case a progressive format reappears.
mapfile -t STREAM_URLS < <(yt-dlp -g -f 'bestvideo+bestaudio/best' "$YOUTUBE_URL")
VIDEO_URL="${STREAM_URLS[0]:-}"
AUDIO_URL="${STREAM_URLS[1]:-}"

if [ -z "$VIDEO_URL" ]; then
    echo "yt-dlp nevrátilo žádnou URL (stream offline, nebo se YouTube brání) — končím, systemd to za chvíli zkusí znovu." >&2
    exit 1
fi

if [ -z "$AUDIO_URL" ]; then
    # Progressive fallback matched: single URL carries both video and audio.
    exec ffmpeg -nostdin -loglevel warning \
        -re -i "$VIDEO_URL" \
        -c copy \
        -f hls -hls_time 4 -hls_list_size 6 \
        -hls_flags delete_segments+omit_endlist \
        -hls_segment_filename "${OUT_DIR}/makov_%03d.ts" \
        "$OUT_FILE"
fi

exec ffmpeg -nostdin -loglevel warning \
    -re -i "$VIDEO_URL" -re -i "$AUDIO_URL" \
    -map 0:v -map 1:a \
    -c copy \
    -f hls -hls_time 4 -hls_list_size 6 \
    -hls_flags delete_segments+omit_endlist \
    -hls_segment_filename "${OUT_DIR}/makov_%03d.ts" \
    "$OUT_FILE"