#!/bin/sh
# Slate MP4 per MediaMTX alwaysAvailable (pausa / attesa / perdita rete).
# H.264 1280x720 30fps + AAC 48kHz mono (allineato all'app Android).
set -e
ROOT="$(cd "$(dirname "$0")/../.." && pwd)"
OUT_DIR="$(cd "$(dirname "$0")/../slates" && pwd)"
BRAND_IMAGE="${BRAND_IMAGE:-$ROOT/brand/CopertinaCanale_6.png}"
OUT="$OUT_DIR/offline.mp4"

if [ ! -f "$BRAND_IMAGE" ]; then
  echo "Manca immagine brand: $BRAND_IMAGE" >&2
  exit 1
fi

mkdir -p "$OUT_DIR"
BRAND_DIR="$(cd "$(dirname "$BRAND_IMAGE")" && pwd)"
BRAND_FILE="$(basename "$BRAND_IMAGE")"

docker run --rm \
  -v "$OUT_DIR:/out" \
  -v "$BRAND_DIR:/brand:ro" \
  linuxserver/ffmpeg:latest \
  -loop 1 -framerate 30 -i "/brand/$BRAND_FILE" \
  -f lavfi -i anullsrc=r=48000:cl=mono \
  -filter:v "scale=1280:720:force_original_aspect_ratio=decrease,pad=1280:720:(ow-iw)/2:(oh-ih)/2:color=0x0a0a0e" \
  -map 0:v -map 1:a \
  -t 30 -c:v libx264 -pix_fmt yuv420p -profile:v baseline -level 3.1 \
  -x264-params "keyint=30:min-keyint=30:scenecut=0:bframes=0" \
  -g 30 -keyint_min 30 -force_key_frames "expr:gte(t,n_forced*1)" \
  -preset fast \
  -c:a aac -b:a 128k -ac 1 -shortest -y /out/offline.mp4

echo "Created $OUT from $BRAND_IMAGE"