# Slate video (offline)

Place `offline.mp4` here — H.264 + AAC, 1280x720, 30fps, 48kHz stereo.
Must match phone encoder settings for seamless `alwaysAvailable` merge.

Generate a test slate with ffmpeg:

```bash
ffmpeg -f lavfi -i color=c=0x1a1a1a:s=1280x720:r=30 -f lavfi -i sine=frequency=440:sample_rate=48000 \
  -t 10 -c:v libx264 -pix_fmt yuv420p -g 30 -c:a aac -b:a 128k offline.mp4
```