Generate them from the agent photo (free) — SadTalker on Google Colab's free GPU turns one photo into both clips in ~10 minutes: blinking idle face + moving lips. Step-by-step guide: docs/avatar-photoreal-free.md in the repo (start with python scripts/make_avatar_audio.py).
Or record them — 10–20 seconds each on a phone, same seat, same framing, same lighting. Idle: look at the lens, blink, breathe. Talking: read anything at a natural pace. Start and end in the same pose so the loop doesn't jump.
Or generate via a trial — one HeyGen/D-ID free credit renders a talking clip you loop forever.
Or use stock — Pexels and Pixabay have free talking-head footage.
Mute them and keep them small (a few MB). Drop the files in content/agent/ and reference them as /agent-assets/<file>.mp4, or paste any public URL.