Why it helps
You can now make a watchable video without a camera, a studio, or on-screen talent. AI handles the footage, the presenter, and the voiceover — you handle the script and the taste.
The workflow
- Write a tight script first. Aim for 30 to 90 seconds; every sentence is a shot.
- Decide the format. For a talking-head explainer, use Synthesia to turn your script into a video with a realistic AI presenter and voiceover in minutes.
- Want a specific person on screen — you or a spokesperson? HeyGen creates a talking avatar from a short sample clip.
- For cinematic B-roll and abstract scenes, generate clips in Runway; use Pika for fast, stylized shots and quick iterations.
- Assemble the pieces on a timeline, add captions, and export in your platform's aspect ratio (vertical for social, wide for YouTube).
Tips
- Keep each generated clip short; long AI clips drift and warp.
- Match the voiceover pace to the visuals — pauses read as professional.
- Burn in captions; most social video is watched on mute.
Bottom line
Synthesia and HeyGen carry the talking-head footage, while Runway and Pika supply the B-roll. Start with a strong script — the tools polish it, they don't rescue it.
