Caption Bounce Animation

Controls the per-word scale-pop animation window for burn-in captions.

video-caption-bounce accepts either:

• A duration in milliseconds — each word scales up from a smaller size over the specified time window as it appears.
• true — enables the scale-pop with a default duration.
• false — disables the animation.

The bounce effect makes each word appear to “pop” into frame with a brief scale-up animation. This is most effective in word-pop style where words appear one at a time.

Combine with video-caption-build for a simultaneous fade-and-scale entry effect.