Transitions

A transition changes a parameter over time: opacity, scale, position, rotation, volume, or pan.

Anatomy

• Property — parameter to change;
• From — optional start value; current value when omitted;
• To — destination;
• Duration — change duration in seconds;
• Pre-wait — delay after the trigger;
• Curve — interpolation shape;
• Trigger — lifecycle, external, manual, or timecode event.

Curves

Curve	Character
Linear	Constant mathematical rate
Ease In	Slow start
Ease Out	Slow finish
S Curve / Ease In Out	Soft start and finish
Step Start	Jump at the beginning
Step End / Hold Then Step	Hold, then jump at the end

Volume uses perceptual mapping and pan uses equal-power mapping, so a linear raw value does not imply a linear perceived audio change.

Crossfade two videos

1. Put Video A below Video B.
2. On Video B, fade its opacity 0 → 1 with On Play.
3. Add another Video B action targeting Video A and fade opacity to 0.
4. Fade Video A's volume when it contains audio.
5. Stop Video A after both fades complete.

Older projects may contain tracks[], fadeInSec, fadeOutSec, or other legacy transition fields. The engine migrates supported data into visible actions. Save migrated projects under a new name and rehearse them.