4. Transform one scene

The sequence is structurally complete. Now you will add movement to the meadow without changing the other scenes or the total duration.

Continue editing learning.clipasm from Name and reference a clip.

1. Add the effect where it belongs

Place zoom_in(4%) immediately after the meadow image:

clip {
    image("assets/morning.png", 1500ms, contain)
    image("assets/meadow.png", 1500ms, contain)
    zoom_in(4%)
    image("assets/evening.png", 1500ms, contain)
} as pictures

$pictures

zoom_in needs one Video. This call has no explicit Video input. It consumes the nearest Video on the stack, which is the meadow. The call leaves the transformed Video in its place:

[morning, meadow] -> zoom_in -> [morning, zoomed meadow]

The following image call creates the evening scene. The clip therefore still combines three scenes in the original order.

2. Validate the source

clipasm validate learning.clipasm

3. Render the video

clipasm render learning.clipasm

Validation still reports 108 frames because zoom_in preserves duration.

4. Check the result

Open generated/learning.mp4. Confirm that only the meadow moves.

Calls that omit Video or Audio inputs bind matching Video or Audio values from the stack. Their position is therefore part of the program’s meaning.

Next, add a flash between scenes.