6. Change a named scene after assembly

The edit is now assembled, but its structure is still useful. In this chapter you will name the finished edit and select its evening placement. You will then apply an effect without writing a fixed time range.

Continue editing learning.clipasm from Add a flash between scenes.

1. Save the assembled edit

Replace the final five statements with a named clip:

clip {
    $morning
    $meadow
    flash_cut(200ms)
    $evening
} as edit

$edit

The body produces the morning-to-meadow transition and the evening clip. clip concatenates those values into one Video. The bare $evening reference also gives that occurrence the placement name evening inside edit.

2. Validate the assembled edit

Validate:

clipasm validate learning.clipasm

The result remains one 108-frame Video.

3. Select the evening placement

Add during after $edit:

$edit
during($edit::evening) {
    zoom_in(2%)
}

$edit::evening is the exact range occupied by the named evening occurrence. Unlike 3s..4500ms, the selector continues to identify that scene if an earlier scene changes duration.

during consumes the complete edit. Its body starts with the selected evening slice on the body stack, so zoom_in can consume that slice normally. The during call then splices the body’s result into the original timeline.

4. Validate the revised edit

clipasm validate learning.clipasm

Validation still reports 108 frames.

5. Render the revised edit

clipasm render learning.clipasm

6. Check the timeline edit

Open generated/learning.mp4. The meadow retains its original movement. The evening now has a subtler zoom.

Names have uses beyond reuse. When named values reach a composition, they can become stable placement paths for later timeline edits.

Next, reuse a scene style across source files.

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