Use composition markers and layer markers to store comments
and other metadata and mark important times in a composition or
layer. Composition markers appear in the time ruler for the composition,
whereas layer markers each appear on the duration bar of a specific
layer. Both kinds of markers can hold the same information.
Markers can refer to a single point in time or to a duration.
Composition markers in After Effects correspond to sequence markers
in Adobe Premiere Pro. Layer markers in After Effects correspond
to clip markers in Adobe Premiere Pro.
When you render a composition that contains markers, the markers
can be converted to web links, chapter links (chapter points), or
cue points, depending on the output format and values that you set
in the marker dialog box. Markers can also be exported as XMP metadata.
(See XMP
metadata.)
The default comment for a composition marker is a number, whereas
the default comment for a layer marker is nothing.
A marker that contains link or cue point data has a small dot
in its icon.
A. composition marker with duration of 1 second B. composition
marker with cue-point data C. layer
marker with duration of 2 seconds D. layer
marker with cue-point data
註解：
Markers make it easier to align layers or the
current-time indicator with specific points in time: When you drag
a keyframe, the current-time indicator, or a layer duration bar
in the Timeline panel, hold down Shift to snap these items to markers.
You can add markers during a preview or audio-only preview, which allows you to place markers at significant points in the audio track of a layer.
Dragging a marker in point changes the marker's time and dragging a marker out point changes the marker's duration. You cannot simultaneously change the marker time and duration.
To view or edit data for a marker, double-click the marker, right-click (Windows) or Control-click (macOS) the marker, and choose Settings.
To move a marker to a different time, drag the marker or double-click it and enter a time in the dialog box.
To set the duration of a composition or layer marker, drag the marker's out point in the Timeline panel. Marker icons are split in half to indicate the marker in point and out point.
To set a marker's duration by dragging, hold the Option (macOS) or Alt (Windows) key, select the marker icon, and drag to the right.
To change the duration of a marker, select and drag the marker out point icon; you don't need to hold Option or Alt.
To automatically create layer markers for a layer based on the temporal metadata in the layer’s source file, select the Create Layer Markers From Footage XMP Metadata preference in the Media & Disk Cache preferences category. This preference is on by default.
To synchronize layer markers on a precomposition layer to corresponding composition markers for the source composition, right-click (Windows) or Control-click (macOS) a layer marker and choose Update Markers From Source. This command also removes any markers that you have added to the layer.
註解：
If the layer uses a file (rather than a composition) as its source, this command restores the layer markers to those representing the temporal XMP metadata for the source file.
If you add one composition to another, the original composition
becomes nested as a layer in the containing composition. All of
the composition markers from the nested composition become layer
markers in the timeline of the containing composition. These markers
are not linked to the original composition markers. Changes that
you make to the composition markers in the original composition do
not affect layer markers in the nested composition. For example,
if you remove one of the original composition markers, the corresponding
layer marker for the nested composition remains in place.
Scripts and expressions can read and use data stored in markers.
Because XMP metadata for source footage items can be converted to
layer markers, expressions and scripts can work with XMP metadata.
Create composition markers
Composition markers appear as small triangles in the time ruler in the Timeline panel. You can have any number of composition markers in a composition.
If you remove a numbered composition marker, the other markers remain numbered as they were. If you change the comment from the default number, that number may be reused by a composition marker created later.
There can be at most one composition marker beginning at each time. If you add or move a composition marker to start at the same point in time as another composition marker, the added or moved marker replaces the other marker.
註解：
For alternative
keyboard shortcuts, see Markers
(keyboard shortcuts).
To add a blank composition marker at the current time, ensure no layer is selected, and choose Layer > Add Marker or press * (multiply) on the numeric keypad.
註解：
Pressing * during a preview or audio-only preview adds a marker at the current time without interrupting the preview.
To add a composition marker at the current time and open the marker dialog box, make sure that no layer is selected, and press Alt+* (Windows) or Option+* (macOS) on the numeric keypad.
To add a composition marker from the bin, drag the marker from the Comp Marker Bin button.
Dragging a composition marker from the bin.
Dragging a composition marker from the bin.
To add a numbered composition marker at the current time, press Shift + a number key (0–9) on the main keyboard.
註解：
If the number you press is already used by another composition marker, After Effects does not create a new marker. Instead, it moves the existing marker with that number to the new position.
To remove a composition marker, drag the marker to the Comp Marker Bin button or Ctrl-click (Windows) or Command-click (macOS) the marker.
To lock all composition markers on a composition, right-click (Windows) or Control-click (macOS) a marker on the composition and choose Lock Markers.
Apply layer markers
Layer markers appear as small triangles on
the duration bar of a layer. You can have any number of layer markers
on a layer.
Layer markers are retained when you render and
export a movie to a QuickTime container.
註解：
For
alternative keyboard shortcuts, see Markers
(keyboard shortcuts).
To add a layer marker to selected layers at the current time, choose Layer > Add Marker or press * (multiply) on the numeric keypad.
註解：
Pressing * during a preview or audio-only preview adds a marker at the current time without interrupting the preview.
To add a layer marker at the current time and open the marker dialog box, press Alt+* (Windows) or Option+* (macOS) on the numeric keypad.
To remove a layer marker, Ctrl-click (Windows) or Command-click (macOS) the marker.
To remove all layer markers from selected layers, right-click (Windows) or Control-click (macOS) a marker and choose Delete All Markers.
To lock all layer markers on a layer, right-click (Windows) or Control-click (macOS) a marker on the layer and choose Lock Markers.
To replace all layer markers with markers containing temporal metadata from the source file for the layer, right-click (Windows) or Control-click (macOS) a layer marker and choose Update Markers From Source.
註解：
In After Effects CS6 or later, adding a layer marker no longer deselects other objects (masks, and effects, for example).
Assign color labels to markers
You can assign color labels to Composition and Layer markers. By default, markers have no color. To change the color label of a marker, follow these steps:
Select and open the Marker settings dialog.
Change the New Label property. To define color labels, select Preferences > Labels.
Scripts and utilities for working
with markers
Paul Tuersley provides a script on the AE Enhancers forum for splitting layers
at layer markers.
Lloyd Alvarez provides scripts on the After Effects Scripts website
that do the following:
Magnum, the Edit Detector automatically detects edits in a footage layer and places a layer marker at each edit (or splits the layer into a separate layer for each edit).
Zorro, the Layer Tagger allows you to tag layers and then select, shy, and solo layers according to their tags. The tags are appended to comments in the Comments column in the Timeline panel and can also be added as layer markers.
Layer Marker Batch Editor edits marker attributes on all selected layers, including Flash cue point attributes.
More like this
Scripts
Preview video and audio
MarkerKey attributes (expression reference)
About XMP metadata
XMP metadata in After Effects
Sharing markers with After Effects and Encore
Chapter points