Preferences >

# Timeline Preferences

## Editing

Default Timecode field
  Displays the default start timecode value for new items overwritten or inserted into a timeline sequence. Editable.

Merge Tracks Mode box
  Select how a timeline will be flattened when merging tracks.

  Select: | To merge tracks by:
  --- | ---
  Simple Track Merge | Hard committing all soft transitions. Cut points between elements are preserved; clip handles are not.
  Complex Track Merge | Hard committing soft transitions but creating separate elements with clip handles for each.
  Committed Track Merge | Preserving editable soft transitions and clip handles.

Auto Timewarp button
  Enable to specify the behaviour of four-point replace and overwrite edits, when they involve a different number of frames between the in and out points on the source and sequence clips.

Framerate Converter button
  Enable to format the source clip to the correct destination framerate by applying a video timewarp to the source clip.

Snap Includes Marks button
  Enable to snap to timeline marks.

Snap With Positioner button
  Enable to snap segments to the positioner.

Display Phantom Marks button
  Enable to turn on phantom marks on the timeline and source clip. Phantom marks indicate the result of a 4-point edit regardless of whether you have marks set.

## Containers

Uncontain options box
  Select whether new tracks and versions are added or overwritten when a container segment is uncontained.

Contain Timewarped Edits button
  Enable to preserve the edits in a fit-to-fill four-point edit. The incoming clip is contained and a timewarp is applied to the container instead of the clip.

## Segment Display

Handles box
  Select an option for displaying heads and tails on segments in the timeline.

## Navigation

Frame Positioner box
  Select whether to snap the timeline positioner frame-to-frame, or on a sub-frame basis (one-tenth of a frame).

Autoscroll field
  Displays the speed at which the timeline scrolls. Editable.

Scroll During Playback button
  Enable to scroll the timeline during playback, keeping the frame positioner visible.

Scroll Past First Frame button
  Enable to allow the positioner to move before frame one.

## Transitions

Dissolve Duration field
  Drag left or right, or enter a value to set the default duration for dissolves.

Transition Alignment box
  Sets the default alignment for dissolves, wipes, axis, and custom transitions.

Curve Type box
  Select Bezier or linear as the default curve type for dissolves.

Default Wipe button
  Opens the file browser, where you select the default wipe type to be used when creating wipe transitions and timeline effects.

Default Wipe field
  Displays a SMPTE wipe number to be used as the default wipe for wipe transitions and timeline effects. Editable.

## Rendering

Timeline Effects Render Mode box
  Select the render mode when a Timeline FX is added to a clip.

Timewarp Render Mode box
  Select the default rendering mode for timewarps created in the timeline.

Transitions Render Mode box
  Select a default rendering mode for transitions created in the timeline.

Cache Preview Effects button
  Enable to cache frames rendered in the timeline.

Auto Rendering button
  Enable to background render automatically when you enter the Axis, Wipe, Colour Corrector, or Sparks Editor.

Timeline Effects Rendering box
  Select whether to render an entire track first, then the next track (Track Based Render), or to render all tracks frame-by-frame (Frame Based Render).