Watermark Entrance Transition Duration

Overrides the entrance transition duration for an image watermark. When set, this takes precedence over mark-transition-dur for the entrance only, while the exit continues to use -dur or its own mark-transition-out-dur override.

mark-transition-in-dur accepts a float in seconds from 0 to 60. Use mark-transition-in-dur[N] for a specific watermark layer.

Requires a transition type to be set via mark-transition or mark-transition-in.