Image Directory Movie Stimulus

Description

A movie stimulus that gets its frames from a directory of image files.

Note: To preserve each image’s aspect ratio on screen, x_size and y_size must be equal. When drawn, the larger dimension spans the full specified size, while the smaller dimension is scaled to maintain the aspect ratio.

Signature

stimulus/image_directory_movie

Required Parameters

directory_path

Filesystem path to the directory containing the image files.

All non-hidden files in this directory must be images. The frames are ordered according to the lexical sort order of the file names.

frames_per_second

Rate at which to display the movie’s frames

Optional Parameters

x_size

Example:5.0

Horizontal size (degrees).

If omitted, the value of y_size is used. It is an error to omit both x_size and y_size (unless fullscreen is YES).

y_size

Example:5.0

Vertical size (degrees).

If omitted, the value of x_size is used. It is an error to omit both x_size and y_size (unless fullscreen is YES).

x_position

Default:0.0

Horizontal center position (degrees)

y_position

Default:0.0

Vertical center position (degrees)

rotation

Default:0.0

Rotation (degrees)

alpha_multiplier

Default:1.0

Controls the transparency of the stimulus. 1.0 is fully opaque, while 0.0 is fully tranparent.

fullscreen

Default:NO

If YES, the stimulus is sized to fill the display. In this mode, x_size, y_size, x_position, y_position, and rotation are ignored.

ended

Variable that will be set to true after the last frame has displayed. (Specifically, it will be set to true at the time that the next frame after the last would have been drawn, if there were one.)

loop

Default:NO

If YES, the presentation will repeat indefinitely (or until Stop Dynamic Stimulus is invoked)

repeats

Default:0

Number of times to repeat the presentation. Note that the presentation will always run at least once, even if this value is less than one.

If loop is YES, this parameter is ignored.

deferred

Options:
no
yes
explicit
Default:no

Controls when the stimulus is loaded. If no, the stimulus is loaded at experiment load time. If yes, the stimulus is loaded the first time it is queued. If explicit, the stimulus must be loaded explictly with Load Stimulus.

autoplay

Default:NO

If YES, the stimulus will start playing automatically (as if by an implicit Play Dynamic Stimulus action) after it has been queued and Update Stimulus Display has been invoked. It will also stop playing automatically (as if by an implicit Stop Dynamic Stimulus action) after it has been dequeued and Update Stimulus Display is invoked.