Returns the unique integer value associated with an enumeration value, either according
to the AAF specification and/or the current AAF meta dictionary.
A video frame repeat effect, describing a clip that has a single essence frame as their
original source, shall be specified using a video repeat effect.
An alpha key effect in
which the alpha channel essence is separate from the video foreground and background essence shall be
specified using the separate-alpha key effect.
A video speed control effect, describing alterations to the playback speed of a clip
including forwards and backwards directions, shall be specified using a video speed control
effect.