;Frame control : A one byte field that contains bits describing the data portion of the frame contents which indicates whether the frame contains data or control information.
22.
The APNG specification introduces three new chunks : The animation control chunk ( acTL ), the frame control chunk ( fcTL ) and the frame data chunk ( fdAT ).
23.
Internal cards and software from other manufacturers are available to control VTRs; the most common systems go through the serial port to provide single-frame control of a VTR as a capture device for LightWave animations.
24.
Other accessories and capabilities were modularly added in successive years, including Steadicam magazines ( 1996 ), an integrated video assist ( 1997 ), magazines and single frame control ( 1998 ), and 3-perf movement ( 2000 ).
25.
Sequence numbers apply to both frame control and frame data chunks, which together follow a common sequence, thus enabling the order and timing of frames to be recovered should an APNG-unaware PNG editor re-order them as allowed by PNG chunk ordering rules.
