SMPTE  Film  Leader (synchronizing section)
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The SMPTE film leader script is an animated SVG image that simulates an old-style film leader.
It resizes if the aspect ratio is close to 1, and rotates if the aspect is vertical.
Sound buffering (such as by a graphic equalizer) may delay the beep.
The exact appearance depends on the (sans-serif) font in use.
In the mid-1960s, the Society of Motion Picture and Television Engineers (SMPTE) replaced the Academy Leader with a new style, called the SMPTE Universal Leader, designed for both television and theatrical projection applications (though it did not gain widespread acceptance theatrically). It featured a continuous countdown from 8 to 2 (measured in seconds, rather than feet), with the numbers in the center of a target with two white circles and a rotating “clock arm” animation. At the beginning, before the countdown, it features “16 SOUND START” and then “35 SOUND START” in a circle target. Then “PICTURE START” appears and the countdown begins. During the four count, the letters “C C F F” would appear around the countdown, signifying the use of those frames as “control frames.” At 2, a quick beep would be heard, sometimes known as the “2-pop.”
American Standard Specifications for Leaders and Cue Marks for 35mm and 16mm Sound Motion-Picture Release Prints
January 1965 Journal of the SMPTE Volume 74
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The synchronizing section shall be made up as follows:
Frame 1—The 16mm sound start indication shall be printed in white letters on a medium-density background.
Frames 2-6—Five frames of medium density.
Frame 7—The 35mm sound start indication shall be printed in white letters on a medium-density background.
Frames 8-16—Nine frames of medium density.
Frame 17—The 16mm sound indication shall be printed similar to Frame 1, except that the word “Start” is eliminated.
Frames 18-22—Five frames of medium density.
Frame 23—The 35mm sound indication shall be printed similar to Frame 7, except that the word “Start” is eliminated.
Frames 24-26—Three frames of medium density.
Frame 27—The words “Picture Start” shall be printed in black on a low-density background, the letters in the word “Picture” to be not less than 1/8 inch high and in “Start” not less than 1/4 inch high.
Frame 28—The start of the visual count-down, in seconds, commences with the figure “8” in black within a circle of low density on an overall low-density background with a 15-degree wedge of medium density on the right of top center, as projected. In each succeeding frame, the wedge increases in 15-degree steps, moving clockwise when projected.
Frame 33—The 16mm sound indication shall be printed replacing the numeral in this frame which otherwise retains the wedge.
Frame 39—The 35mm sound indication shall be printed replacing the numeral in this frame which otherwise retains the wedge.
Frame 50—All background, except for a 15-degree wedge at the top left center, is of medium density.
Frame 51—The numeral changes to “7” in black on a low-density background. On each side of the “7,” there shall be in letters 1/8 inch high, white on a low-density background, “M” and “70” vertically to indicate 70mm magnetic sound start.
Frame 52—The wedge again appears.
Frame 55—The white “M35” appears in the same format as the “M70” appears in Frame 51.
Frames 56-140—The sequence of numerals marking the seconds of film running time at 24 fps (frames per second) continues to Frame 140.
Frames 141-146—The moving wedge and numeral appear on Frames 141-146 but with the addition of the Gothic letters “C” and “F” on the left- and right-hand side of the circle, respectively, to indicate the position in the leader where one to six frames may be removed and a similar number of control frames spliced in.
Frames 147-170—The sequence of numerals and moving wedge marking the seconds of film running time continues through to Frame 170.
Frame 171—The numeral “2” in black on a low-density background appears ending the visual count-down.
Frames 172-210—Thirty-nine frames of diffuse density 1.0 to 1.2 maximum.
Frame 211—A single transparent dot shall be located as specified . . . . [The motor cue shall consist of an opaque circular dot with a transparent outline or a transparent circular dot with an opaque outline, printed from a 35mm negative which has had four consecutive frames punched with a die 0.094 inch in diameter.]
Frames 212-218—Seven frames of diffuse density 1.0 to 1.2 maximum.
SMPTE Universal Leader Countdown Film Leader Black and White [YouTube]
window aspect ratio:
(specifications assume 4/3, or 1.333; the Academy ratio is 1.375)
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