Frame Split Generator

frame_sprite_generator.js

    var video = (new Array(100).join(',').split(',').map(function(v,i){return i})),
        sprite = function(start, length, split) {
            split = split != null ? split : 5;
            start = start != null ? start : 0;
            length = length != null ? start + length : undefined;
            var r = [],
                frames = video.slice(start, length);
            for (var i = 0; i < frames.length; i++)
                frames[i] % split === 0 && r.push(frames[i]);
            return r;
        };

        sprite(); // [5, 10]
        sprite(5); // [5, 10]
        sprite(5, 5); // [5, 10]
        sprite(5, 5, 5); // [5, 10]