在Flash中添加快进、快退按钮，需使用ActionScript编写控制代码。例如：
actionscript
// 快进按钮
fastForward_btn.addEventListener(MouseEvent.CLICK, fastForward);
function fastForward(e:MouseEvent):void {
if (yourVideo.currentPlaybackRate + 1 <= maxPlaybackRate) {
yourVideo.currentPlaybackRate += 1;
}
}
// 快退按钮
rewind_btn.addEventListener(MouseEvent.CLICK, rewind);
function rewind(e:MouseEvent):void {
if (yourVideo.currentPlaybackRate - 1 >= minPlaybackRate) {
yourVideo.currentPlaybackRate -= 1;
}
}

确保将 `yourVideo` 替换为实际的视频实例名，并设置合适的 `maxPlaybackRate` 和 `minPlaybackRate` 来限制播放速度范围。