Randomly play single item from array?

Question

Super rookie here to Flash.
Is there some basic AS3 code to have, when the swf loads, a single video play from a collection of videos in an array? And can said code also apply to sound without video?
I just found out the tutorial I was using to randomize doesn't work with audio - as it just plays everything at once - you might 'see' one video - but you hear all them.
So from what I am reading, I need to us an array (that seems simple enough), but I don't want to play all the clips - I want it to randomly select and play one. Not sure exactly how I set up the video playback area (so the video plays where I want, at the size I want).
Also, I have other pages that are just audio - does audio need some sort of player or something for this?
ty

Answer 1

The length part of that code is the length property, which is like any other property for any object in the sense that you use the word as shown "length" (not its value like you tried) and it will hold the value of that property.
To keep the size of your file down, do not import the files into your fla, just load the selected one from where they are dynamically when the file is running.  The video will stream from its external location and your swf file will be happier for it. To get the FLVPlayback to play the video you need to assign it to the source property. 
var my_videos:Array=new Array ("cat1.flv","cat2.flv"); // actual filenames
var randomIndex = Math.floor(Math.random()*my_videos.length);
yourFLVPlaybackName.source = my_videos[randomIndex];
You should look up the FLVPlayback component in the help documents and familiarize yourself with all of it is properties, methods, and events.  In fact, you should learn to do this for any object you want to use in your designs.  Every class of object that you will use in a design has those three elements, properties, methods, and events, that not only define the object but are also your keys to making use of them.  So anytime you wonder how an object works, the first thing you oughta do is look it up in the help documents to see what properties, methods, and events support it.  Hopefully repetition of the words properties, methods, and events in this paragraph will help drive home the point that the help documents are an excellent resource to find information you need to make things work (properties, methods, events... and sometmes CONSTANTS)