External MP3 files causing long delays (using MediaPlayBack component)

I've got 5 MP3 files that I am calling (on click) to be
played. They're large - about 15MB each. The Flash movie is
intended to be distributed on a CD. However, when I launch the
movie (Flash Pro with Slides) it takes a long time (30-200 seconds)
before the first screen will show. Sometimes Flash displays the
"actionscript is taking a long time..." message. When I remove the
slides that play the MP3 there is no slowness. Also, when the MP3s
cannot be found the movie has no delays.
I converted the slides back to a timeline-based movie. This
eliminated the up-front delay, but now the delay appears when I
click on the button to play the MP3.
Any ideas?

I noticed that streaming is not working from CD... Instead
all the file is loaded first, and that's why you've got
delays...

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Using Flashvars to load external mp3 files

I am trying to find a very good step by step tutorial on using "Flashvars" to load external mp3 files, I have been searching on google and the many I have found fall short in some way or another. From what I have been able to gather, I have tried using the code in red (commented out), which works, and modify it to use "Flashvars". The code that works, the mp3 file is hard coded, but my goal is to use "Flashvars" which I am attempting to do in the code following the code in red. I am also including the html code. Any help will be greatly appreciated.
Thanks,
David
var soundReq:URLRequest = new URLRequest("mardi_gras2.mp3");
var sound:Sound = new Sound();
sound.load(soundReq);
sound.addEventListener(Event.COMPLETE, onComplete);
function onComplete(event:Event):void
    sound.play();
var soundReq:URLRequest = new URLRequest(root.loaderInfo.parameters.audio);
var sound:Sound = new Sound();
sound.load(soundReq);
sound.addEventListener(Event.COMPLETE, onComplete);
function onComplete(event:Event):void
    sound.play();
HTML CODE
<object classid="clsid:d27cdb6e-ae6d-11cf-96b8-444553540000" codebase="http://download.macromedia.com/pub/shockwave/cabs/flash/swflash.cab#version=9,0,0,0" width="550" height="400" id="mySoundvars" align="middle">
    <param name="allowScriptAccess" value="sameDomain" />
    <param name="allowFullScreen" value="false" />
    <param name="movie" value="mySoundvars.swf" />
   <param name="FlashVars" value="audio=mardi_gras2.mp3" />
    <param name="quality" value="high" /><param name="bgcolor" value="#ffffff" />    <embed src="mySoundvars.swf" quality="high" bgcolor="#ffffff" width="550" height="400" name="mySoundvars" align="middle" allowScriptAccess="sameDomain" allowFullScreen="false" type="application/x-shockwave-flash" pluginspage="http://www.adobe.com/go/getflashplayer" FlashVars="audio=mardi_gras2.mp3" />

Ok waterlovinguy,
I went back to my original code, and I got things to work... I think my whole issue was with the HTML CODE. So I decided to use the "SWFObject generator". I had never used it before, frankly I had never heard of it until I started my searches on "Flashvars".
Thank you very much for all your assistance, PEACE,
David
Final Codes below
var my_var:String = new String();
my_var = root.loaderInfo.parameters.myflashvar;
myText.text = my_var;
var soundReq:URLRequest = new URLRequest(root.loaderInfo.parameters.audio);
var sound:Sound = new Sound();
var soundControl:SoundChannel = new SoundChannel;
sound.load(soundReq);
play_btn.addEventListener(MouseEvent.CLICK, playSound);
stop_btn.addEventListener(MouseEvent.CLICK, stopSound);
function playSound(event:MouseEvent):void
    SoundMixer.stopAll();
    soundControl = sound.play();
function stopSound(event:MouseEvent):void
    soundControl.stop();
HTML Code
                <!>>
                <!<![endif]>
                    http://www.adobe.com/go/getflashplayer
                    </a>
                <!>>
                </object>
                <!<![endif]>
            </object

Trouble with loading external mp3 files

I apologize for the length of the post. I hope this is clear
of what I am trying to explain.
My problem deals with getting "undefined" when I press a
button to load an external mp3 files. The following is what my XML
childNode looks like:
<option phonetic="Soundless, or A" name="aleph"
cursive="alephCursive.swf" block="alephBlock.swf"
audio="char1.mp3"/>
Every attribute loads the way I've programmed them, except
for the last one "audio".
The following is what my actionscript looks like loading in
these attributes:
Everything is happening inside the onLoad event for my XML
file.
var xmlContent = this.firstChild.firstChild;
audioContent = new Array();
for (var i = 0;
i<this.firstChild.firstChild.childNodes.length; i++) {
nextEntry = xmlContent.childNodes
audioContent = [nextEntry.attributes.phonetic,
nextEntry.attributes.name, nextEntry.attributes.cursive,
extEntry.attributes.block, nextEntry.attributes.audio];
The code above simply adds each attribute to the audioContent
array. Each element traces out correctly.
The following code is how I am using these attributes:
for (var i = 0; i<audioLength; i++) {
audioContainer.attachMovie("container4", "audioItem"+i, i);
// Create a shortcut reference to the present movie clip
thisClip = audioContainer["audioItem"+i];
thisClip.myTxt1.htmlText = audioContent[0];
thisClip.myTxt2.htmlText = audioContent
[1];
thisClip.cursive_mc =
loadThis(assetPath+audioContent[2], thisClip.cursive_mc);
thisClip.block_mc = loadThis(assetPath+audioContent
[3], thisClip.block_mc);
thisClip.speaker_mc.attachMovie("speaker", "speaker_mc",
this.getNextHighestDepth());
thisClip.speaker_mc.speaker_mc.onRollOver = function() {
this.nextFrame();
thisClip.speaker_mc.speaker_mc.onRollOut = function() {
this.prevFrame();
thisClip.speaker_mc.speaker_mc.onRelease = function() {
mySnd.loadSound(audioPath+audioContent[4],true);
Loading the text works inside the htmlText. Using a function
loadThis to load external swf files works corerctly and even
attaching a linked movieclip from my library called "speaker" works
correctly.
The problem comes from pressing the speaker movieclip that
the output traces "undefined" instead of the external mp3 file.
I appreciate any help. Thanks.

As Ned said the problem might be with the file structure on the server. Other problems may be with spelling. You computer may not be case sensitive to the names of the .swf files that you are loading, but your server might. So, on your computer when you are testing, second.swf is the same as Second.swf, or even second.SWF. But, on the server each of these variations is seen as a different file. Another problem is that when you are loading files from the same computer in testing, those files are close and so they load very quickly from your computer. When the files have to travel from the server, there will likely be a measurable period of time before the file is ready to be shown. This is particularly problematic with video that is embedded into an .swf. The whole file will need to be downloaded and uncompressed before it is available to play. If you stream the video as an external file, you can shorten the wait considerably.

External MP3 files not working

Hi,
I have attached code straight out of the help file for using
External MP3 files. It works perfect when I use their HelpExample
sound MP3 file. However when I simply change the code to point to a
working MP3 sound file in my LocalHost folder it executes but I
only get a Blip sound.
If I just double click on the sound file it sounds ok. and I
have been successful in using these MP3 files embedded in Flash 8.0
fla file
Do the external MP3 files have to be on some special server?
I am using this code with Flash 8.0
Thanks,
hugh

The most likely reason for this failure is that since your SWF is now embedded into another SWF (the Captivate project) the paths to the AS files need to be altered in Flash to allow for this.
You need to investigate how this would be done in AS code if your Flash SWF was a symbol inside another Flash SWF.

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To reduce the size, I placed all the mp3 fiels in the same folder as the swf file and removed all reference to them from the project.
I then added this code to frame #1
import flash.events.Event;
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import flash.net.URLRequest;
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I haven't look into the help documents (you can), but I see you mixing up AS2 and AS3 code, along with treating a URLRequest (AS3) as if it is a Sound object....
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External MP3 files causing long delays (using MediaPlayBack component)

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