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I think I know what you're talking about, but it's not InDesign. You're probably playing the MP3 in Acrobat or Reader, and those PDF readers don't make the MP3 file totally invisible.
I've done quite a bit of experimenting and this is the best I can come with: Give the MP3 file no poster image in InDesign, then export as Interactive PDF. After you create the PDF file, you need to select the invisible sound file with the Select Object tool in Acrobat Pro as shown below:
Double-click the sound file to view its properties. Set the file to play in a floating window. Then edit the dimensions to be 1 pixel by 1 pixel:
When the sound file is played it appears as a tiny black dot on the gray background outside the PDF page in Acrobat or Reader.
Hi Steve, thanks for the suggestion. I do use acrobat, and do know how to get rid of that playback bar post-indesign, one of the ways being what you suggested. The problem I have is that there are about 500 audio files in this ebook, and because there will be future drafts, I really want to do all processing in indesign, with no postprocessing.
Today I found one way to do this: place the mp3, resize it so it's smaller than the button; then make a button and cover the sound file box with it; what I then did was chose a poster for my button (play icon and stop icon - two appearances), and made 2 actions for the button, mouse release for play, and mouse over for stop. How this turns out in the pdf is as follows: when I mouse over the button the first time, it plays the file (even though 'release' is play); but this is fine, actually I kind of like it like that. The file then starts playing, with the button obscuring the playback control; then to stop the mp3 at any time just requires a mouseover; replaying the file then requires mouse release, as it only plays on mouseover the first time. Odd but it works.
Basically a variation on what you suggested, except I resize the mp3 box in indesign and keep it on the page (which is required for buttons to use the file anyway), just hiding it. Thanks again!
That's a good tip. All interactivity (buttons, etc.) appear at a layer on top of page items in Acrobat/Reader. So you can't hide sounds behind page items; they're always in front. So putting them behind other interactivity objects is a wonderful idea. I'll try playing with that.
Just one update to that solution: When I scrolled the pdf with the hand tool, the pesky toolbar reappeared; it also appears on page turn or moving a page around. So what I did was went back to indesign and resized the mp3 box to 1%; at this size, when you move around in the pdf, it doesn't pop out from behind the button. This also means however that one doesn't have to hide the mp3 behind the button; just resize the mp3 box in indesign to 1%, put it anywhere on the page, and use buttons to access it.
You're right. I just noticed that too.
When I reduced it to the smallest size possible, it's not visible when you move the page.
I'm going to write up this technique this morning on InDesignSecrets.com and credit you for this technique. This comes up every so often on this forum when people are trying to place sound files into interactive PDFs.
Ok Steve, glad it might be of help. I appreciate your time.
Sorry for bumping but I'm having a lot of hassle with mps and indesign 5. Slightly different issue...
Despite leaving the boxes unticked once I export as an exteractive pdf the mp3 *always* stops on page turn... there seems to be very little I can do... it should work I take it?