Re: Questions on Sound (was synchronize voiceover with graphics)

[John Croteau]

Hi Changhsu, David, Stumpy and all,


John wrote:

> > >  When you lay down audio in Flash you will see  how long the a sound

> > >bite is on the timeline, so you can easily plan your graphics and where

> > >to begin or trigger the next sequence.

My statements above were make in response to Changhsu's question about

syncing a voiceover with graphics. In this case there is no sound

looping and as long as you don't need tight timing inside each segment,

then there is no problem using Flash. I would suggest using a

Wait-for-frame check for each segment to improve performance, help

eliminate stuttering of sound and allow good sync between sound and

graphics.


Music is more difficult if you need to keep it in sync with graphics or

animations. The proper use of Wait-for-Frames eliminates the speed of

the Web from the equation, but you are still left with processor speed

variations which will effect how good the timing will be. Looping sound

inside the Sound Edit console pretty much eliminates any sound to

timeline synching past the first loop since the second loop starts

immediately after the first loop ends regardless of where the animation

is at, it doesn't even necessarily line up with the start of a new

frame. To maintain sound sync to animation, you must set looping in the

Sound console to none and loop using the timeline. For good sound, when

using the timeline to loop, fade the sound and leave a little slack. A

small sound pause is normally preferable to a glitch. It is very

important to be sure that the sound and graphics have been downloaded

before they are needed. Looping music in the Sound Console should

normally be reserved for background music where there is no need to sync

sound.



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