Sometimes the embedded (chromeless) YouTube player will fall silent on video playback for an apparently unexplained reason, with no immediate way to fix. I think it has to do with YouTube/flash caching muted sound settings from youtube.com or other non-chromeless player and somewhere along the way these are carried over to your chromeless video.
Just include these two calls in the javascript player prior to calling playVideo():
player.unMute();
player.setVolume(10);
thus guaranteeing sound playback regardless of previous state. Similar solution for Actionscript. Further API details at http://code.google.com/apis/youtube/js_api_reference.html
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