I create a video player based on flash. A video can be recorded with a different sound level - making some videos with the current volume setting very loud, some very silent. I was searching an API in Flash that allows me to set the volume on the used players dynamically. I was thinking that I found it in SoundMixer.computeSpectrum() and wanted to use it in combination with the SoundTransform volume property. But realized there are security issues with youtube, throwing an SecurityError 2122 asking for an crossdomain.xml which they seem not to provide.