Make screen shot by using php

Hello there,

I would like to ask you, how can i make screen shoot(of movie clip for example) by As3 and send this data to php and there make jpg or somethink like this. I do not want JPGEncoder a thinks like this, because it's slow, when i want make screen 2000x2000 px. I need solution which will be quick, so just send data to php and there find solution how this data convert to jpg.

Thanks for all ideas!