JMF Control
Ø FrameGrabbingControl : This  control is used to grab a still video
frame from the video stream.
Ø FrameRateControl : You can specify the frame rate using this
control.
Ø MonitorControl : Some capture devices or encoders may allow you
to monitor ( view/ listen ) to the capture or encoding progress
through this control.
Ø QualityControl : Some JMF objects such as encoders allow you to
control the quality of the media they deliver using this control.
Ø SilenceSuppressionControl : is a Control for specifying the
parameters for silence suppression.
Ø StreamWriterControl : This interface is implemented by a
Multiplexer or DataSink to enable controlling the number of bytes
generated as output.
Method of using the control :
QualityControl    qc =  (QualityControl)  processor.getControl
( "javax.media.control.QualityControl” );
float quality = qc.setQuality( 0.3f ) ;