Change the format of a capture datasorce

Im trying to change the format(really the resolution) to display the video from my webcam in a small panel(160x120).
RGBFormat format2 = new RGBFormat(new Dimension(160,120),76032,Format.byteArray,30,24,3,2,1,3,528,1,0); //this is an example of format supported
for ( int i = 0; i < formatControls.length; i++ ) {
if ( formatControls[i] == null )
continue;
formats = formatControls.getSupportedFormats();
System.err.println("Trying format " + format);
if (matches(format, formats)) { // this is a static method made by me that probes the matching of all array
format = formatControls[i].setFormat(format);
System.err.println("Matching format = " + format);
Well, this never works, the format displayed is the defalut RGB format(320x160).
What am i doing bad? Do i need a processor for doing this? My problem is that i want to encode the datasource later to a h263 format to transmit it and also display it in the screen but in a small window.
Help please!

its already solutionated!
If there is anybody interested....
The key is to run the setFormat(Format f) method with a Format f exactly obtained from the getSupportedFormats of the FormatControl.

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