How to decrease the size of H263 video

I want to generate a captured video to H263 format.
Now I am sucessful to generate it to the format.But the size of the generated file seems a bit large.
I think I can solve this problem by the means changing the parameters' value that is passed to the H263Format constructor.
But I don't know how to adjust these values because I don't know much about H263's parameters
Can someone do me the favor to tell me how to adjust the parameters below to decrease the video's size.
Thx in advance
H263Format
public H263Format(java.awt.Dimension size,
                  int maxDataLength,
                  java.lang.Class dataType,
                  float frameRate,
                  int advancedPrediction,
                  int arithmeticCoding,
                  int errorCompensation,
                  int hrDB,
                  int pbFrames,
                  int unrestrictedVector)
    Constructs an H263Format object with the specified attributes.
    Parameters:
        size - A Dimension that specifies the frame size.
        maxDataLength - The maximum size of the compressed data array.
        dataType - The class type of the data.
        frameRate - The frame rate of the video.
        advancedPrediction - Specifies whether or not the H.263 advanced prediction capability (H.263 Annex F) is used.
        arithmeticCoding - Specifies whether or not the H.263 arithmetic coding capability (H.263 Annex E) is used.
        errorCompensation - Specifies whether or not the H.263 error compensation capability is used.
        hrDB - Specifies the H.263 Hypothetical Reference decoder buffer.
        pbFrames - Specifies whether or not the H.263 PB Frames capability (H.263 Annex G) is used.
        unrestrictedVector - Specifies whether or not the H.263 unrestricted motion vector capability (H.263 Annex D) is used.

Usually you would have the video in other format diferent from h263, so you have to encode it with a processor. You must configure a processor and set the format from the video track to h263. Dont use the larger constructor, use simply:
videotrackcontrol.setFormat(new VideoFormat(VideoFormat.H263));
Then realize and start the processor. Take care with the syncronize.
But you will need that the datasource of the processor has your preferred size before create it. And notice not all sizes are compatible with h263.

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How to decrease the size of H263 video

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