camera.setquality() not working for h264 encoding

Hi,

Im using H264 encoder for encoding my live video to broadcast to ios devices. But there seems a big loss in quality while using the H264 encoder. The code im using for encoding is

var h264Settings:H264VideoStreamSettings = new H264VideoStreamSettings();

    h264Settings.setProfileLevel(H264Profile.MAIN, H264Level.LEVEL_3_1);

    _ns.videoStreamSettings = h264Settings;

    camera.setQuality( 0, 100 );

    camera.setMode( 320, 240, 30, true );

    camera.setKeyFrameInterval( 15 );

    camera.setLoopback(true);

    _ns.publish("videoname?adbe-live-event=liveevent","record");

Is there any possiblity to improve my video quality or any other way of encoding the video?.

Im using flex sdk 4.6 and flash player 11.8.

Thanks in advance