我需要以特定分辨率录制视频(尽可能少).

private void startRecording(Player player, net.rim.device.api.ui.Manager parentManager)

{

try

{

if (player == null)

{

player = javax.microedition.media.Manager.createPlayer("capture://video?encoding=video/3gpp");

player.addPlayerListener(this);

player.realize();

RecordControl recordControl = (RecordControl) player.getControl("RecordControl");

VideoControl videoControl = (VideoControl) player.getControl("VideoControl");

if (videoControl != null)

{

final Field videoField = (Field)videoControl.initDisplayMode( VideoControl.USE_GUI_PRIMITIVE, "net.rim.device.api.ui.Field" );

try

{

videoControl.setDisplaySize(1, 1);

}catch(Exception e)

{

System.out.println(e);

}

videoControl.setVisible(true);

UiApplication.getUiApplication().invokeLater(new Runnable() {

public void run()

{

if(parentManager != null)

{

if(videoField.getIndex() == -1)

{

parentManager.insert(videoField, 1);

}

}

}

});

}

}

// here i get null

CameraControl cameraControl = (CameraControl) player.getControl("CameraControl");

int[] resolutions = cameraControl.getSupportedVideoResolutions();

cameraControl.setVideoResolution(resolutions.length / 2 - 1);

recordControl.setRecordLocation("test.3gp");\

recordControl.startRecord();

player.start();

}catch(Exception e)

{

System.out.println(e);

}

}

但由于某种原因(CameraControl)player.getControl(“CameraControl”);返回null

如何指定录制视频的分辨率？

附：黑莓OS 5.0,Torch 9800

更新：

在我使用的情况下

capture://video?encoding=video/3gpp&mode=mms

要么

capture://video?encoding=video/3gpp&width=240&height=180&video_codec=MPEG-4&audio_codec=AMR

我在PlayerListener.playerUpdate(Player player,String event,Object eventData)方法中得到event = error和eventData = 2

eventData = 2的描述我发现here：

Invalid parameter: a parameter was specified with an invalid value.

有人能解释我为什么我的params不正确吗？