我在
android中自动执行一个视频应用程序.为了做到这一点,我需要将视频分辨率设置为最高.
我知道在常规相机中,我可以设置值
- /data/data/com.android.gallery3d/shared_prefs/com.android.gallery3d_preferences_0.xml
但是我设置的值只是为相机而不是视频.任何存储视频分辨率值的想法？
如果有任何ADb命令存储视频编码解析,那将会更好.
以下是我使用的adb命令,但是似乎不起作用：
- adb shell am start -a android.media.action.VIDEO_CAPTURE --ei android.intent.extras.CAMERA_FACING 1 --ei android.intent.extras.EXTRA_VIDEO_QUALITY 1 -n com.android.gallery3d/com.android.camera.CameraActivity
我最近也发现了
- /data/data/com.android.gallery3d/shared_prefs/com.android.gallery3d_preferences_0.xml
文件包含最高分辨率的值,键名为：
“pref_video_quality_key”,但不知何故,它只能设置相机的值,而不是前置摄像头的值
解决方法
你不必去寻找,而是问系统.
每个设备都有一种支持的分辨率.您可以根据您的要求选择最适合的尺寸：
该怎么办？
步骤1.
您必须检查支持的尺寸.你可以做到这一点
- Camera.Parameters p = myCamera.getParameters();
- List<Size> previewsizes = p.getSupportedPreviewSizes();
- List<Size> videosizes = p.getSupportedVideoSizes();
然后,你可以选择一个.如果你想自动化这个,你可以进一步,并按照
第2步
写一个功能来选择最佳可用尺寸,这将获得支持的尺寸和所需的尺寸.哟可以得到比例更接近所需的大小,如果没有一个是足够好的,你会得到一个高度关闭到所需的高度,或者你可以得到最大的东西,如：
- public static final int BEST_RATIO=0;
- public static final int IMPORTANT_HEIGHT=2;
- public static final int IMPORTANT_WIDTH=1;
- public static final int BIGGEST=3;
- private Size getOptimalPreviewSize(List<Size> sizes,int w,int h,int mode) {
- final double ASPECT_TOLERANCE = 0.2;
- double targetRatio = (double) w / h;
- if (sizes == null)
- return null;
- Size optimalSize = null;
- double minDiff = Double.MAX_VALUE;
- int targetHeight = h;
- if (mode==BEST_RATIO)
- { for (Size size : sizes) {
- Log.d("Camera","Checking size " + size.width + "w " + size.height
- + "h");
- double ratio = (double) size.width / size.height;
- if (Math.abs(ratio - targetRatio) > ASPECT_TOLERANCE)
- continue;
- if (Math.abs(size.height - targetHeight) < minDiff) {
- optimalSize = size;
- minDiff = Math.abs(size.height - targetHeight);
- }
- }
- }
- if (mode= IMPORTANT_HEIGHT) { //you can do other for width
- minDiff = Double.MAX_VALUE;
- for (Size size : sizes) {
- if (Math.abs(size.height - targetHeight) < minDiff) {
- optimalSize = size;
- minDiff = Math.abs(size.height - targetHeight);
- }
- }
- }
- if (mode=IMPORTANT_WIDTH) { //you can do other for width
- minDiff = Double.MAX_VALUE;
- for (Size size : sizes) {
- if (Math.abs(size.Width - targetWidth) < minDiff) {
- optimalSize = size;
- minDiff = Math.abs(size.Width - targetWidth);
- }
- }
- }
- else {
- minDiff = 0;
- for (Size size : sizes) {
- if ( size.height * size.width > minDiff ) {
- optimalSize = size;
- minDiff = size.height * size.width ;
- }
- }
- }
- return optimalSize;
- }
最后一步,设置参数
步骤3
- private int desiredwidth=640,desiredheight=360;
- Size optimalPreviewSize = getOptimalPreviewSize(previewsizes,desiredwidth,desiredheight,BIGGEST);
- Size optimalVideoSize = getOptimalPreviewSize(videosizes,BIGGEST);
- p.setPreviewSize(optimalPreviewSSize.width,optimalPreviewSSize.height);
- CamcorderProfile profile = CamcorderProfile.get(cameraid,CamcorderProfile.QUALITY_LOW);
- profile.videoFrameHeight= optimalVideoSize.height;
- profile.videoFrameWidth=optimalVideoSize.with;
- mCamera.unlock();
- mMediaRecorder.setCamera(mCamera);
- mMediaRecorder = new MediaRecorder();
- mMediaRecorder.setVideoSize(optimalVideoSize.width,optimalVideoSize.height);
- myCamera.setParameters(p);
