There are no devices installed for the specified ADAPTORNAME

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目标： matlab_r2014a利用mac电脑自带摄像头录制avi视频
步骤： 1.在matlab窗口命令行输入info＝imaqhwinfo，查看已安装的图像采集设备。
2. info =

InstalledAdaptors: {'dcam'}    MATLABVersion: '8.3 (R2014a)'      ToolboxName: 'Image Acquisition Toolbox'   ToolboxVersion: '4.7 (R2014a)'

3. 创建一个视频输入对象：
obj=videoinput(‘dcam’,1,’YUY2_320x240’);
问题：There are no devices installed for the specified ADAPTORNAME. See IMAQHWINFO.
原因：没有在matlab中安装对象摄像头的支持包
解决方法：1. 输入supportPackageInstaller，安装OS Generic Video Interface，GigE Vision Hardware(如果只用电脑自带摄像头可不安装)
2. 再次info＝imaqhwinfo
3. info =

InstalledAdaptors: {'dcam'  'gige'  'macvideo'}    MATLABVersion: '8.3 (R2014a)'      ToolboxName: 'Image Acquisition Toolbox'   ToolboxVersion: '4.7 (R2014a)'

4. 终于，adaptorname为 ‘macvideo’, 输入imaqhwinfo(‘macvideo’) 查看相关信息：

ans =

   AdaptorDllName: '/Users/Bill_Wong/Documents/MATLAB/SupportPackages/R2014a/genericvideo/adaptor/mac...'AdaptorDllVersion: '4.7 (R2014a)'      AdaptorName: 'macvideo'        DeviceIDs: {[1]}       DeviceInfo: [1x1 struct]

得到deviceID为1, 视频的格式查看命令：ans.DeviceInfo

ans =

         DefaultFormat: 'YCbCr422_1280x720'   DeviceFileSupported: 0            DeviceName: 'FaceTime \u9ad8\u6e05\u6444\u50cf\u5934'              DeviceID: 1 VideoInputConstructor: 'videoinput('macvideo', 1)'VideoDeviceConstructor: 'imaq.VideoDevice('macvideo', 1)'      SupportedFormats: {'YCbCr422_1280x720'}

即为：’YCbCr422_1280x720’
5. 最终正确的命令应该为：
obj=videoinput(‘macvideo’,1,’YCbCr422_1280x720’)

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