也谈matlab中读取视频的一个重要函数mmreader

心已赠人 2022-04-17 00:05 422阅读 0赞

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在matlab中输入help mmreader来查阅一下该函数，有如下信息：

MMREADER Create a multimedia reader object.  
   
    OBJ = MMREADER(FILENAME) constructs a multimedia reader object, OBJ, that  
    can read in video data from a multimedia file.  FILENAME is a string  
    specifying the name of a multimedia file.  There are no restrictions  
    on file extensions.  By default, MATLAB looks for the file FILENAME on  
    the MATLAB path.  
   
    If the object cannot be constructed for any reason (for example, if the  
    file cannot be opened or does not exist, or if the file format is not  
    recognized or supported), then MATLAB throws an error.  
   
    OBJ = MMREADER(FILENAME, 'P1', V1, 'P2', V2, ...)  
    constructs a multimedia reader object, assigning values V1, V2, etc. to the  
    specified properties P1, P2, etc.  
   
    If an invalid property name or property value is specified, MATLAB throws  
    an error and the object is not created.  Note that the property value pairs  
    can be in any format supported by the SET function, e.g. parameter-value  
    string pairs, structures, or parameter-value cell array pairs.

下面给出两个简单的应用：

clearclccd('C:\Documents and Settings\Administrator\桌面\matlab');% .avi必须是无损压缩的. matlab读取发现，视频尺寸为176*144fileName = 'ntia_wfall-qcif_original.avi'; % mm不表示美眉，而表示multimedia. obj是一个对象obj = mmreader(fileName); % 读取所有的帧数据vidFrames = read(obj); % 帧的总数numFrames = obj.numberOfFrames;% 读取数据% mov(k)是一个结构体，mov(k).cdata实际上就是一个有RGB的帧 for k = 1 : numFrames     mov(k).cdata = vidFrames(:,:,:,k);     mov(k).colormap = [];end % 在matlab中播放视频movie(mov);

clearclccd('C:\Documents and Settings\Administrator\桌面\matlab');% 有损压缩的.mpg视频. matlab读取后发现，视频大小为352*288fileName = '功夫熊猫_盖世五侠的秘密.mpg'; % mm不表示美眉，而表示multimedia. obj是一个对象obj = mmreader(fileName); begin = 1001;% 读取[begin begin + 99]中的100帧数据vidFrames = read(obj, [begin begin + 99]);% 读取数据% mov(k)是一个结构体，mov(k).cdata实际上就是一个有RGB的帧 for k = 1 : 100     mov(k).cdata = vidFrames(:,:,:,k);     mov(k).colormap = [];end % 在matlab中播放视频movie(mov);

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