matlab重新写入视频并播放

最新推荐文章于 2023-04-04 21:34:22 发布

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本文深入探讨了视频处理的基本概念和技术，包括如何使用特定函数读取、获取、设置视频信息以及播放视频的方法。详细解释了`mmreader`、`get`、`set`和`movie`等关键函数的作用，并通过实例展示了如何实现这些操作。此外，文章还介绍了视频读取的不同方式，以及如何构造结构体、预分配存储空间和播放视频的具体步骤。

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    %%说明：此程序主要是从指定的视频中读取视频，并且将视频重新写入并且播放
    %%用的函数说明：
        %mmreader读取视频，get获取视频信息，set设置图片的位置和大小，moive播放视频
        %strcut构造结构体，read读取视频信息
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

xyloObj = mmreader('traffic1.avi'); %读取视频
get(xyloObj) %获取视频信息

%%%%%%%%%%%%%%%%read函数的用法
    %video = read(obj, 1);         % first frame only
    %video = read(obj, [1 10]);    % first 10 frames
    %video = read(obj, Inf);       % last frame only
    %video = read(obj, [50 Inf]); % frame 50 through end of file
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

lastFrame = read(xyloObj, inf);                  %读取最后一帧
nFrames = xyloObj.NumberOfFrames;                %求取帧的数目
vidHeight = xyloObj.Height;                      %帧的高度240
vidWidth = xyloObj.Width ;                      %帧的宽带320

%Preallocate movie structure.                     %省略号表示换行，经过验证放到一行去对程序结果你没有影响
                                                 %构造结构体类型
mov(1:nFrames) = ...
    struct('cdata', zeros(vidHeight, vidWidth, 3, 'uint8'),...
           'colormap', []);
%%%%%%%%经过验证，将上述省略号删除后，对程序的结果没有影响
%mov(1:nFrames) =struct('cdata', zeros(vidHeight, vidWidth, 3, 'uint8'),'colormap',[]);

% Read one frame at a time.
for k = 1 : nFrames
mov(k).cdata = read(xyloObj, k); %将xyloObj中的数据存储到mov中
end

% Size a figure based on the video's width and height.
hf = figure;
set(hf, 'position', [150 150 vidWidth vidHeight]); %position是figure窗口的位置，是[left, bottom, width, height]，针对于screen左下角来做的

% Play back the movie once at the video's frame rate.
movie(hf, mov, 1, xyloObj.FrameRate);