Matlab - 将两个视频合并为一个分屏视频

Question

我有 2 个视频想要在分屏中并排播放。它们的持续时间和尺寸相同。我发现几年前开发的代码可以完成这项工作。问题是，它充满了错误，可能是因为我使用的是较新的 Matlab 版本(2014a)。错误从 (%name of the new avi file) 开始。

任何人都可以尝试修复它吗:

% select two files:
[filename1,pathname1] = uigetfile('.avi','pick first AVI file');
[filename2,pathname2] = uigetfile('.avi','pick second AVI file');
file1 = fullfile(pathname1,filename1);
file2 = fullfile(pathname2,filename2);  
pdMovie1 = aviread(file1);
pdMovie2 = aviread(file2);
fileinfo1 = aviinfo(file1);
fileinfo2 = aviinfo(file2);

% check if AVI files have the same length and height:
if fileinfo1.NumFrames~=fileinfo2.NumFrames || ...
    fileinfo1.Height~=fileinfo2.Height
errordlg('files are not compatible!')
else
% inspired by Herbert Ramoser in Message-ID:
% <<a href="https://stackoverflow.com/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="a0c1d2d490c39084cc99c6c9d08491e0e9e48d9194989799988ecec5d7d38ec4c6cec3c9d38ec4c5" rel="noreferrer noopener nofollow">[email protected]</a>>
for i=1:size(pdMovie1,2)
  output(i).cdata = [pdMovie1(i).cdata, pdMovie2(i).cdata];
  output(i).colormap = pdMovie1(i).colormap;
end;

% name of the new avi file:
[pathstr,name,ext,versn] = fileparts(filename1);
newmoviename = [pathname1,name,'_combined', ...
                num2str(fileinfo1.FramesPerSecond;),ext];

% create the avi file:
movie2avi(output, newmoviename, ...
          'fps', fileinfo1.FramesPerSecond;, ...
          'compression', 'none');
close
end

Answer 1

如果只是为了并排播放视频，这个更简单的代码就可以工作，

close all
clc
clear

vid1 = vision.VideoFileReader('video1.avi');
vid2 = vision.VideoFileReader('video2.avi');
vidP = vision.VideoPlayer;

while ~isDone(vid1)
   frame1 = step(vid1);
   frame2 = step(vid2);

   frame = horzcat(frame1, frame2);

   step(vidP,frame);
end

release(vid1);
release(vid2);
release(vidP);

更新: 我假设两个输入视频具有相同的长度和帧尺寸。

好的，现在如果您想从前 2 个视频中录制一个新视频，并且与之前的帧速率相同，最好使用以下代码，

close all
clc
clear

vid1 = VideoReader('video1.avi');
vid2 = VideoReader('video2.avi');

videoPlayer = vision.VideoPlayer;

% new video
outputVideo = VideoWriter('newvideo.avi');
outputVideo.FrameRate = vid1.FrameRate;
open(outputVideo);

while hasFrame(vid1) && hasFrame(vid2)
    img1 = readFrame(vid1);
    img2 = readFrame(vid2);

    imgt = horzcat(img1, img2);

    % play video
    step(videoPlayer, imgt);

    % record new video
    writeVideo(outputVideo, imgt);
end

release(videoPlayer);
close(outputVideo);