从mp4里面导出图片的暂行办法。。。

clear
close all
clc

videoObj=VideoReader('x:\DCIM\2016.mp4');
%gifFileName='test01.gif';
vo=VideoReader('x:\DCIM\2016.mp4');
videoFrames=get(vo,'NumberOfFrames');
clear vo;
disp(['This video has ',num2str(videoFrames),' frames in total.']);
videoDuration=get(videoObj,'Duration');
disp(['Total duration : ',num2str(videoDuration),' seconds.']);

pickFrameTime=12.5;
disp(['Time of the choosed frame: ',num2str(pickFrameTime)]);
videoObj.CurrentTime=min(pickFrameTime,videoObj.Duration);
img=readFrame(videoObj);
figure,
image(img)
axis image

pickFrameTime=8.5;
disp(['Time of the choosed frame: ',num2str(pickFrameTime)]);
videoObj.CurrentTime=min(pickFrameTime,videoObj.Duration);
img=readFrame(videoObj);
figure,
image(img)
axis image
% imwrite(img,'test01.png','png')

% 
% scrsz = get(0,'ScreenSize');
% hb=figure(1);%'Position',[150 50 scrsz(3)-200 scrsz(4)-200],'color','white');
% 
% % Preallocate movie structure.
% nFrames=450+80;
% mov(1:nFrames) = struct('cdata', [],'colormap', []);
% 
% ki=200;
% k=ki-1;
% while k<=nFrames
%     k=k+1;
%     img=readFrame(videoObj);%(videoObj,k);%Frame
%     if k==ki || mod(k,5)==1
%         [ind,mapi]=rgb2ind(img,64);
%         imagesc(imrotate(ind,-90));
%         axis image
%         colormap(mapi)
%         box off
%         set(gca,'xtick',[],'ytick',[])
%         
%         ax = gca;
%         ax.Units = 'pixels';
%         pos = ax.Position;
%         ti = ax.TightInset;
%         rect = [123-ti(1), -ti(2), pos(3)+ti(1)+ti(3)-243, pos(4)+ti(2)+ti(4)];
%         
%         mov(k) = getframe(ax,rect);%getframe;%(hb);%,[165 80 scrsz(3)-590 scrsz(4)-330]);
%         [Inx,cmap]=rgb2ind(mov(k).cdata,256);
%     end
%     
%     if k==ki
%         imwrite(Inx,cmap,gifFileName,'gif','DelayTime',0.25,'LoopCount',Inf)
%     else
%         if mod(k,5)==1
%             imwrite(Inx,cmap,gifFileName,'gif','WriteMode','append','DelayTime',0.15)
%         end
%     end
%     %pause(0.1)
% end
% 
%