matlab - Save extracted video frames as images -

i wish take screen grab of video frame , save each frame image in folder on desktop. there frames want capture however, written in text document.

my question is, how read in frame numbers stored in text document , extract these frames png files?

thanks can provide. if need clarify anything, please ask.

frames = dlmread('frames.txt');  %getting no of frames numframes = mov.numberofframes;  %setting current status of number of frames written 0 numframeswritten = 0;  t = frames: numframes    currframe = read(mov, t);    %reading individual frames    opbasefilename = sprintf('%3.3d.png', t);    opfullfilename = fullfile(opfolder, opbasefilename);    imwrite(currframe, opfullfilename, 'png');   %saving 'png' file    progindication = sprintf('wrote frame %4d of %d.', t, numframes);    disp(progindication);    numframeswritten = numframeswritten + 1; end 

if understand question correctly:

... how read in frame numbers stored in text document , extract these frames png files?

and assuming 'frames' vector contains subset of indicies of frames want, need change loop

for t = frames