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piv_bfield_movies.m
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piv_bfield_movies.m
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function piv_bfield_movies(OPTIONS, dir_case)
%% make movie using FFMPEG
files = dir([dir_case filesep 'figures' filesep '*.png']);
fnames = sort_nat({files.name}, 'ascend'); % sort the file list with natural ordering
fnames = fnames(:); % reshape into a nicer list
for n = 1:numel(fnames)
% drop the __00000.png (9 characters)
names_prefix{n} = fnames{n}(1:end-9);
end
% find the number occurences of each filename, anything with only 1
% occurence cannot be made into movie
[uniqueStrings, ~, v] = unique(names_prefix(:));
% occurrence = accumarray(v,1); %// Or: occurrence = histc(v,unique(v));
k = 0;
for n = 1:numel(uniqueStrings)
if strcmp(uniqueStrings{n}(end-1:end), '__')
% the last two characters are "__" indications a image sequence
k = k + 1;
movie_names{k} = uniqueStrings{n};
end
end
iminfo = imfinfo([dir_case filesep 'figures' filesep fnames{1}]);
w = iminfo.Width;
h = iminfo.Height;
dir_here = pwd;
dir_there = [dir_case filesep 'figures'];
cd(dir_there);
for k = 1:numel(movie_names)
system(['ffmpeg -framerate ' num2str(OPTIONS.fps) ' -i ' movie_names{k} '%05d.png -s:v ' num2str(w) 'x' num2str(h) ' -c:v libx264 -profile:v high -crf 20 -pix_fmt yuv420p ' 'movie_' movie_names{k} '.mp4']);
end
cd(dir_here);
end % function