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volumes2movie: replaced depreciated movie2avi with writeVideo #108

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Merged
tiborauer merged 1 commit into from
May 15, 2017
Merged

volumes2movie: replaced depreciated movie2avi with writeVideo #108

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39 changes: 34 additions & 5 deletions extrafunctions/volumes2movie.m
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Original file line number Diff line number Diff line change
@@ -1,27 +1,44 @@
function volumes2movie(V,outfile,fps)
% Converts a set of spm volumes (V struct) to a movie, saved as outfile and
% played back at fps.
% Converts a set of spm volumes (V struct) to a movie, saved as
% outfile and played back at fps.
%
% volumes2movie(V,outfile,fps)
%
% CHANGE HISTORY
%
% 5/2017 [MSJ] replaced movie2avi with writeVideo, general cleanup
%

xyz = spm_read_vols(V);

% Take 3 axial sections

steps = round(size(xyz,3)/4);
secs = [steps steps*2 steps*3];

% Flip around to appropriate orientation

for s = 1:3
axials{s} = permute(squeeze(xyz(:,:,secs(s),:)),[2 1 3]);
axials{s} = axials{s}(end:-1:1,:,:);
end

% And concatenate

axials = [axials{1} axials{2} axials{3}];

% And get rid of ridiculously big variable

clear xyz

% set video in standard display format to avoid weird distortions in most
% video players
% set video in standard display format to avoid weird distortions
% in most video players

axsize = size(axials);
goodsizes = [240 320; 480 640; 600 800; 768 1024];
ind = find(axsize(2)<goodsizes(:,2),1,'first');
targsize = goodsizes(ind,:);

if axsize(1)<targsize(1)
% add 0s at bottom
axials((axsize(1)+1):targsize(1),:,:) = 0;
Expand All @@ -31,15 +48,27 @@ function volumes2movie(V,outfile,fps)
end

% Rescale and make uint8

intmin = min(axials(:));
axials = axials - intmin;
intmax = max(axials(:));
axials = (axials/intmax);
axials = gray2ind(axials,255);

% Make movie frames

for f = 1:size(axials,3)
mframes(f,:) = im2frame(cat(3,axials(:,:,f),axials(:,:,f),axials(:,:,f)));
end

% Write out avi
movie2avi(mframes,outfile,'FPS',fps,'COMPRESSION','none');

% movie2avi(mframes,outfile,'FPS',fps,'COMPRESSION','none');
%
% movie2avi is no longer available. Use writeVideo instead:

v = VideoWriter(outfile, 'Uncompressed AVI');
v.FrameRate = fps;
open(v)
writeVideo(v, mframes);
close(v);