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POCompress movies of flat plots of few points and lines in Matlab (why are they so heavy?)
 

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  1. POCompress movies of flat plots of few points and lines in Matlab (why are they so heavy?)
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    <p>Consider a sequence of points:</p> <pre><code>N = 8 * 360; t = (0:9:N) + N / 4; x = sqrt(t) .* cos(t * pi / 180); y = sqrt(t) .* sin(t * pi / 180); </code></pre> <p>Then visualize the path, get the frames and make a movie:</p> <pre><code>f = figure('Position', [300 75 900 600]); hold on h_plot1 = plot(x(2:end), y(2:end), 'ob', 'MarkerEdgeColor', 'b', 'MarkerFaceColor', 'b', 'MarkerSize', 5); h_plot2 = plot(x(1), y(1), 'o-r', 'MarkerEdgeColor', 'b', 'MarkerFaceColor', 'b', 'MarkerSize', 5, 'LineWidth', 3); x_min = min(x); x_max = max(x); y_min = min(y); y_max = max(y); x_w = x_max - x_min; y_w = y_max - y_min; axis([x_min - x_w / 10 x_max + x_w / 10 y_min - y_w / 10 y_max + y_w / 10]) axis equal, axis off set(f, 'Color', [1 1 .25]) set(gca, 'Color', [1 1 .25]) set(gca,'nextplot','replacechildren'); vid = VideoWriter('myveryheavymovie.avi'); vid.Quality = 100; vid.FrameRate = 15; open(vid); for hh = 1:length(x)-1 hold on set(h_plot1, 'XData', x((hh + 1):end), 'YData', y((hh + 1):end)) set(h_plot2, 'XData', x(1:(hh + 1)), 'YData', y(1:(hh + 1))) tmp = plot(x(hh:hh+1), y(hh:hh+1), 'or', 'MarkerSize', 8, 'MarkerFaceColor', 'r'); writeVideo(vid, getframe(f)); delete(tmp) writeVideo(vid, getframe(f)); end close(vid); </code></pre> <p>The movie is <code>111,840 KB</code>, unreasonably heavy - is there a way to compress the movie? The images are just a handful of points and lines: can the movie be compressed to - say - less than <code>1,000 KB</code>?</p> <p><strong>EDIT</strong> following answers from A. Donda, chappjc and horchler</p> <p>Apparently I cannot change profile and for the moment I haven't tried third party software. I have tried generating a gif animation with imwrite:</p> <pre><code>% Consider a sequence of points: N = 8 * 360; t = (0:9:N) + N / 4; x = sqrt(t) .* cos(t * pi / 180); y = sqrt(t) .* sin(t * pi / 180); x_min = min(x); x_max = max(x); y_min = min(y); y_max = max(y); x_w = x_max - x_min; y_w = y_max - y_min; % Create figure: f = figure('Position', [300 75 900 600]); set(f, 'Color', [1 1 .25]) h_plot1 = plot(x(2:end), y(2:end), 'ob', 'MarkerEdgeColor', 'b', 'MarkerFaceColor', 'b', 'MarkerSize', 3); hold on h_plot2 = plot(x(1), y(1), 'o-r', 'MarkerEdgeColor', 'b', 'MarkerFaceColor', 'b', 'MarkerSize', 3, 'LineWidth', 3); axis([x_min - x_w / 10 x_max + x_w / 10 y_min - y_w / 10 y_max + y_w / 10]) axis equal, axis off set(gca, 'nextplot','replacechildren', 'Visible','off'); % preallocate mov fo gif animation nFrames = length(x)-1; frame = getframe(gca); [frame, map] = rgb2ind(frame.cdata, 256, 'nodither'); map = [map; 1 0 0]; mov = repmat(frame, [1 1 1 2*nFrames]); % Visualize it, get the frames and save gif animation for hh = 1:nFrames set(h_plot1, 'XData', x((hh + 1):end), 'YData', y((hh + 1):end)) set(h_plot2, 'XData', x(1:(hh + 1)), 'YData', y(1:(hh + 1))) hold on tmp = plot(x(hh:hh+1), y(hh:hh+1), 'or', 'MarkerSize', 8, 'MarkerEdgeColor', 'r', 'MarkerFaceColor', 'r'); frame = getframe(gca); mov(:, :, 1, 2*hh-1) = rgb2ind(frame.cdata, map, 'nodither'); delete(tmp) frame = getframe(gca); mov(:, :, 1, 2*hh) = rgb2ind(frame.cdata, map, 'nodither'); end close(gcf) imwrite(mov, map, 'mynotsoheavygif.gif', 'DelayTime', 0, 'LoopCount', inf) </code></pre> <p>The gif file is <code>4,420 KB</code> - which is not good and not bad but better than the avi file.</p>
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    1. COIs there an error when you create the `VideoWriter` with the `'MPEG-4'` profile?
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    2. CO@chappjc I only have two profile options: `Motion JPEG AVI` and `Uncompressed AVI`. Running on Matlab R2012b, on Windows.
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