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VideoFramework.m
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VideoFramework.m
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classdef VideoFramework < handle
% Framework for creating videos.
%
% Gerhard Kurz
%
% Example usage:
% e = ExampleVideo
% e.preview
% e.createVideo
properties
totalFrames = 100;
framerate = 30; %number of frames per second
projectName = '';
mode = 'fw' %supported modes are fw, bw and fwbw
end
methods
function this = VideoFramework()
addpath(pwd);
end
function preview(this)
% Runs the video, but does not save anything
this.projectName = class(this);
this.init();
this.runVideo(false);
end
function createVideo(this)
% Runs the video, saves frames as PNG, and encodes them as video files
this.clean();
[~,~,~] = mkdir(this.projectName);
this.runVideo(true);
this.encode();
end
function encode(this)
% Encodes the PNG frames as a video.
if isempty(this.projectName)
this.projectName = class(this);
end
this.init();
cd(this.projectName)
try
% MATLAB encoder
this.encodeMatlab();
% ffmpeg
% -y
% Overwrite output files without asking.
% -f image2 -framerate %i -i %%06d.png
% read consecutively numbered images with 6 digits, use
% user-defined framerate
% -vf crop=in_w-1:in_h-1
% crop 1 pixel because PNGs have odd number of pixels
% -b 2000k
% bitrate (2000k = 2MBit/s)
% -qscale 1
% highest quality
% best version (h264)
system(sprintf('ffmpeg -y -f image2 -framerate %i -i %%06d.png -vcodec libx264 -vf crop=in_w-1:in_h-1 output.mp4', this.framerate));
% h264 for Powerpoint
% https://msdn.microsoft.com/de-de/library/windows/desktop/dd797815%28v=vs.85%29.aspx
% maximum resolution is 1920 x 1088 pixels, thus we use 720p
% only supports yuv420p pixel format
system(sprintf('ffmpeg -y -f image2 -framerate %i -i %%06d.png -vcodec libx264 -pix_fmt yuv420p -vf crop="in_w-1:in_h-1, scale=-1:720" output-ppt.mp4', this.framerate));
% wmv for Powerpoint, different resolutions, needs higher
% bitrate than h264
system(sprintf('ffmpeg -y -f image2 -framerate %i -i %%06d.png -vf crop=in_w-1:in_h-1 -b 3000k -qscale 1 output.wmv', this.framerate));
system(sprintf('ffmpeg -y -f image2 -framerate %i -i %%06d.png -vf crop="in_w-1:in_h-1, scale=-1:720" -b 2000k -qscale 1 output-720p.wmv', this.framerate));
system(sprintf('ffmpeg -y -f image2 -framerate %i -i %%06d.png -vf crop="in_w-1:in_h-1, scale=-1:480" -b 1500k -qscale 1 output-480p.wmv', this.framerate));
catch ex
ex
end
cd('..')
end
function clean(this)
% Deletes all created pngs
if isempty(this.projectName)
this.projectName = class(this);
end
this.init();
if exist(this.projectName, 'dir');
cd(this.projectName)
delete('./*.png')
cd('..')
end
end
end
methods (Access = private)
function encodeMatlab(this)
try
if ispc || ismac
vw = VideoWriter('output-matlab','MPEG-4');
else
% MATLAB on Linux does not support MPEG-4
vw = VideoWriter('output-matlab.avi');
end
vw.Quality = 100;
vw.FrameRate = this.framerate;
vw.open()
n = 1;
fprintf('encoding with MATLAB Videowriter\n');
while true
filename = sprintf('%06d.png', n);
if ~exist(filename,'file')
break
end
nBytes = fprintf('frame %i', n); %display progress
img1 = imread(filename);
img2 = imresize(img1, min(1088/size(img1,1),1920/size(img1,2)) ); %resize image to be no larger than 1088 x 1920
img3 = padarray(img2, mod([size(img2,1), size(img2,2)] ,4), 'replicate', 'post'); % pad to make size divisble by four
vw.writeVideo(img3);
fprintf(repmat('\b',1,nBytes))
n = n + 1;
end
vw.close()
catch ex
ex
end
end
function runVideo(this, saveImages)
n=0;
if strcmp(this.mode,'fw') || strcmp(this.mode,'fwbw')
for i=1:this.totalFrames
fprintf('frame %06d/%06d\n', i, this.totalFrames);
f1 = figure(1);
this.drawFrame(i);
if saveImages
n=n+1;
VideoFramework.saveFigure(f1, [this.projectName sprintf('/%06d', n)]);
end
end
end
if strcmp(this.mode,'bw') || strcmp(this.mode,'fwbw')
for i=this.totalFrames:-1:1
fprintf('frame %06d/%06d\n', i, this.totalFrames);
f1 = figure(1);
this.drawFrame(i);
if saveImages
n=n+1;
VideoFramework.saveFigure(f1, [this.projectName sprintf('/%06d', n)]);
end
end
end
end
end
methods (Abstract)
init(this)
drawFrame(this, nr)
end
methods (Static)
%saves the given figure as a PNG file
function saveFigure(fig, filename)
%preserve old settings
oldscreenunits = get(fig,'Units');
oldpaperunits = get(fig,'PaperUnits');
oldpaperpos = get(fig,'PaperPosition');
%change settings before saving
set(fig,'Units','pixels');
scrpos = get(fig,'Position');
newpos = scrpos/110;
set(fig,'PaperUnits','inches',...
'PaperPosition',newpos)
%save file
%print(fig,'-dpng', [filename '.png'], '-r300', '-painters');
print(fig,'-dpng', [filename '.png'], '-r300');
%restore old settings
set(fig,'Units',oldscreenunits,...
'PaperUnits',oldpaperunits,...
'PaperPosition',oldpaperpos)
end
end
end