extractFrames.m

%% Load video and labels
videoFile = ''; % The video file to use
outputPath = ''; % The folder to save to
S = load(''); % The .mat file with the labels data
labels = S.gTruth.LabelData;

%% Extract frames to the outputPath
obj = VideoReader(videoFile);
fileCount = 0;
for i=1:size(labels)
    if (~isempty(labels(i,1).Water{1})) % Replace Water with whatever label name you are extracting
       obj.CurrentTime = seconds(labels(i,1).Time);
       im = obj.readFrame();
       fileCount = fileCount + 1;
       imwrite(im,sprintf('output%d.png',fileCount),'PNG');
    end
end