Mouse-threat-and-escape-CBRAIN/subfunc/parse_video_rgb.m

function parse_video_rgb()
%
% Parsing video (*.mp4/*.avi) file(s) into image (*.jpg) files
% Written by Hio-Been Han, 2023-08-23
%
%% (1) Get file info & set save directory
% [file_list, vid_directory] = uigetfile('*.*','MultiSelect','on');
vid_directory_single = './data_BIDS/stimuli/video/Single/';
vid_directory_group = './data_BIDS/stimuli/video/Group/';
if ~isdir('./data_BIDS/stimuli/video_parsed'), mkdir('./data_BIDS/stimuli/video_parsed'); end
write_directory_single = './data_BIDS/stimuli/video_parsed/Single/';
write_directory_group = './data_BIDS/stimuli/video_parsed/Group/';
if ~isdir(write_directory_single), mkdir(write_directory_single); end
if ~isdir(write_directory_group), mkdir(write_directory_group); end

file_counter = 1;
file_list = cell([3,64+8]);
% Single
for mouse = 1:8
    for day = 1:2
        for trial = 1:4
            file_list{1,file_counter} = vid_directory_single;
            file_list{2,file_counter} = sprintf('Day%d-Trial%d-Mouse%d.avi',day,trial,mouse);
            file_list{3,file_counter} = write_directory_single;
            file_counter = file_counter + 1;
        end
    end
end
% Group
for day = 1:2
    for trial = 1:4
        file_list{1,file_counter} = vid_directory_group;
        file_list{2,file_counter} = sprintf('Day%d-Trial%d-Group.avi',day,trial);
        file_list{3,file_counter} = write_directory_group;
        file_counter = file_counter + 1;
    end
end

%% (2) Parse & save video into JPEG files
save_format = '.jpg';
for fileIdx = 1:length(file_list)
    
    % Set save directory
    vid_directory = file_list{1,fileIdx};
    fname = file_list{2,fileIdx};
    img_directory = file_list{3,fileIdx};
    uniqname = fname(1:end-4);
    vidname = [vid_directory fname];
    save_directory = [img_directory uniqname '/'];
    if ~isdir(save_directory), mkdir(save_directory); end
    
    % Read frames
    v = VideoReader( [ vidname ]);
    nFrames = v.Duration * v.FrameRate;
    for frameIdx = 1:7200
        if v.hasFrame
            frame = v.readFrame();
            % Save frame
            imgname_write = [num2str(sprintf('frame-%06d',frameIdx))...
                '-' uniqname save_format];
            imwrite(frame , [ save_directory imgname_write ] )
        end
    end
end