I would like to create a video file with the .gif extension (using ffmpeg if possible)!!!

Please understand that I cannot upload my files due to capacity limitations. : - (

In the case of ffmpeg, I downloaded the Windows version - compressed ffmpeg folder (ffmpeg-git-essentials.7z) from https://www.gyan.dev/ffmpeg/builds/ , unzipped it, and changed the outermost folder name to 'ffmpeg'.

While doing my homework, I'm trying to convert the 'zeta' item in a nc(NetCDF) file into a video with a .gif extension. The problem is, every time I run this code (HW_06) it keeps telling me that the profile I specified is invalid. I am currently using the internal ffmpeg.exe file to create a gif file. Below is the code I am using right now. What should I fix in this code to create a video with a .gif extension? nc files were read normally, and 289 PNG images were also printed normally.

clear all; close all; clc;

%% Directory %%

pwd;

mkdir('01__Data')

mkdir('02__Figure')

inp.dir = fullfile(pwd, '01__Data');

fig.dir = fullfile(pwd, '02__Figure');

ffmpegPath = fullfile(pwd, '01__Data', 'ffmpeg', 'bin');

ffmpegRelativePath = fullfile(ffmpegPath, 'ffmpeg.exe');

output_directory = ['01__Time_series'];

output_directory1 = ['01_Zeta'];

output_directory2 = ['02_Salinity'];

mkdir([output_directory,'/',output_directory1]);

mkdir([output_directory,'/',output_directory2]);

%% Model data reading %%

tp = dir('*.nc');

% 파일 이름 목록 정의

file_names = {'homework_0001.nc', 'homework_0002.nc', 'homework_0003.nc'};

% 파일 경로와 이름을 결합하여 읽을 파일 목록 생성

filn = fullfile(inp.dir, file_names);

for i = 1:length(filn)

x = ncread(filn{i},'x');

y = ncread(filn{i},'y');

xc = double(ncread(filn{i},'xc'));

yc = double(ncread(filn{i},'yc'));

lon = ncread(filn{i},'lon');

lat = ncread(filn{i},'lat');

lonc = double(ncread(filn{i},'lonc'));

latc = double(ncread(filn{i},'latc'));

node_number = length(x);

cell_number = length(xc);

nv = ncread(filn{i},'nv');

time = double(ncread(filn{i},'time'))';

zeta = ncread(filn{i},'zeta');

salinity = ncread(filn{i},'salinity');

%% Plot (Zeta) %%

for i = 1:length(time)

figure('visible','off')

set(gca,'fontname','Arial','fontweight','bold','fontsize',15,'Box','on');

hold on

set(gcf,'color','w','Units','Normalized','OuterPosition',[0.1 0.1 0.7 0.4]);

patch('Faces',nv,'Vertices',[x,y],'FaceColor','w','linewidth',1);

patch('Faces',nv,'Vertices',[x,y],'FaceColor','w','linestyle','none');

patch('Faces',nv,'Vertices',[x,y],'FaceVertexCData',zeta(:,i),'FaceColor','flat','LineStyle','none');

% patch('Faces',nv,'Vertices',[x,y],'FaceVertexCData',salinity(:,i),'FaceColor','flat','LineStyle','none');

axis equal;

colormap('jet');

c = colorbar;

caxis([-3 3]);

% caxis([30 32]);

% c.Ticks = [-3: 1: 3];

c.Label.String = 'Zeta (m)';

% c.Label.String = 'Salinity (psu)';

c.Label.FontSize = 18;

xlabel('Distance (m)','FontSize',18,'FontWeight','bold')

ylabel('Distance (m)','FontSize',18,'FontWeight','bold')

title(datestr(time(i),'dd HH:MM:SS'),'fontsize',20,'fontweight','bold')

print([output_directory,'/',output_directory1,'/','Tide_',datestr(time(i),'dd HH_MM_SS')],'-dpng')

% print([output_directory,'/',output_directory2,'/','Sal_',datestr(time(i),'dd HH_MM_SS')],'-dpng')

end

end

%% Video (Zeta) %%

outputVideoFileName1 = fullfile(fig.dir, 'HW_06_Zeta.gif');

pngDirectory1 = fullfile(pwd, '01__Time_series', '01_Zeta');

outputVideo1 = VideoWriter(outputVideoFileName1, 'FFmpeg');

outputVideo1.FrameRate = 10;

outputVideo1.FileFormat = 'gif';

open(outputVideo1);

for i = 1:length(time)

time_str = datestr(time(i), 'dd HH_MM_SS');

img = imread(fullfile(pngDirectory1, ['Tide_', time_str, '.png']));

writeVideo(outputVideo1, img);

end

close(outputVideo1);

Answer 1

[Angelo Yeo]

VideoWriter 문서에 기재되어 있는 것 처럼 이 함수는 'FFmpeg'라는 프로파일을 지원하지 않습니다. 더군다나 ffmpeg는 동영상의 profile이 아닙니다. (FFmpeg is a collection of libraries and tools to process multimedia content such as audio, video, subtitles and related metadata. 소스)

또, gif 출력을 위해서 VideoWriter 대신에 exportgrahics의 GIF로 내보내기 기능을 사용해보는 건 어떨까요?