Frames to video conversion

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Lalit Patil
Lalit Patil 2013-2-5
回答： yanqi liu 2021-2-1
aviObject = avifile('Myvid1.avi')
for ctr = 441:500
iFrame = clock;
fname = ['IMG' num2str(ctr),'.PNG'];
I = imread(fname);
F = im2frame(I);
aviObject = addframe(aviObject,I);
elapsed = etime(clock, iFrame);
pause(5 - elapsed);
end
aviObject = close(aviObject);
This is my code to create video from frames.. It shows error..
??? Error using ==> im2frame
Indexed movie frame must have a non-empty colormap
Why..? My images are 600*800uint8 type..

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采纳的回答

Walter Roberson
Walter Roberson 2013-2-5
[I, cmap] = imread(fname);
F = im2frame(I, cmap);
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显示 1更早的评论
Walter Roberson
Walter Roberson 2013-2-5
Before the loop:
cmap = gray(256);
Then in the loop,
I = imread(fname);
F = im2frame(I, cmap);
SETTE Houda
SETTE Houda 2021-1-5
@Lalit Patil how did you reserve this problem please ?

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更多回答（1 个）

yanqi liu
yanqi liu 2021-2-1
（1）demo1
use video to images
function Video2Images(videoFilePath)
clc;
if nargin < 1
videoFilePath = 'traffic.avi';
end
nFrames = GetVideoImgList(videoFilePath);
function nFrames = GetVideoImgList(videoFilePath)
% 获取视频图像序列
% 输入参数：
% vidioFilePath——视频路径信息
% 输出参数：
% videoImgList——视频图像序列
xyloObj = VideoReader(videoFilePath);
nFrames = xyloObj.NumberOfFrames;
vidHeight = xyloObj.Height;
vidWidth = xyloObj.Width;
[pathstr, name, ext] = fileparts(videoFilePath);
video_imagesPath = fullfile(pwd, sprintf('%s_images', name));
if ~exist(video_imagesPath, 'dir')
mkdir(video_imagesPath);
end
files = dir(fullfile(video_imagesPath, '*.jpg'));
if length(files) == nFrames
return;
end
h = waitbar(0, '', 'Name', '获取视频图像序列...');
steps = nFrames;
for step = 1 : nFrames
temp = read(xyloObj, step);
temp_str = sprintf('%s\\%04d.jpg', video_imagesPath, step);
imwrite(temp, temp_str);
pause(0.01);
waitbar(step/steps, h, sprintf('已处理：%d%%', round(step/nFrames*100)));
end
close(h)
(2) demo2
use images to video
function Images2Video(imgFilePath, filename_out)
if nargin < 2
imgFilePath = fullfile(pwd, 'traffic_images');
filename_out = fullfile(pwd, 'out.avi');
end
% 清理空间
clc;
% 起始帧
startnum = 1;
% 默认结束帧为jpg图像数目
endnum = size(ls(fullfile(imgFilePath, '*.jpg')), 1);
% 创建对象句柄
writerObj = VideoWriter(filename_out);
% 设置帧率
writerObj.FrameRate = 24;
% 开始打开
open(writerObj);
% 进度条
h = waitbar(0, '', 'Name', 'Write Video File...');
% 总帧数
steps = endnum - startnum;
for num = startnum : endnum
% 当前序号的名称
file = sprintf('%04d.jpg', num);
% 当前序号的位置
file = fullfile(imgFilePath, file);
% 读取
frame = imread(file);
% 转化为帧对象
frame = im2frame(frame);
% 写出
writeVideo(writerObj,frame);
% 刷新
pause(0.01);
% 进度
step = num - startnum;
% 显示进度条
waitbar(step/steps, h, sprintf('Process：%d%%', round(step/steps*100)));
end
% 关闭句柄
close(writerObj);
% 关闭进度条
close(h);

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