How to create one .avi-video from a folder with i.png files?

Hi, I have a folder with 20000 .png files named 1.png, 2.png, and so on until 20000. I would like to make a .avi-video of it. The size of the entire folder is about 90MB. I read the documentation about the video writer but it did not address this specific problem.

I wonder if someone could help or suggest me which commands to load and and make the .png to a video file.

I thank you in advance for your help

Emerson

[Image Analyst]

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_a_movie_from_my_MATLAB_figures.3F

Answer 1

[Walter Roberson]

writerObj = VideoWriter('YourAVI.avi');
open(writerObj);
for K = 1 : 20000
  filename = sprintf('%d.png', K);
  thisimage = imread(filename);
  writeVideo(writerObj, thisimage);
end
close(writerObj);

[Emerson De Souza]

Hi Walter, thank you a lot for your help. Your code does exactly what I want. Only one more question: Is there a way to per-determine the playback rate, such as 6 frames per second or 60 frames per second? I assume that right now the avi is playing with 30fps and I would like to change it.

Thanks again for your help Emerson

[Emerson De Souza]

This time I got it by my own, I wrote:

writerObj.FrameRate=15;

before

open(writeObj

and that's it. I thank you again for the elegant script above. I would not know to write that at all.

Emerson

[Joydeb Saha]

I had the same problem and I used the Emerson's code. But how can I save the video? I just used the code that Emerson gave as an attachment.

[Walter Roberson]

Parts of the video may be written as you go, but there are internal buffers, so you should not rely upon frames being written as soon as you do the writeVideo() call. However, any buffered frames will be finalized and written when you close() the object.

Make sure that the name you gave in the VideoWriter() is the name of a file (with directory preferred) that you have write access to.