Question

Guys I want to convert an avi file into yuv 420 video clip. Is there any method to do that? thx!

Answer 1

You can read an AVI file into MATLAB using the built-in mmreader class. Once you have the AVI frames read into a structure array of movie frames, you can save them as a YUV file using the saveFileYuv function found in this submission from the MathWorks File Exchange:

Convert YUV CIF 4:2:0 video file to image files by Da Yu

Your code might look something like this:

%# Get the video data:

vidObj = mmreader( myVideo.avi );  %# Create a video file object
nFrames = vidObj.NumberOfFrames;   %# Get the number of frames
vidHeight = vidObj.Height;         %# Get the image height
vidWidth = vidObj.Width;           %# Get the image width

%# Preallocate the structure array of movie frames:

mov(1:nFrames) = struct( cdata ,zeros(vidHeight,vidWidth,3, uint8 ),...
                         colormap ,[]);  %# Note that colormap is empty!

%# Read each video frame into the structure array:

for k = 1:nFrames
  mov(k).cdata = read(vidObj,k);  %# Place frame k in the cdata field of mov(k)
end

%# Save the movie frame array as a YUV 4:2:0 file:

saveFileYuv(mov, myVideo.yuv ,1);

Answer 2

I don t recommend using Matlab. What you want to do can easily be done using mplayer/mencoder... Why use Matlab for that ?

mencoder.exe -of rawvideo clock.avi -o clock.yuv -nosound -ovc raw

You may add -vf swapuv to swap the U and V components if the colrs aren t correct.

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