MATLAB: Is it possible to write an 8-bit depth single channel Uncompressed AVI file using VideoWriter in MATLAB 7.12 (R2011a)

8avibitMATLABuncompressedvideowriter

I am interested only in grayscale frames for my video. Hence, I would like to be able to write an 8-bit depth Uncompressed AVI file using VideoWriter instead of a 24-bit depth file. How can I do this?

Best Answer

This functionality is available as of Release 2013a (R2013a). For previous product releases, read below for any possible workarounds:

Currently the Uncompressed AVI option only writes 24-bit depth frames to an AVI file using VideoWriter.

There are no workarounds.

Related Solutions

MATLAB: Is it possible to use AVIREAD in 64-Bit Windows & MATLAB on AVI files created in 32-Bit Windows & MATLAB

A codec is the instructions for decoding (or encoding) video files from (or to) disk. Once a file is written to disk, it can be read by any codec that can be used by the application. MATLAB can read video files created by either 32-bit or 64-bit applications if the proper codec installed. For example, a 64-bit codec must be installed to read or write files in 64-bit MATLAB on 64-bit systems. However, if you wish to read or write a video file in 32-bit MATLAB on 64-bit systems, a 32-bit codec must be installed on the 64-bit system. Verify if the appropriate codec is installed. A list of video codecs installed in Windows can be viewed by clicking Start -> Programs -> Accessories -> System Tools -> System Information -> Components -> Multimedia -> Video Codecs.

As of MATLAB R2007b, MMREADER has been introduced to support more video file formats. Consider using MMREADER in replace of AVIREAD.

MATLAB: How to convert the video (>2 GB) to uncompressed AVI grayscale in MATLAB 7.12 (R2011a)

In order to use the VideoWriter to create an uncompressed AVI in grayscale, you need to create a VideoWriter object with the profile set to 'Uncompressed AVI'. Then create a movie structure that has grayscale frames by using the RGB2GRAY function and use the WRITEVIDEO function to write the frames in the movie to the AVI file. Then close the VideoWriter object using the CLOSE function.

Please refer to the following sample code:

% Read sample video.
xyloObj = VideoReader('xylophone.mpg');
% Get details.
nFrames = xyloObj.NumberOfFrames;
vidHeight = xyloObj.Height;
vidWidth = xyloObj.Width;
% Define colormap
map = [(0:255)' (0:255)' (0:255)']/255;
% Preallocate movie structure.
mov(1:nFrames) = struct('cdata', zeros(vidHeight, vidWidth, 'uint8'),'colormap', map);
% Read one frame at a time.
for k = 1 : nFrames
      mov(k).cdata = rgb2gray(read(xyloObj, k));
end
% Prepare the new file.
vidObj = VideoWriter('videowrite.avi','Uncompressed AVI');
open(vidObj);
% Write video
writeVideo(vidObj, mov);
% Close video writer object
close(vidObj);

Best Answer

Related Solutions

MATLAB: Is it possible to use AVIREAD in 64-Bit Windows & MATLAB on AVI files created in 32-Bit Windows & MATLAB

MATLAB: How to convert the video (>2 GB) to uncompressed AVI grayscale in MATLAB 7.12 (R2011a)

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