MATLAB COMPILER RELEASE NOTES User's Guide download pdf (Page 185)

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Data Import and Export

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Data Import and Export

Reading and writing indexed and grayscale AVI files with VideoReader

and VideoWriter objects

The VideoReader.read method now returns an array of grayscale data when reading

grayscale AVI files. The read method also reads AVI files with indexed video and a

colormap using the new 'native' input argument.

The VideoWriter.writeVideo method now writes grayscale AVI files, and AVI files with

indexed video and a colormap.

Compatibility Considerations

A VideoReader object created from an AVI file with indexed video and a grayscale

colormap now has a VideoFormat property with the value 'Grayscale'. By default,

using the VideoReader.read method to read this object returns an m-by-n-by-1-by-F

array, where m is the image frame height, n is the image frame width, and F is the

number of frames read. In R2012b and earlier releases, the value of VideoFormat was

'RGB24' and read by default returned an m-by-n-by-3-by-F array.

Writing MPEG-4 H.264 files on Mac with VideoWriter object

VideoWriter now writes MPEG-4 H.264 files with the extension .mp4 or .m4v on systems

with Mac OS X 10.7 or later.

Tiff object improvements for reading and writing RGB-class TIFF images

The Tiff.readRGBAImage method returns RGBA data from an entire RGB-compatible

image. The Tiff.readRGBAStrip and Tiff.readRGBATile methods return RGBA data from

a single strip or a single tile in an RGB-compatible image, respectively.

The JPEGColorMode property for Tiff objects controls YCbCr/RGB conversion when

writing YCbCr images. For more information, see the Tiff reference page.

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