mpeg file
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Hi
I have two task that are similar that I dont know how to do:
1 - I want to be able to import an mpeg video and save each frame of this movie as individual images into a folder.
2 - Also, I want to be able to create an mpeg video given a number of individual images saved in a folder.
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Walter Roberson
2011-7-19
If you have a new enough MATLAB version, you could perhaps us the VideoReader class; older versions called it the mmreader. Extract frame by frame and use imwrite(). See http://matlab.wikia.com/wiki/FAQ#How_can_I_process_a_sequence_of_files.3F for information on automatic filename generation for such purposes.
Given a series of frames read in by imread() (in conjunction with dir() to find the file names), you can use the VideoWriter() class to produce a .avi .
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James
2011-7-20
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Walter Roberson
2011-7-21
Yes, double() keeps the same numeric values, such as uint8(42) becoming the double precision number 42.0. That is fine for some kinds of computations, but if you try to display or imwrite() a double precision array with such values you will have problems, as the expected range for representing graphics in double precision variables is 0 to 1. im2double() converts the data type _and_ rescales the values to be in the range 0 to 1.
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