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Re: software for manipulating AVI files
From: |
Stefan van der Walt |
Subject: |
Re: software for manipulating AVI files |
Date: |
Sat, 1 Oct 2005 18:45:43 +0200 |
User-agent: |
Mutt/1.5.9i |
On Thu, Sep 29, 2005 at 12:36:37PM -0400, John W. Eaton wrote:
> Does anyone here know of any good free software (GPL compatible
> license required) for manipulating AVI files? I'd like to be able to
> implement the at least the following AVI functions in Octave:
>
> addframe Add frame to AVI file
> avifile Create new AVI file
> aviinfo Return information about AVI file
> aviread Read AVI file
> close Close AVI file
My previous email pointed to the FFMpeg wrapper at
http://www.dsp.sun.ac.za/~stefan, but didn't give any further detail.
For those interested, here are the docstrings of the functions
mentioned above.
-- Loadable Function: addframe (AVI, IMAGE)
Add a frame to an AVI file.
AVI is created using `avifile'. IMAGE must be of class `double'
and scaled to be in [0-1].
See also: avifile, aviread, aviinfo.
-- Loadable Function: F = avifile (FILENAME, [PARAMETER, VALUE, ...])
-- Loadable Function: avifile ("codecs")
Create an AVI-format video file.
The supported parameters are
`"compression"' or `"codec"'
The type of encoder used (default: `"msmpeg4v2"')
`"fps"'
Encoding frame rate per second (default: `25.0')
`"gop"'
Group-of-pictures - the number of frames after which a
keyframe is inserted (default: `10')
`"bitrate"'
Encoding bitrate (default: `400000')
To see a list of the available codecs, do `avifile("codecs")'.
See also: addframe, aviinfo, aviread.
-- Loadable Function: INFO = aviinfo (FILENAME)
Return the properties of an AVI file.
See also: avifile, aviread, addframe.
-- Loadable Function: IMAGE = aviread (FILENAME, N)
Load frame N from the AVI file FILENAME.
See also: avifile, aviinfo, addframe.
Here is an example snippet that utilises the wrapper:
# ----------------------------------------------
# Open the AVI file
m = avifile("test.avi", "codec", "msmpeg4v2")
# Generate and add frames
for i = 1:100
I = zeros(100,100);
I(i,:) = i;
I(:,i) = 200-i;
addframe(m, I/255)
printf(".")
endfor
printf("\n")
# Close the file
clear m
# ----------------------------------------------
Regards
Stéfan
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