Re: software for manipulating AVI files

[Brendan Drew]

That, I'm afraid, I couldn't tell you. I try to stay away from canned 
sequences on principle (this way it's much harder to optimize algorithms 
to work only with one particular sequence, which makes it a bit easier 
to design for good general performance)

I vaguely recall something about using Windows BMPs as the frame data 
with the header data stripped and not being able to use   colors > 236 
in any channel, but don't quite me on that -- I may be confusing 
uncompressed AVI with CinePak.

John W. Eaton wrote:

> On 29-Sep-2005, Brendan Drew wrote:
>
> | Unfortunately, the AVI file format is not quite as simple as one would 
> | want to believe. AVI is merely a container format, it makes no 
> | statements about how things are compressed or decompressed. Depending on 
> | the codecs you're using, things can become very complicated very quickly 
> | (specifying which codec and then specific parameters for that codec, 
> | followed by relevant sanity checking, correctly matching AVI streams to 
> | codecs when you have multiple versions to choose between, etc.)
>
> OK, I see that now.  I suppose my question displayed my ignorance of
> the situation.  I assumed that "AVI file" was well defined.
>
> OK, so suppose we don't care about handling anything more than being
> able to read and write the kinds of AVI files that Matlab produces?
> Would that be hard to write?  I'm looking at
>
> http://msdn.microsoft.com/archive/default.asp?url=/archive/en-us/directx9_c/directx/htm/avirifffilereference.asp
>
> Given this, I think I can write code that will decode the file I have
> (generated with avifile and addframe with no compression).  So the
> question I have now is, how is the frame data stored for this kind of
> file?
>
> jwe
>  


--
Brendan Drew
Research Scientist
PercepTek, Inc.
12395 North Mead Way
Littleton, CO 80125
Tel: 720-344-1037 x 126
Fax: 720-344-2360



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