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Compress an existing AVI file?

I have an AVI file which I want to be able to open and compress and then resave.

The purpose of this is to be able to take an uncompressed AVI file and compress with various options to compare file sizes.

I am familiar with reading in AVI streams, but am uncertain on how to take existing uncompressed streams and compress them.

Thanks,

Don

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chensu

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dmetzler

ASKER

So, basically, read in all the streams and then write them out to a new file with the AVICOMPRESSOPTIONS structure set?

chensu

Right.

dmetzler

ASKER

Thanks...

dmetzler

ASKER

Chensu,

I have my AVI streams loaded (2, actually - one DIB image and one WAV stream). If I try to manipulate the fccHandler to 'MSVC' then the AVISaveV() function fails.

Where can I details about the results of a AVISaveV() failure?

Now - if I use the AVISaveOptions() function and select "Microsoft Video 1" then the compression is valid in the file (though the single image frame AVI does not change size from the original).

Can you help?

Thanks,

Don

chensu

// From vfw.h, hope this helps.

#ifndef AVIERR_OK
#define AVIERR_OK 0L

#define MAKE_AVIERR(error)      MAKE_SCODE(SEVERITY_ERROR, FACILITY_ITF, 0x4000 + error)

// !!! Questions to be answered:
// How can you get a string form of these errors?
// Which of these errors should be replaced by errors in SCODE.H?
#define AVIERR_UNSUPPORTED MAKE_AVIERR(101)
#define AVIERR_BADFORMAT MAKE_AVIERR(102)
#define AVIERR_MEMORY MAKE_AVIERR(103)
#define AVIERR_INTERNAL MAKE_AVIERR(104)
#define AVIERR_BADFLAGS MAKE_AVIERR(105)
#define AVIERR_BADPARAM MAKE_AVIERR(106)
#define AVIERR_BADSIZE MAKE_AVIERR(107)
#define AVIERR_BADHANDLE MAKE_AVIERR(108)
#define AVIERR_FILEREAD MAKE_AVIERR(109)
#define AVIERR_FILEWRITE MAKE_AVIERR(110)
#define AVIERR_FILEOPEN MAKE_AVIERR(111)
#define AVIERR_COMPRESSOR MAKE_AVIERR(112)
#define AVIERR_NOCOMPRESSOR MAKE_AVIERR(113)
#define AVIERR_READONLY            MAKE_AVIERR(114)
#define AVIERR_NODATA            MAKE_AVIERR(115)
#define AVIERR_BUFFERTOOSMALL      MAKE_AVIERR(116)
#define AVIERR_CANTCOMPRESS      MAKE_AVIERR(117)
#define AVIERR_USERABORT MAKE_AVIERR(198)
#define AVIERR_ERROR MAKE_AVIERR(199)

dmetzler

ASKER

Yes - I am familiar with those, but the return code is a rather large number (something like 250938793 as a DWORD).

Will get exact results and post them.

dmetzler

ASKER

Chensu,

The exact result from AVISaveV() is: 2147762289 (DWORD).

chensu

That is AVIERR_NOCOMPRESSOR, meaning that you don't have that CODEC installed.

AVIERR_NOCOMPRESSOR is MAKE_SCODE(SEVERITY_ERROR, FACILITY_ITF, 0x4000 + 113) instead of 113.

dmetzler

ASKER

Thanks...guess I need to look at the MAKE_SCODE macro.

Don