[Ffmpeg-devel] [Fwd: ffmpeg dosen't produce M$ compatible adpcm_ima_wav]]

[sigsegv11]

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- -------- Original Message --------
Subject: [Fwd: ffmpeg dosen't produce M$ compatible adpcm_ima_wav]
Date: Tue, 06 Dec 2005 16:36:29 +0800
From: sigsegv11 <sigsegv11 at gmail.com>
To: ffmpeg-user at mplayerhq.hu


I'm using the the following command to fetch a adpcm_ima_wav from a movie:

	$ ffmpeg -i test.avi -acodec adpcm_ima_wav -ar 8000 -ac 1 -ab 32 test.wav

But the out file test.wav's format is not M$ adpcm ima wav
compatible(windoze recorder: sndrec32.exe can't play it), and I cound't
find any option handle with that. Is there any way to produce a M$
compatible adpcm_ima_wav format file? I can't use the current format
because our vendor can't only handle M$ compatible ima adpcm format.
Thanks in advance!

PS:

1) ffmpeg's IMA adpcm wave output header:

0000000: 5249 4646 2860 0c00 5741 5645 666d 7420  RIFF(`..WAVEfmt
0000010: 1400 0000 1100 0100 401f 0000 a00f 0000  ........ at .......
0000020: 0004 0400 0200 f907 6461 7461 0060 0c00  ........data.`..
0000030: 0000 0000 0000 0000 0000 0000 0000 0000  ................

2) M$ IMA adpcm wave output header:

0000000: 5249 4646 3407 0600 5741 5645 666d 7420  RIFF4...WAVEfmt
0000010: 1400 0000 1100 0100 401f 0000 d70f 0000  ........ at .......
0000020: 0001 0400 0200 f901 6661 6374 0400 0000  ........fact....
0000030: 2c07 0600 6461 7461 f806 0600 0000 0000  ,...data........

ffmpeg's wave output seems doesn't contain a fact segment.





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