On Fri, 10 Jun 2022, Joe Dupré wrote:
Hello,
I have 48K/24bit stereo CAF files that I need to convert to 48K/24bit WAV
files.
"ffmpeg -i infile.caf outfile.wav" produces a 48K/16bit WAV file that I can
open with Sound Forge 6.0.
"ffmpeg -i infile.caf -c pcm_s24le outfile.wav" produces a 48K/24bit WAV file
that I CANNOT open with Sound Forge 6.0.
I tried a commercial software utility called "Switch" by NCH Software that
can produce a 48K/24bit WAV file that IS readable by Sound Forge 6.0.
I next compared the file header of the two WAVE files. Bytes 21-22 are
supposed to hold the format type, which is supposed to be 1 for PCM. In the
ffmpeg produced file, bytes 21-22 are "FF FF". In the Switch produced file
they are "01 00".
Why is ffmpeg using "FF FF" for format type? Is there some ffmpeg option
that can specify a format type of 1?
Actually it supposed to be FE FF, are you sure are you seeing FF FF?
FE FF is WAVEFORMATEXTENSIBLE format which should be used for > 16bit
audio according to MSDN:
https://docs.microsoft.com/en-us/windows/win32/api/mmeapi/ns-mmeapi-waveformatex
You can't tune this unfortunately.
Regards,
Marton
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