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I would like to capture audio with ffmpeg in .raw format. Here is what I do to capture in .mp3 format :

ffmpeg -f dshow -t 10 -i audio="virtual-audio-capturer" -y "sound.mp3"

note that I don't want to capture in .mp3 then convert in .raw

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Use sound.wav as your output, instead of sound.mp3. Or if you literally mean raw PCM data with no headers, not just uncompressed, then try

ffmpeg -f dshow -t 10 -i audio="virtual-audio-capturer" -f s16le -y "sound.pcm"

Play it back with

ffplay -channels 2 -f s16le -i sound.pcm

Unless you really need headerless, I'd suggest WAV files for ease of use. Sample format, rate, and number of channels stored in the file is a Good Thing.

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