ffmpeg и звук

pcm.!default {
    type plug
    slave {
        pcm rate44100Hz # Direct default output to the below converter
    }
}

pcm.rate44100Hz {
    type rate
    slave {
        pcm writeFile # Direct to the plugin which will write to a file
        format S16_LE
    #    channels 2
        rate 44100
    }
    #route_policy copy
}

pcm.writeFile {
    type file
    slave {
        pcm card0 # Now write to the actual sound card
    }
    file "/tmp/aplay-D_card0-t_raw-f_S16_LE-r44100-c_2.raw"
    format "raw"
}

pcm.card0 {
    type hw
    card 0
}

ctl.card0 {
    type hw
    card 0
}