Problem outputing an audio file in 24 bit

Hi !

I’m encoutering a problem with writting an audio file to the disk.

I want to have a mono file encoded in 24bit to use it in CDP analysing it with PVOC Anal and then use it in a program like Spectwin. To achieve this the two analysis files need to have the same bit definition or I get an error message.

My first sound used is written with reaper and the second one comes from csound. But whatever I try in the command line its always encoded in 16bits. My csd is executed from CsoundQt but I get the same thing when I execute it from a terminal.

Here is the begining of my csd:

-B 256 -b 128


sr = 44100
ksmps = 64
nchnls = 1
0dbfs = 1

Hope it’s not too confuse. I know it sounds dumb but it’s been one hour I’m stuck with that and I can’t understand the problem.

Have a good day,



Use “csound --help” from the terminal or check the manual:

Thanks for your response,

I already tried the flags: --fromat=24bit or -3 with no results

Also, when I don’t write the file extension explicitly and want to specify it using the --format=type flag the file is still written with no header.

As if the flags for the output on the disk weren’t working for me…

That is rather odd. The following works perfectly for me on Android, Windows & Mac:

-o filename.wav --format=24bit


-o filename.wav --format=float

for 32 bit float.

If you still can’t get that to work you could try fout and if needed the monitor opcode. Here’s an ex:

; -o filename.wav --format=24bit

sr = 44100
ksmps = 32
nchnls = 2
0dbfs  = 1

instr Play
  iFreq ftgen 1, 0, 0, 2, 220, 440, 880
  aSig  = oscil:a(line:a(.4,p3,0),tab:k(lfo(randomh:k(0,2,4),4,3),1))
  outs(aSig, aSig)

instr Monitor, Record
  aL, aR monitor
; iformat = type * 10 + sample format
; 14 = wav, 16 bit
; 18 = wav, 24 bit
; 16 = wav, 32 bit float
  iFormat = 18
  fout "/dir/filename.wav", iFormat, aL, aR

i"Play"    0 16
i"Monitor" 0 16