[Discussion] It's possible to use pipe with Spleeter?

I'm on Ubuntu and i've videos files.
I will know if it's possible to use the pipes with Spleeter because i want, firstly, convert my video files in wav format and after that use the pipeline with Spleeter and re-use a pipe to create waveforms.
For the moment, i'm trying that :

`ffmpeg -i myFile.mp4 -f wav - | spleeter separate -i - -p spleeter:2stems -o separated`

but i've errors like that:

Traceback (most recent call last):
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/multiprocessing/pool.py", line 121, in worker
result = (True, func(*args, **kwds))
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/site-packages/spleeter/audio/ffmpeg.py", line 108, in save
os.makedirs(directory)
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/os.py", line 221, in makedirs
mkdir(name, mode)
FileExistsError: [Errno 17] File exists: 'separated/-'
"""

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
File "/home/l2-rd4/workspace/anaconda3/bin/spleeter", line 8, in
sys.exit(entrypoint())
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/site-packages/spleeter/__main__.py", line 54, in entrypoint
main(sys.argv)
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/site-packages/spleeter/__main__.py", line 46, in main
entrypoint(arguments, params)
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/site-packages/spleeter/commands/separate.py", line 45, in entrypoint
separator.join()
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/site-packages/spleeter/separator.py", line 68, in join
task.get()
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/multiprocessing/pool.py", line 657, in get
raise self._value
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/multiprocessing/pool.py", line 121, in worker
result = (True, func(*args, **kwds))
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/site-packages/spleeter/audio/ffmpeg.py", line 108, in save
os.makedirs(directory)
File "/home/l2-rd4/workspace/anaconda3/lib/python3.7/os.py", line 221, in makedirs
mkdir(name, mode)
FileExistsError: [Errno 17] File exists: 'separated/-'
av_interleaved_write_frame(): Broken pipe
Error writing trailer of pipe:: Broken pipe
size= 1304kB time=00:00:06.93 bitrate=1540.9kbits/s speed=0.204x
video:0kB audio:1308kB subtitle:0kB other streams:0kB global headers:0kB muxing overhead: unknown
Conversion failed!

I can do the commands separately but with pipes I've problems . So if you have solutions, I'm listening.
Thanks!