python silent output

edit

hello yes it seems that the only way is recompile ffmpeg with -disable-logging

There is a python solution to silent it: the idea is to redirect the sterr (where ffmpeg library push the log) "elsewhere" only when this function is executed:
I use the way explain by this very good blog article

 `import ctypes
import io
import os
import sys
import tempfile
from contextlib import contextmanager

import cv2

libc = ctypes.CDLL(None)
c_stderr = ctypes.c_void_p.in_dll(libc, 'stderr')


def screenshot(url):
    vidcap = cv2.VideoCapture(url)
    # do stuff in vidcap
    vidcap.release()


@contextmanager
def stderr_redirector(stream):
    original_stderr_fd = sys.stderr.fileno()

    def _redirect_stderr(to_fd):
         libc.fflush(c_stderr)
          sys.stderr.close()
          os.dup2(to_fd, original_stderr_fd)
          sys.stderr = io.TextIOWrapper(os.fdopen(original_stderr_fd, 'wb'))

    saved_stderr_fd = os.dup(original_stderr_fd)
    try:
          tfile = tempfile.TemporaryFile(mode='w+b')
          _redirect_stderr(tfile.fileno())
          yield
          _redirect_stderr(saved_stderr_fd)
          tfile.flush()
          tfile.seek(0, io.SEEK_SET)
          stream.write(tfile.read().decode())
    finally:
          tfile.close()
          os.close(saved_stderr_fd)


url = "udp://224.X.X.X:1234"
f = io.StringIO()
with stderr_redirector(f):
    screenshot(url)

# you can get the ffmpeg log with  f.getvalue() for analyze or just close it
f.close()`