pdftoppm -v version info send to stderr

tested with 0.80.0 and 0.71.0

pdftoppm -v 1> /dev/null # does still output the version info

cmd = [
    "pdftoppm",
    "-v"
]

with subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE) as p:
    output, err = p.communicate()
    print("err: %s" % err)

prints the version info as err: <version info>

Edited Nov 07, 2019 by Ferenc Radius

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