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import json
import subprocess
from ._run import Error
from ._utils import convert_kwargs_to_cmd_line_args
def probe(filename, cmd='ffprobe', **kwargs):
"""Run ffprobe on the specified file and return a JSON representation of the output.
Raises:
:class:`ffmpeg.Error`: if ffprobe returns a non-zero exit code,
an :class:`Error` is returned with a generic error message.
The stderr output can be retrieved by accessing the
``stderr`` property of the exception.
"""
args = [cmd, '-show_format', '-show_streams', '-of', 'json']
args += convert_kwargs_to_cmd_line_args(kwargs)
args += [filename]
p = subprocess.Popen(args, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
out, err = p.communicate()
if p.returncode != 0:
raise Error('ffprobe', out, err)
return json.loads(out.decode('utf-8'))
__all__ = ['probe']
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