def parse_metadata_field_value(
        self,
        line,
    ):
        """Returns a tuple with a metadata field-value pair given a ffmpeg `-i`
        command output line.
        """
        info = line.split(":", 1)
        if len(info) == 2:
            raw_field, raw_value = info
            return (raw_field.strip(" "), raw_value.strip(" "))
        else:
            return ("", "")
Returns a tuple with a metadata field-value pair given a ffmpeg `-i`
        command output line.
        
moviepy/video/io/ffmpeg_reader.py