How to use the scenedetect.video_manager.VideoFramerateUnavailable function in scenedetect

check_framerate = True
    cap_framerate = cap_framerates[0]
    if framerate is not None:
        if isinstance(framerate, float):
            if framerate < scenedetect.frame_timecode.MINIMUM_FRAMES_PER_SECOND_FLOAT:
                raise ValueError("Invalid framerate (must be a positive non-zero value).")
            cap_framerate = framerate
            check_framerate = False
        else:
            raise TypeError("Expected float for framerate, got %s." % type(framerate).__name__)
    else:
        unavailable_framerates = [(video_names[i][0], video_names[i][1]) for
                                  i, fps in enumerate(cap_framerates) if fps <
                                  scenedetect.frame_timecode.MINIMUM_FRAMES_PER_SECOND_FLOAT]
        if unavailable_framerates:
            raise VideoFramerateUnavailable(unavailable_framerates)
    return (cap_framerate, check_framerate)

error_strs = [
                'could not open video%s.' % get_plural(ex.file_list),
                'Failed to open the following video file%s:' % get_plural(ex.file_list)]
            error_strs += ['  %s' % file_name[0] for file_name in ex.file_list]
            dll_okay, dll_name = check_opencv_ffmpeg_dll()
            if not dll_okay:
                error_strs += [
                    'Error: OpenCV dependency %s not found.' % dll_name,
                    'Ensure that you installed the Python OpenCV module, and that the',
                    '%s file can be found to enable video support.' % dll_name]
            logging.debug('\n'.join(error_strs[1:]))
            if not dll_okay:
                click.echo(click.style(
                    '\nOpenCV dependency missing, video input/decoding not available.\n', fg='red'))
            raise click.BadParameter('\n'.join(error_strs), param_hint='input video')
        except VideoFramerateUnavailable as ex:
            error_strs = ['could not get framerate from video(s)',
                          'Failed to obtain framerate for video file %s.' % ex.file_name]
            error_strs.append('Specify framerate manually with the -f / --framerate option.')
            logging.debug('\n'.join(error_strs))
            raise click.BadParameter('\n'.join(error_strs), param_hint='input video')
        except VideoParameterMismatch as ex:
            error_strs = ['video parameters do not match.', 'List of mismatched parameters:']
            for param in ex.file_list:
                if param[0] == cv2.CAP_PROP_FPS:
                    param_name = 'FPS'
                if param[0] == cv2.CAP_PROP_FRAME_WIDTH:
                    param_name = 'Frame width'
                if param[0] == cv2.CAP_PROP_FRAME_HEIGHT:
                    param_name = 'Frame height'
                error_strs.append('  %s mismatch in video %s (got %.2f, expected %.2f)' % (
                    param_name, param[3], param[1], param[2]))

def __init__(self, file_name=None, file_path=None, message=
                 "OpenCV VideoCapture object failed to return framerate when calling "
                 "get(cv2.CAP_PROP_FPS)."):
        # type: (str, str, str)
        # Pass message string to base Exception class.
        super(VideoFramerateUnavailable, self).__init__(message)
        # Set other exception properties.
        self.file_name = file_name
        self.file_path = file_path

error_strs = [
                'could not open video%s.' % get_plural(ex.file_list),
                'Failed to open the following video file%s:' % get_plural(ex.file_list)]
            error_strs += ['  %s' % file_name[0] for file_name in ex.file_list]
            dll_okay, dll_name = check_opencv_ffmpeg_dll()
            if not dll_okay:
                error_strs += [
                    'Error: OpenCV dependency %s not found.' % dll_name,
                    'Ensure that you installed the Python OpenCV module, and that the',
                    '%s file can be found to enable video support.' % dll_name]
            logging.debug('\n'.join(error_strs[1:]))
            if not dll_okay:
                click.echo(click.style(
                    '\nOpenCV dependency missing, video input/decoding not available.\n', fg='red'))
            raise click.BadParameter('\n'.join(error_strs), param_hint='input video')
        except VideoFramerateUnavailable as ex:
            error_strs = ['could not get framerate from video(s)',
                          'Failed to obtain framerate for video file %s.' % ex.file_name]
            error_strs.append('Specify framerate manually with the -f / --framerate option.')
            logging.debug('\n'.join(error_strs))
            raise click.BadParameter('\n'.join(error_strs), param_hint='input video')
        except VideoParameterMismatch as ex:
            error_strs = ['video parameters do not match.', 'List of mismatched parameters:']
            for param in ex.file_list:
                if param[0] == cv2.CAP_PROP_FPS:
                    param_name = 'FPS'
                if param[0] == cv2.CAP_PROP_FRAME_WIDTH:
                    param_name = 'Frame width'
                if param[0] == cv2.CAP_PROP_FRAME_HEIGHT:
                    param_name = 'Frame height'
                error_strs.append('  %s mismatch in video %s (got %.2f, expected %.2f)' % (
                    param_name, param[3], param[1], param[2]))