How to use the m3u8.IFramePlaylist function in m3u8

'resolution': '624x352',
                     'codecs': 'avc1.4d001f, mp4a.40.5',
                     'subtitles': 'subs'},
        media=[subtitles],
        base_uri='http://example.com/'
    )
    high_playlist = m3u8.Playlist(
        uri='video-1200k.m3u8',
        stream_info={'bandwidth': 1200000,
                     'program_id': 1,
                     'codecs': 'avc1.4d001f, mp4a.40.5',
                     'subtitles': 'subs'},
        media=[subtitles],
        base_uri='http://example.com/'
    )
    low_iframe_playlist = m3u8.IFramePlaylist(
        uri='video-800k-iframes.m3u8',
        iframe_stream_info={'bandwidth': 151288,
                            'program_id': 1,
                            'closed_captions': None,
                            'resolution': '624x352',
                            'codecs': 'avc1.4d001f'},
        base_uri='http://example.com/'
    )
    high_iframe_playlist = m3u8.IFramePlaylist(
        uri='video-1200k-iframes.m3u8',
        iframe_stream_info={'bandwidth': 193350,
                            'codecs': 'avc1.4d001f'},
        base_uri='http://example.com/'
    )

    variant_m3u8.add_playlist(low_playlist)

'program_id': 1,
                     'codecs': 'avc1.4d001f, mp4a.40.5',
                     'subtitles': 'subs'},
        media=[subtitles],
        base_uri='http://example.com/'
    )
    low_iframe_playlist = m3u8.IFramePlaylist(
        uri='video-800k-iframes.m3u8',
        iframe_stream_info={'bandwidth': 151288,
                            'program_id': 1,
                            'closed_captions': None,
                            'resolution': '624x352',
                            'codecs': 'avc1.4d001f'},
        base_uri='http://example.com/'
    )
    high_iframe_playlist = m3u8.IFramePlaylist(
        uri='video-1200k-iframes.m3u8',
        iframe_stream_info={'bandwidth': 193350,
                            'codecs': 'avc1.4d001f'},
        base_uri='http://example.com/'
    )

    variant_m3u8.add_playlist(low_playlist)
    variant_m3u8.add_playlist(high_playlist)
    variant_m3u8.add_iframe_playlist(low_iframe_playlist)
    variant_m3u8.add_iframe_playlist(high_iframe_playlist)

    expected_content = """\
#EXTM3U
#EXT-X-MEDIA:URI="english_sub.m3u8",TYPE=SUBTITLES,GROUP-ID="subs",\
LANGUAGE="en",NAME="English",DEFAULT=YES,AUTOSELECT=YES,FORCED=NO
#EXT-X-STREAM-INF:PROGRAM-ID=1,BANDWIDTH=800000,RESOLUTION=624x352,\

iframe_playlist.add_segment(iframe_segment)

        total_bytes += s_bytes
        total_duration += s_duration

    if total_bytes != 0 and total_duration != 0:
        iframe_bandwidth = str(int(total_bytes / total_duration * 8))
    else:
        return (None, None)

    iframe_codecs = convert_codecs_for_iframes(playlist.stream_info.codecs)
    stream_info = {'bandwidth': iframe_bandwidth,
                   'codecs': iframe_codecs}
    iframe_playlist_uri = playlist.uri.replace('.m3u8', '-iframes.m3u8')

    new_iframe_playlist = m3u8.IFramePlaylist(base_uri=playlist.base_uri,
                                              uri=iframe_playlist_uri,
                                              iframe_stream_info=stream_info)

    return (new_iframe_playlist, {'uri': iframe_playlist_uri,
                                  'content': iframe_playlist.dumps()})