How to specify maxrate?

[mbUSC]

        Representation(Size(1920, 1080), Bitrate(overall=13000000)),
        Representation(Size(854, 720), Bitrate(overall=10000000)),
        Representation(Size(854, 480), Bitrate(overall=4000000)),
        Representation(Size(854, 360), Bitrate(overall=2000000)),
        Representation(Size(426, 240), Bitrate(overall=1000000))

Despite specifying the bitrates manually, the encoded video ends up being off by quite a bit:

Error: Measured peak bitrate compared to multivariant playlist declared value exceeds error tolerance
--> Detail:  Measured: 31840.51 kb/s, Multivariant playlist: 13000.00 kb/s, Error: 144.93%
--> Source:  www/charge/charge.m3u8
--> Compare: charge_1080p.m3u8

--> Detail:  Measured: 2575.27 kb/s, Multivariant playlist: 1000.00 kb/s, Error: 157.53%
--> Source:  www/charge/charge.m3u8
--> Compare: charge_240p.m3u8

--> Detail:  Measured: 5062.86 kb/s, Multivariant playlist: 2000.00 kb/s, Error: 153.14%
--> Source:  www/charge/charge.m3u8
--> Compare: charge_360p.m3u8

--> Detail:  Measured: 9977.83 kb/s, Multivariant playlist: 4000.00 kb/s, Error: 149.45%
--> Source:  www/charge/charge.m3u8
--> Compare: charge_480p.m3u8

--> Detail:  Measured: 23697.42 kb/s, Multivariant playlist: 10000.00 kb/s, Error: 136.97%
--> Source:  www/charge/charge.m3u8
--> Compare: charge_720p.m3u8

Is there a way to specify maxrate?