We do not provide direct control over bitrate, but you are able to switch between AVC (h.264) and HEVC (h.265) for both platforms (keep in mind that support for HEVC is dependent on the device and OS version, as older iPhones and Android do not support it and only work with AVC).
h.265 is used by default if the device supports it for both platforms, but it IS possible to turn it off.
For Android: you can use
ExportParams and set it to false:
val params = ExportParams(
useHevcIfPossible = false
For iOS: please use
useHEVCCodecIfPossible in a similar manner (default is true).