User Manual

Bria Android Tablet Edition User Guide
59
Codecs Selection
Codecs are programs in Bria involved in transmitting audio; each codec has different characteri stics and
therefore each works better in some situations than in others.
In general, it i s desi rable to hav e several co decs enab led . Make sure th at there a re common codecs between you
and the remote peer, otherwise your call will fail with a 488 error.
SILK-SuperWideband (24k) and Opus-Fullband (48k) are available only in devices with 1.2 GHz dual core
CPU or higher. These codecs will be disabled on any slower devices.
Novice and Non-technical Users
We recommend you use the default setting/ prio ri ty and le t Bria select the best codec t o u s e in a g iv en si tu ati on .
Technically Savvy Users
You may choose to enable one, some or all codecs. If only one codec is enabled, all cal ls will be ma de with that
codec. If more than one is enabled, Bria negotiates the codec to use (from among the enabled codecs) with the
other person. If no codecs are enabled, Bria uses G.711u.
You can prioritize codecs by tapp ing the Up or D own icon in th e list. Codecs higher in the l ist are given a higher
priority in the offer, when negotiating codecs with the other party. Therefore, moving a codec higher should
improve its chances of being chosen.
G.722, AMR-WB, SILK-WB, SILK-SWB (24kHz), and Opus-Full HD (48kHz) are wideband codecs. All
other codecs are narrowband. When a wideband codec is used, data usage will be higher and audio quality will
generally be better. When a narrowband codec is used, data usag e may be lower but audio quality may be
affected.
Data usage for the codecs with a fixed bit rate, from high to low usage, is: G.722, G.711, iLBC, GSM, G.729a.
AMR-WB, SILK and OPUS have a variable bit rate; the data usage will fluctuate depending on the network
conditions. The optional G.729a codec will provide you the best perform an ce (audio quality and ban dwi dth
usage/cost) when using mobile network for phone calls.