On 12-09-24 11:59 AM, Alexey Aylarov wrote: > As I understand Opus was only discussed as a solution for wideband audio > so far… Opus supports narrowband as well as wideband (and several bandwidth steps in-between). The sender side can configure the encoder to use this mode. The reference encoder will also switch to narrowband automatically when a appropriately low bitrate is requested. The RTP payload draft[*] defines a maxcodedaudiobandwidth SDP parameter the receiver can use to indicate a preference for narrowband. However, because all of this is dynamically switchable in Opus, it is recommended that receivers always implement fullband unless they have a specific hardware limitation which prevents supporting that. In that case they can take advantage of higher quality audio when appropriate, while still scaling down to narrowband when that's what the sender ends up encoding. -r [*] http://tools.ietf.org/html/draft-spittka-payload-rtp-opusReceived on Monday, 24 September 2012 19:29:52 UTC
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