2 ; CBR encoding quality [0..10]
3 ; used only when vbr = false
6 ; codec complexity [0..10]
7 ; tradeoff between cpu/quality
10 ; perceptual enhancement [true / false]
11 ; improves clarity of decoded speech
14 ; voice activity detection [true / false]
15 ; reduces bitrate when no voice detected, used only for CBR
16 ; (implicit in VBR/ABR)
19 ; variable bit rate [true / false]
20 ; uses bit rate proportionate to voice complexity
23 ; available bit rate [bps, 0 = off]
24 ; encoding quality modulated to match this target bit rate
25 ; not recommended with dtx or pp_vad - may cause bandwidth spikes
28 ; VBR encoding quality [0-10]
29 ; floating-point values allowed
32 ; discontinuous transmission [true / false]
33 ; stops transmitting completely when silence is detected
34 ; pp_vad is far more effective but more CPU intensive
37 ; preprocessor configuration
38 ; these options only affect Speex v1.1.8 or newer
40 ; enable preprocessor [true / false]
41 ; allows dsp functionality below but incurs CPU overhead
44 ; preproc voice activity detection [true / false]
45 ; more advanced equivalent of DTX, based on voice frequencies
48 ; preproc automatic gain control [true / false]
52 ; preproc denoiser [true / false]
55 ; preproc dereverb [true / false]
57 pp_dereverb_decay => 0.4
58 pp_dereverb_level => 0.3
62 ; for all codecs which do not support native PLC
63 ; this determines whether to perform generic PLC
64 ; there is a minor performance penalty for this