It seems that when I'm using fdkaac (the only mac encoder available now from the looks of it) the highest bitrate it will output is 64k
This is what I have configured... output.shoutcast(%fdkaac(channels=2,bitrate=256,samplerate=44100),icy_id=5,icy_metdata="true", name="Radio - 256k HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port = 80,password = "radio:#5",radio) output.shoutcast(%fdkaac(channels=2,bitrate=128,samplerate=44100),icy_id=6,icy_metdata="true",name="Radio - 128k HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port = 80,password = "radio:#6",radio) output.shoutcast(%fdkaac(channels=2,bitrate=64,samplerate=44100),icy_id=7,icy_metdata="true",name="Radio - 64k HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port = 80,password = "radio:#7",radio) output.shoutcast(%fdkaac(channels=2,bitrate=24,samplerate=44100),icy_id=8,icy_metdata="true",name="Radio - 24k HE-AACv2",genre="Genre",url="https://www.domain.com",host="127.0.0.1",port = 80,password = "radio:#8",radio) I have a separate script thats basically the same but its outputting mp3 (to the first 4 sid's on the sc_serv) The Shoutcast status page reports the correct bitrate, but reports half the sample rate HE-AAC @ 256 kbps, 22.05 kHz HE-AAC @ 128 kbps, 22.05 kHz HE-AAC @ 64 kbps, 22.05 kHz HE-AAC @ 24 kbps, 22.05 kHz Odd.. ok... lets have a closer look... $ ffprobe -hide_banner http://127.0.0.1/stream/?sid=5 Input #0, aac, from 'http://127.0.0.1/stream/?sid=5': Metadata: icy-notice1 : <BR>This stream requires <a href="http://www.winamp.com";>Winamp</a><BR> icy-notice2 : SHOUTcast DNAS/posix(linux x64) v2.5.1.724<BR> icy-name : Radio icy-genre : Genre icy-br : 256 icy-sr : 22050 icy-url : https://www.domain.com icy-pub : 1 Duration: N/A, bitrate: 62 kb/s Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 62 kb/s So liquidsoap is sending the configured bitrate, and half the configured samplerate as metadata But is actually sending at 64kbps 44100 Hz A look at the 24k... icy-br : 24 icy-sr : 22050 icy-url : https://www.domain.com icy-pub : 1 Duration: N/A, bitrate: 22 kb/s Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 22 kb/s Ok its got the bitrate and the sample rate correct in the actual stream, but again fails at the icy-sr at only half And for the 128k... icy-br : 128 icy-sr : 22050 icy-url : https://www.domain.com icy-pub : 1 Duration: N/A, bitrate: 64 kb/s Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 64 kb/s And the 64k... icy-br : 64 icy-sr : 22050 icy-url : https://www.domain.com icy-pub : 1 Duration: N/A, bitrate: 66 kb/s Stream #0:0: Audio: aac (HE-AACv2), 44100 Hz, stereo, fltp, 66 kb/s Now lets try mediainfo 256k General Complete name : http://127.0.0.1/stream/?sid=5 Format : ADTS Format/Info : Audio Data Transport Stream Overall bit rate mode : Variable Audio Format : AAC Format/Info : Advanced Audio Codec Format version : Version 4 Format profile : HE-AACv2 / HE-AAC / LC Bit rate mode : Variable Channel(s) : 2 channels / 1 channel / 1 channel Channel positions : Front: L R / Front: C / Front: C Sampling rate : 44.1 kHz / 44.1 kHz / 22.05 kHz Frame rate : 21.533 FPS (1024 spf) Compression mode : Lossy Stream size : 0.00 Byte 128k General Complete name : http://127.0.0.1/stream/?sid=6 Format : ADTS Format/Info : Audio Data Transport Stream Overall bit rate mode : Variable Audio Format : AAC Format/Info : Advanced Audio Codec Format version : Version 4 Format profile : HE-AACv2 / HE-AAC / LC Bit rate mode : Variable Channel(s) : 2 channels / 1 channel / 1 channel Channel positions : Front: L R / Front: C / Front: C Sampling rate : 44.1 kHz / 44.1 kHz / 22.05 kHz Frame rate : 21.533 FPS (1024 spf) Compression mode : Lossy Stream size : 0.00 Byte 64k General Complete name : http://127.0.0.1/stream/?sid=7 Format : ADTS Format/Info : Audio Data Transport Stream Overall bit rate mode : Variable Audio Format : AAC Format/Info : Advanced Audio Codec Format version : Version 4 Format profile : HE-AACv2 / HE-AAC / LC Bit rate mode : Variable Channel(s) : 2 channels / 1 channel / 1 channel Channel positions : Front: L R / Front: C / Front: C Sampling rate : 44.1 kHz / 44.1 kHz / 22.05 kHz Frame rate : 21.533 FPS (1024 spf) Compression mode : Lossy Stream size : 0.00 Byte 24k General Complete name : http://127.0.0.1/stream/?sid=8 Format : ADTS Format/Info : Audio Data Transport Stream Overall bit rate mode : Variable Audio Format : AAC Format/Info : Advanced Audio Codec Format version : Version 4 Format profile : HE-AACv2 / HE-AAC / LC Bit rate mode : Variable Channel(s) : 2 channels / 1 channel / 1 channel Channel positions : Front: L R / Front: C / Front: C Sampling rate : 44.1 kHz / 44.1 kHz / 22.05 kHz Frame rate : 21.533 FPS (1024 spf) Compression mode : Lossy Stream size : 0.00 Byte Looks like the channels are procreating and is reporting as variable bitrate when the default for fdkaac is cbr. From their docs.. • AACENC_BITRATEMODE Bitrate mode. Configuration can be different kind of bitrate configurations- : 0: Constant bitrate, use bitrate according to AACENC_BITRATE. (default) Within none LD/ELD ::AUDIO_OBJECT_TYPE, the CBR mode makes use of full allowed bitreservoir. In contrast, at Low-Delay ::AUDIO_OBJECT_TYPE the bitreservoir is kept very small. 8: LD/ELD full bitreservoir for packet based transmission. $ liquidsoap --version Liquidsoap 1.3.1 (git://github.com/savonet/liquidsoap.git@cbfcd6004d7dba7211cd1d33a38fe192e1da9219:20170702:171027) This is all very odd so if anyone can shed some light that would be awesome... Cheers, -alex
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