Ultra Low Bitrates (REALLY!) - Hydrogenaudio Forums

Ultra Low Bitrates (REALLY!), 22khz Mono at 16kbps

Freya View Member Profile	Mar 15 2012, 10:55 Post #1
Group: Members Posts: 7 Joined: 15-March 12 Member No.: 97816	I'm encoding at around 16kbps/24kbps in Mono at 22khz. I'm trying to achieve something like FM radio quality. Sometimes I get close... I've tried lame VBR with maxbitrate and more recently have tried ABR but I'm not sure the VBR wasn't better? Does anyone have any tips on how I can improve my encodes in Lame? Should I add a highpass filter? What do others think of ABR vs VBR? I know ABR is recommended for low bitrates... I know this is really far away from the usual Lame stuff but I hope people might be able to help a bit anyway! love Freya

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Remedial Sound View Member Profile	Mar 15 2012, 16:01 Post #2
Group: Members Posts: 492 Joined: 5-January 06 From: Dublin Member No.: 26898	Have you tried "--abr 16 -mm." with the latest version of lame? It does indeed downsample to 16 khz. As onkl noted HE-AAC is really better suited for what you're trying to achieve, as it can make use of efficiency schemes (SBR & PS) that mp3 cannot.

IgorC View Member Profile	Mar 15 2012, 16:18 Post #3
Group: Members Posts: 1315 Joined: 3-January 05 From: Argentina, Bs As Member No.: 18803	QUOTE (Remedial Sound @ Mar 15 2012, 12:01) As onkl noted HE-AAC is really better suited for what you're trying to achieve, as it can make use of efficiency schemes (SBR & PS) that mp3 cannot. he-aac is a general audio format, hence more suitable for music. AMR/AMR-WB(+), G.7xx (I would say the last G.718SWB or G.719), Opus (speech mode:SILK) will be better for speech content as they are speech codecs. Probably it's worth to read http://research.nokia.com/files/FullMOSTes...ICASSP-2010.pdf http://research.nokia.com/files/public/%5B..._Opus_Codec.pdf This post has been edited by IgorC: Mar 15 2012, 16:40

Posts in this topic

Freya Ultra Low Bitrates (REALLY!) Mar 15 2012, 10:55

Fedot L QUOTE (Freya @ Mar 15 2012, 10:55) I... Mar 15 2012, 11:36

Freya QUOTE (Fedot L @ Mar 15 2012, 10:36) QUOT... Mar 15 2012, 11:52

Porcus For really low bitrates, you might want to check o... Mar 15 2012, 12:07

KMD If you just want to reduce the quality dont use an... Mar 15 2012, 12:30

Freya QUOTE (KMD @ Mar 15 2012, 11:30) If you j... Mar 15 2012, 12:47

forart.eu You have to consider Stereo Tool too for mono down... Mar 15 2012, 14:18

Freya QUOTE (forart.eu @ Mar 15 2012, 13:18) Yo... Mar 15 2012, 15:47

onkl If it doesn't need to be MP3, you should give ... Mar 15 2012, 15:16

DonP QUOTE (Freya @ Mar 15 2012, 05:55) I... Mar 15 2012, 15:36

Freya QUOTE (DonP @ Mar 15 2012, 14:36) QUOTE (... Mar 15 2012, 16:00

DonP QUOTE (Freya @ Mar 15 2012, 11:00) [ I... Mar 15 2012, 16:07

LithosZA QUOTE In fact it also needs to be linux and gstrea... Mar 15 2012, 15:43

LithosZA A few speech codecs that you could try: speex amrn... Mar 15 2012, 16:01

Remedial Sound Have you tried "--abr 16 -mm." with the ... Mar 15 2012, 16:01

IgorC QUOTE (Remedial Sound @ Mar 15 2012, 12:0... Mar 15 2012, 16:18

AndyH-ha I've done many audiobooks with this. It isn... Mar 15 2012, 20:54

birdie I'd also suggest HE-AAC or even Skype's SI... Mar 15 2012, 23:26

NullC QUOTE (birdie @ Mar 15 2012, 15:26) I... Mar 16 2012, 04:04

Fedot L QUOTE (Freya @ Mar 15 2012, 11:52) QUOTE ... Mar 16 2012, 14:28

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