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11th February 2019, 01:30 | #1 | Link | |
Herr
Join Date: Apr 2009
Location: North Europe
Posts: 556
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Speech-encoding at low bitrate with AAC?
I'm trying to find out what type of setting I should use to encode audio (speech mostly) at ~64kbps with Apple AAC-codec.
Is Apple CVBR (Constrained VBR), with HE-AAC enabled, better to use when encoding low bitrate, than using normal Apple VBR (also called TVBR, I think. LC-AAC)? This ABX-test uses Apple CVBR (with HE-AAC enabled) and not normal Apple VBR (also called TVBR, I think) when comparing codecs at low bitrate, "Public Multiformat Listening Test @ ~64 kbps (March 2011)", http://listening-tests.hydrogenaud.i...@%2064kbps.htm At 96kbps bitrate, IgorC wrote this though: Quote:
EDIT: Thanks for the answer tebasuna51 & SeeMoreDigital! Last edited by Forteen88; 12th February 2019 at 11:43. Reason: thanking |
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11th February 2019, 10:22 | #2 | Link |
Moderator
Join Date: Feb 2005
Location: Spain
Posts: 6,890
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The difference between LC-AAC (TVBR allowed) and HE-AAC (TVBR not available) is the use of SBR (Spectral Band Replication) for high frequencies in HE.
LC-AAC is better than HE-AAC with bitrates over 96 Kb/s, HE-AAC is better with bitrates below 96 Kb/s. If you want ~64kbps you must use HE-AAC CVBR.
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11th February 2019, 17:35 | #3 | Link |
Life's clearer in 4K UHD
Join Date: Jun 2003
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HE-AAC v2 (SBR with Parametric stereo)?!
See here for more info: https://forum.doom9.org/showthread.p...14#post1789614
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Last edited by SeeMoreDigital; 11th February 2019 at 23:15. |
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