Changes between Version 67 and Version 68 of Encode/AAC

Timestamp:

Jan 23, 2025, 12:09:39 AM (18 months ago)

Author:

Kentzo

Comment:

-global_quality:a does not set the AV_CODEC_FLAG_QSCALE flag therefore the encoder mode remains CBR and ignores this value. -q:a sets this flag which causes FFmpeg to change mode to VBR.

Encode/AAC

@@ -146 +146 @@
 When a build is configured with --enable-audiotoolbox, Apple's audioToolbox.framework (normally available only on macOS) will provide a series of codecs suffixed `_at`. Apple's encoder [[https://wiki.hydrogenaud.io/index.php?title=Apple_AAC|is even better than FDK-AAC according to HydrogenAudio]]. You may have come across this implementation on other platforms as "QAAC" or "audioToolboxWrapper", but licensing issues for these modifications is too much for FFmpeg to deal with.
 
-Bitrate control is done by global flags. `-global_quality:a` can range from 0~14 for VBR and `-b:a` by default gives CBR. `-aac_at_mode` can be used to instead cause `-b:a` to provide AVR and CVBR. All profiles for `libfdk_aac`'s `-profile:a` option, including both versions of HE-AAC, are available.
+Bitrate control is done by global flags. `-q:a` can range from 0~14 for VBR and `-b:a` by default gives CBR. `-aac_at_mode` can be used to instead cause `-b:a` to provide AVR and CVBR. All profiles for `libfdk_aac`'s `-profile:a` option, including both versions of HE-AAC, are available.
 
 {{{#!comment