Changes between Version 62 and Version 63 of Encode/AAC

Timestamp:

Apr 21, 2023, 2:13:06 PM (3 years ago)

Author:

Mingye Wang

Comment:

Oh right, quality bit needs third encoder. aac_at (when it was qaac) seems to be talked about as "the best" beyond fdk a lot, but who knows. just throw a greater/equal sign.

Encode/AAC

@@ -144 +144 @@
 ----
 = audiotoolbox Encoder =
-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 is quite good in listening tests and has HE-AAC support, so that the exact same list of `-profile:a` flags from FDK work<!-- see audiotoolboxenc.c, ffat_get_format_id -->. 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.
+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 is quite good in listening tests and has HE-AAC support, so that the exact same list of `-profile:a` flags from FDK work. 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.
+{{{#!comment
+see audiotoolboxenc.c, ffat_get_format_id()
+}}}
 
 ----
@@ -184 +187 @@
 == Which encoder provides the best quality? ==
 
-For AAC-LC: `libfdk_aac` > Native FFmpeg AAC encoder (`aac`).
-
-For HE-AAC you have one choice: `libfdk_aac`.
+For AAC-LC: `aac_at` ≥ `libfdk_aac` > Native FFmpeg AAC encoder (`aac`).
+
+For HE-AAC it's unclear whether `aac_at` or `libfdk_aac` is better.
 
 == Should I use AAC-LC or HE-AAC? ==