| 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 is quite good in listening tests and has HE-AAC support, so that the same `-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. |
