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When I use Audio Toolbox APIs to decode AAC audio, I am getting kAudioConverterErr_FormatNotSupported(1718449215) error. This works fine in BigSur(11.5.2) and previous versions. prompt> ./ffmpeg -c:a aac_at -i audio24b_he_aac.aac -f s16le -acodec pcm_s16le output.pcm -v trace ffmpeg version N-104401-gcd38fbf4f7 Copyright (c) 2000-2021 the FFmpeg developers  built with Apple clang version 13.0.0 (clang-1300.0.29.3)  configuration: --disable-x86asm  libavutil   57. 7.100 / 57. 7.100  libavcodec   59. 12.100 / 59. 12.100  libavformat  59. 6.100 / 59. 6.100  libavdevice  59. 0.101 / 59. 0.101  libavfilter   8. 15.100 / 8. 15.100  libswscale   6. 1.100 / 6. 1.100  libswresample  4. 0.100 / 4. 0.100 Splitting the commandline. Reading option '-c:a' ... matched as option 'c' (codec name) with argument 'aac_at'. Reading option '-i' ... matched as input url with argument 'audio24b_he_aac.aac'. Reading option '-f' ... matched as option 'f' (force format) with argument 's16le'. Reading option '-acodec' ... matched as option 'acodec' (force audio codec ('copy' to copy stream)) with argument 'pcm_s16le'. Reading option 'output.pcm' ... matched as output url. Reading option '-v' ... matched as option 'v' (set logging level) with argument 'trace'. Finished splitting the commandline. Parsing a group of options: global . Applying option v (set logging level) with argument trace. Successfully parsed a group of options. Parsing a group of options: input url audio24b_he_aac.aac. Applying option c:a (codec name) with argument aac_at. Successfully parsed a group of options. Opening an input file: audio24b_he_aac.aac. [NULL @ 0x7f8cf4004d40] Opening 'audio24b_he_aac.aac' for reading [file @ 0x7f8cf4005180] Setting default whitelist 'file,crypto,data' Probing aac score:51 size:2048 [aac @ 0x7f8cf4004d40] Format aac probed with size=2048 and score=51 [aac @ 0x7f8cf4004d40] Before avformat_find_stream_info() pos: 0 bytes read:65696 seeks:4 nb_streams:1 [aac_at @ 0x7f8cf40057c0] AudioToolbox init error: 1718449215 [aac @ 0x7f8cf4004d40] All info found [aac @ 0x7f8cf4004d40] Estimating duration from bitrate, this may be inaccurate Following lines of code is failing. status = AudioConverterNew(&in_format, &out_format, &at->converter); if (status != 0) { av_log(avctx, AV_LOG_ERROR, "AudioToolbox init error: %i\n", (int)status); return AVERROR_UNKNOWN; } Is there any change with respect to these APIs in Monterey. I could not find any thing in the documentation or release notes.