ffmpeg : ffmpeg error :Output format xxx is not available

[Osub]

Version information

• fluent-ffmpeg version: "fluent-ffmpeg": "^2.1.2",
• ffmpeg version:

ffmpeg version 7.0 Copyright (c) 2000-2024 the FFmpeg developers
built with Apple clang version 15.0.0 (clang-1500.1.0.2.5)
configuration: --prefix=/opt/homebrew/Cellar/ffmpeg/7.0 --enable-shared --enable-pthreads --enable-version3 --cc=clang --host-cflags= --host-ldflags='-Wl,-ld_classic' --enable-ffplay --enable-gnutls --enable-gpl --enable-libaom --enable-libaribb24 --enable-libbluray --enable-libdav1d --enable-libharfbuzz --enable-libjxl --enable-libmp3lame --enable-libopus --enable-librav1e --enable-librist --enable-librubberband --enable-libsnappy --enable-libsrt --enable-libssh --enable-libsvtav1 --enable-libtesseract --enable-libtheora --enable-libvidstab --enable-libvmaf --enable-libvorbis --enable-libvpx --enable-libwebp --enable-libx264 --enable-libx265 --enable-libxml2 --enable-libxvid --enable-lzma --enable-libfontconfig --enable-libfreetype --enable-frei0r --enable-libass --enable-libopencore-amrnb --enable-libopencore-amrwb --enable-libopenjpeg --enable-libopenvino --enable-libspeex --enable-libsoxr --enable-libzmq --enable-libzimg --disable-libjack --disable-indev=jack --enable-videotoolbox --enable-audiotoolbox --enable-neon
libavutil 59. 8.100 / 59. 8.100
libavcodec 61. 3.100 / 61. 3.100
libavformat 61. 1.100 / 61. 1.100
libavdevice 61. 1.100 / 61. 1.100
libavfilter 10. 1.100 / 10. 1.100
libswscale 8. 1.100 / 8. 1.100
libswresample 5. 1.100 / 5. 1.100
libpostproc 58. 1.100 / 58. 1.100

• OS: MACOS M1

Code to reproduce

const ffmpeg = require('fluent-ffmpeg');
const { Transform } = require('stream');
let dest = new Transform({
   transform: (chunk, enc, next) => {
      console.log('chunk coming',chunk.length);
      next(null, chunk);
   }
}).on('data', (data) => {});
let livestream_endpoint = 'https://svipsvip.ffzy-online5.com/20240516/27330_9f5869dd/2000k/hls/mixed.m3u8';     //sample m3u8 stream
let command = ffmpeg(livestream_endpoint)
.on('start', () => {
   console.log("ffmpeg : processing Started");
})
.on('progress', (progress) => {
   console.log('ffmpeg : Processing: ' + progress.targetSize + ' KB converted');
})
.on('end', () => {
   console.log('ffmpeg : Processing finished !');
})
.on('error', (err) => {
   console.log('ffmpeg : ffmpeg error :' + err.message);
})
.noVideo() 
.audioCodec('flav') 
.format('flav') 
.output(dest)
command.run();

(note: if the problem only happens with some inputs, include a link to such an input file)

Expected results

Observed results

ffmpeg : ffmpeg error :Output format flav is not available

Checklist

wav / mp3/aac same error

[totallytavi]

@njoyard Old issue