Automatic encoder selection failed Default encoder for format mp3 (codec mp3) is probably disabled. Please choose an encoder manually.

[arex0207]

There is no mp3 encoding enabled any encoder, hope to be able to support, this application is very common

[matvuric]

Same when I try to concatenate few audios

Future<File> concatenate(
  List<String> assetPaths, {
  String output = "new.mp3",
}) async {
  final directory = await getTemporaryDirectory();
  final file = File("${directory.path}/$output");

  final cmd = <String>[];
  for (final path in assetPaths) {
    cmd.add("-i");
    cmd.add('${directory.path}/$path');
  }

  cmd.addAll([
    "-filter_complex",
    "${[
      for (var i = 0; i < assetPaths.length; i++) '[$i:a]',
    ].join()}concat=n=${assetPaths.length}:v=0:a=1",
    file.path,
  ]);

  FFmpegKitConfig.enableLogs();
  FFmpegKitConfig.enableLogCallback((value) => print(value.getMessage()));
  await FFmpegKit.executeWithArguments(cmd);
  return file;
}

Got such logs:

I/flutter ( 8299): libavutil 58. 2.100 / 58. 2.100 I/flutter ( 8299): libavcodec 60. 3.100 / 60. 3.100 I/flutter ( 8299): libavformat 60. 3.100 / 60. 3.100 I/flutter ( 8299): libavdevice 60. 1.100 / 60. 1.100 I/flutter ( 8299): libavfilter 9. 3.100 / 9. 3.100 I/flutter ( 8299): libswscale 7. 1.100 / 7. 1.100 I/flutter ( 8299): libswresample 4. 10.100 / 4. 10.100 I/flutter ( 8299): Input #0, mp3, from '/data/user/0/com.example.ps3/cache/waterfall.mp3': I/flutter ( 8299): Metadata: I/flutter ( 8299): genre : I/flutter ( 8299): Other I/flutter ( 8299): I/flutter ( 8299): comment : I/flutter ( 8299): I/flutter ( 8299): encoder : I/flutter ( 8299): Lavf58.20.100 I/flutter ( 8299): I/flutter ( 8299): Duration: I/flutter ( 8299): 00:00:10.06 I/flutter ( 8299): , start: I/flutter ( 8299): 0.011995 I/flutter ( 8299): , bitrate: I/flutter ( 8299): 128 kb/s I/flutter ( 8299): I/flutter ( 8299): Stream #0:0 I/flutter ( 8299): : Audio: mp3, 44100 Hz, stereo, fltp, 128 kb/s I/flutter ( 8299): I/flutter ( 8299): Metadata: I/flutter ( 8299): encoder : I/flutter ( 8299): Lavf I/flutter ( 8299): I/flutter ( 8299): Input #1, mp3, from '/data/user/0/com.example.ps3/cache/rain.mp3': I/flutter ( 8299): Metadata: I/flutter ( 8299): encoder : I/flutter ( 8299): Lavf58.20.100 I/flutter ( 8299): I/flutter ( 8299): Duration: I/flutter ( 8299): 00:00:10.03 I/flutter ( 8299): , start: I/flutter ( 8299): 0.025057 I/flutter ( 8299): , bitrate: I/flutter ( 8299): 64 kb/s I/flutter ( 8299): I/flutter ( 8299): Stream #1:0 I/flutter ( 8299): : Audio: mp3, 44100 Hz, mono, fltp, 64 kb/s I/flutter ( 8299): I/flutter ( 8299): [aost#0:0 @ 0x765f0b59c2c0] Automatic encoder selection failed Default encoder for format mp3 (codec mp3) is probably disabled. Please choose an encoder manually. I/flutter ( 8299): [aost#0:0 @ 0x765f0b59c2c0] Error selecting an encoder

[tanersener]

mp3 encoding is provided by lame or shine libraries. Install an ffmpeg-kit package that includes one of those two if you want to encode mp3s.