[Flutter] Convert AAC to MP4 for use microphone

I'm looking for use the microphone on flutter but I always have a crash the APP. I need it to use the microphone and send the voice to a chat.

Please how can I do it ?

# File on the UI

final AudioRecorderService _audioRecorderService = AudioRecorderService();
bool _isRecording = false;

void _toggleRecording() async {
if (_isRecording) {
await _audioRecorderService.stopRecordingAndConvert();
addDiscussionMessage(
idDiscussion: discussionDetail['idDiscussion'],
idType: 2,
data: _audioRecorderService.filePath,
).then((_) {
setState(() {
futureCreateDiscussion =
createDiscussion(name: "", idUser: widget.varToPage);
});
});
print("object : ${_audioRecorderService.filePath}");
} else {
await _audioRecorderService.startRecording();
}
setState(() {
_isRecording = !_isRecording;
});
}
(...)
IconButton(
onPressed: _toggleRecording,
icon: Icon(_isRecording ? Icons.mic_off : Icons.mic,
color: ColorsDiolos.violetFonce),
),



# Class to save into temp directory and convert

import 'package:flutter/material.dart';
import 'packageath_provider/path_provider.dart';
import 'package:flutter_sound/flutter_sound.dart';
import 'package:video_compress/video_compress.dart';
import 'dart:io';

class AudioRecorderService {
final FlutterSoundRecorder _recorder = FlutterSoundRecorder();
bool _isRecording = false;
String? _filePath;

final ValueNotifier<String?> convertedFilePathNotifier = ValueNotifier(null);

Future<void> init() async {
await _recorder.openRecorder();
}

Future<void> startRecording() async {
if (_isRecording) return;

try {
Directory tempDir = await getTemporaryDirectory();
_filePath =
'${tempDir.path}/audio_${DateTime.now().millisecondsSinceEpoch}.aac';

await _recorder.startRecorder(
toFile: _filePath,
codec: Codec.aacADTS,
);
_isRecording = true;
print("Enregistrement commencé : $_filePath");
} catch (e) {
print("Erreur lors du démarrage de l'enregistrement : $e");
}
}

Future<void> stopRecordingAndConvert() async {
if (!_isRecording) return;

try {
await _recorder.stopRecorder();
_isRecording = false;

// Petite attente pour s'assurer que le fichier est bien créé
await Future.delayed(Duration(milliseconds: 500));

// Chemin de sortie pour le fichier MP4 dans le même répertoire temporaire
Directory tempDir = await getTemporaryDirectory();
String outputFilePath =
'${tempDir.path}/audio_${DateTime.now().millisecondsSinceEpoch}.mp4';

await convertAACtoMP4(_filePath!, outputFilePath);

// Notifie l'UI avec le chemin du fichier MP4
convertedFilePathNotifier.value = outputFilePath;
_filePath = outputFilePath;
print("Enregistrement arrêté et converti : $outputFilePath");
} catch (e) {
print("Erreur lors de l'arrêt de l'enregistrement : $e");
}
}

Future<void> convertAACtoMP4(
String inputFilePath, String outputFilePath) async {
try {
print("inputFile dans convert : $inputFilePath");

// Re-vérifiez l'existence du fichier juste avant la compression
final inputFile = File(inputFilePath);
if (!inputFile.existsSync()) {
print(
"Erreur : le fichier d'entrée n'existe pas ou le chemin est incorrect.");
return;
}

MediaInfo? mediaInfo = await VideoCompress.compressVideo(
inputFilePath,
quality: VideoQuality.DefaultQuality,
deleteOrigin: false,
includeAudio: true,
);

if (mediaInfo != null && mediaInfo.file != null) {
File(mediaInfo.file!.path).copySync(outputFilePath);
print('Conversion réussie : $outputFilePath');
} else {
print('Erreur lors de la conversion : mediaInfo est null');
}
} catch (e) {
print("Exception lors de la conversion : $e");
}
}

bool get isRecording => _isRecording;
String? get filePath => _filePath;

Future<void> dispose() async {
await _recorder.closeRecorder();
convertedFilePathNotifier.dispose();
}
}



thank you,

I tried with FFmpeg but I d'ont want to use it if possible

Output from flutter : flutter: inputFile dans convert : /Users/ogosselin/Library/Developer/CoreSimulator/Devices/5C24B81E-763F-4DBD-834A-F7CC59D1234F/data/Containers/Data/Application/833D4453-4D57-481E-BDBE-CC379B5C0E30/Library/Caches/audio_1730626770102.aac flutter: VideoCompress: You can try to subscribe to the flutter: compressProgress$ stream to know the compressing state. video_compress/SwiftVideoCompressPlugin.swift:203: Fatal error: Unexpectedly found nil while unwrapping an Optional value Lost connection to device.

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