not getting transcribed text

i am sending audio blob using mediarecorder to django websocket using this
navigator.mediaDevices.getUserMedia({ audio: true }).then((stream) => {
const mediaRecorder = new MediaRecorder(stream, { mimeType: 'audio/webm' });
const socket = new WebSocket('ws://localhost:8000/ws/transcribe/');

mediaRecorder.addEventListener('dataavailable', async (event) => {
if (event.data.size > 0) {
const audioBlob = await event.data.arrayBuffer();
socket.send(audioBlob);
console.log(audioBlob);
}
}); but i am not able to convert audioBlob to proper vosk supported format tried everything but not able to convert it. Earlier i tried by saving audio and then converting it that works fine but now i am trying to do real time transcription that is not working