How to cut audiofile from input in browser with js, lamejs?

I have input in my Vue component where i upload audiofile via @change, next i need to cut it, for example i have 30 seconds audio and i need to receive audio from 5 to 15 second.
I have installed lamejs package to do that.

But after all my operations with audio i receive cutted audio but without any sound, so i dont know where is the reason of that. Need help!

method which upload file

async onUploadFile(event) {
        const fileData = event.target.files[0];
        this.file = fileData;
        await this.decodeFile(fileData);
    },

method which decodes file to audioBuffer

async onUploadFile(event) {
        const fileData = event.target.files[0];
        this.file = fileData;
        await this.decodeFile(fileData);
    },

method which cut audio and encode it to mp3 and then receive blob url

async audioBufferSlice(buffer, begin, end) {
        const audioContext = new AudioContext();
        const channels = buffer.numberOfChannels;
        const rate = buffer.sampleRate;
        const duration = buffer.duration;

        const startOffset = rate * begin;
        const endOffset = rate * end;
        const frameCount = endOffset - startOffset;

        const audioLength = endOffset - startOffset;

        let trimmedAudio = audioContext.createBuffer(
            buffer.numberOfChannels,
            audioLength,
            rate
        );

        for(var i = 0; i < buffer.numberOfChannels; i++){
            trimmedAudio.copyToChannel(buffer.getChannelData(i).slice(begin, end), i);
        }

        var audioData = this.serializeAudioBuffer(trimmedAudio);

        let mp3Data = [];
        const sampleBlockSize = 1152;

        let mp3encoder = new lamejs.Mp3Encoder(2, audioData.sampleRate, 128);

        var left = new Int8Array(audioData.channels[0].length);
        var right = new Int8Array(audioData.channels[1].length);

        for (var i = 0; i < audioData.channels[0].length; i += sampleBlockSize) {
            var leftChunk = left.subarray(i, i + sampleBlockSize);
            var rightChunk = right.subarray(i, i + sampleBlockSize);
            var mp3buf = await mp3encoder.encodeBuffer(leftChunk, rightChunk);
            if (mp3buf.length > 0) {
                mp3Data.push(mp3buf);
            }
        }

        let buf = await mp3encoder.flush();

        if (buf.length > 0) {
            mp3Data.push(buf);
        }

        var blob = new Blob(mp3Data, {type: 'audio/mp3'});
        var url = window.URL.createObjectURL(blob);
        console.log('MP3 URl: ', url);
    },

What did I do wrong that I receive cut audio but without any sound?
I look at that repository as example https://github.com/Vinit-Dantkale/AudioFy