如何在JavaScript中剪切錄音

Question

說我使用Recorder.js從麥克風錄製音頻。我怎樣才能修剪/裁剪/切片/剪切錄音？意思是說，我記錄了3.5秒，而我只想要前3秒。有任何想法嗎？

Answer 1

可以3秒後停止原始錄音或使用<audio>元素，HTMLMediaElement.captureStream()和MediaRecorder記錄的原始錄音的播放3秒。

const audio = new Audio(/* Blob URL or URL of recording */); 
const chunks = []; 
audio.oncanplay = e => { 
    audio.play(); 
    const stream = audio.captureStream(); 
    const recorder = new MediaRecorder(stream); 
    recorder.ondataavailable = e => { 
    if (recorder.state === "recording") { 
     recorder.stop() 
    }; 
    chunks.push(e.data) 
    } 
    recorder.onstop = e => { 
    console.log(chunks) 
    } 
    recorder.start(3000); 
}