Ok, so Im an IT guy and kind of a noob on the dev side of the fence. But I've been able to create this ffmpeg wasm page that takes a canvas and converts it to webm / and .mp4 -- what i WANT to do is take the resulting .mp4 file and upload it to the server where the page/js are being served from. is this possible? I will include my source code which is fairly simple and straight forward, I just don't know how to manipulate the resulting mp4 file that ffmpeg spits out (i realize it is happening client side) to be able to push it up to the server (maybe with aupload.php type situation?) the solution can be html/java/php whatever, so long as it takes the mp4 output and gets it onto the server. I'd VERY MUCH appreciate a hand here.
Going to try my best to properly insert the html and js. please bear with me if i've done something wrong, i've never had to -ask- a question on here, usually just look up existing answers.
const { createFFmpeg } = FFmpeg;
const ffmpeg = createFFmpeg({
log: true
});
const transcode = async (webcamData) => {
const message = document.getElementById('message');
const name = 'record.webm';
await ffmpeg.load();
message.innerHTML = 'Start transcoding';
await ffmpeg.write(name, webcamData);
await ffmpeg.transcode(name, 'output.mp4');
message.innerHTML = 'Complete transcoding';
const data = ffmpeg.read('output.mp4');
const video = document.getElementById('output-video');
video.src = URL.createObjectURL(new Blob([data.buffer], { type: 'video/mp4' }));
dl.href = video.src;
dl.innerHTML = "download mp4"
}
fn().then(async ({url, blob})=>{
transcode(new Uint8Array(await (blob).arrayBuffer()));
})
function fn() {
var recordedChunks = [];
var time = 0;
var canvas = document.getElementById("canvas");
return new Promise(function (res, rej) {
var stream = canvas.captureStream(60);
mediaRecorder = new MediaRecorder(stream, {
mimeType: "video/webm; codecs=vp9"
});
mediaRecorder.start(time);
mediaRecorder.ondataavailable = function (e) {
recordedChunks.push(event.data);
// for demo, removed stop() call to capture more than one frame
}
mediaRecorder.onstop = function (event) {
var blob = new Blob(recordedChunks, {
"type": "video/webm"
});
var url = URL.createObjectURL(blob);
res({url, blob}); // resolve both blob and url in an object
myVideo.src = url;
// removed data url conversion for brevity
}
// for demo, draw random lines and then stop recording
var i = 0,
tid = setInterval(()=>{
if(i++ > 20) { // draw 20 lines
clearInterval(tid);
mediaRecorder.stop();
}
let canvas = document.querySelector("canvas");
let cx = canvas.getContext("2d");
cx.beginPath();
cx.strokeStyle = 'green';
cx.moveTo(Math.random()*100, Math.random()*100);
cx.lineTo(Math.random()*100, Math.random()*100);
cx.stroke();
},200)
});
}<html>
<head>
<script src="https://unpkg.com/@ffmpeg/ffmpeg@0.8.1/dist/ffmpeg.min.js" defer></script>
<script src="canvas2mp4.js" defer></script>
</head>
<body>
here is a canvas<br>
<canvas id="canvas" style="height:100px;width:100px"></canvas><br>
here is a recorded video of the canvas in webM format<br>
<video id="myVideo" controls="controls"></video><br>
here is a transcoded mp4 from the webm above CLIENT SIDE using ffmpeg<br>
<video id="output-video" controls="controls"></video><br>
<a id="dl" href="" download="download.mp4"></a>
<div id="message"></div><br><br>
</body>
</html>