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concatDemuxer.html
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<html>
<head>
<link rel="stylesheet" href="style.css">
<script src="/assets/ffmpeg/package/dist/umd/ffmpeg.js"></script>
<script src="/assets/util/package/dist/umd/index.js"></script>
</head>
<body>
<h3>Select multiple video files to Concatenate</h3>
<video id="output-video" controls></video><br />
<input type="file" id="uploader" multiple />
<p id="message"></p>
<script>
const { fetchFile } = FFmpegUtil;
const { FFmpeg } = FFmpegWASM;
let ffmpeg = null;
const transcode = async ({ target: { files } }) => {
const message = document.getElementById("message");
if (ffmpeg === null) {
ffmpeg = new FFmpeg();
ffmpeg.on("log", ({ message }) => {
console.log(message);
})
ffmpeg.on("progress", ({ progress, time }) => {
message.innerHTML = `${time / 1000000} s`;
});
const baseURL = 'https://unpkg.com/@ffmpeg/[email protected]/dist/umd';
await ffmpeg.load({
coreURL: await toBlobURL(`${baseURL}/ffmpeg-core.js`, 'text/javascript'),
wasmURL: await toBlobURL(`${baseURL}/ffmpeg-core.wasm`, 'application/wasm'),
});
}
message.innerHTML = "Start Concating";
const inputPaths = [];
for (const file of files) {
const { name } = file;
ffmpeg.writeFile(name, await fetchFile(file));
inputPaths.push(`file ${name}`);
}
await ffmpeg.writeFile('concat_list.txt', inputPaths.join('\n'));
await ffmpeg.exec(['-f', 'concat', '-safe', '0', '-i', 'concat_list.txt', 'output.mp4']);
message.innerHTML = "Complete Concating";
const data = await ffmpeg.readFile('output.mp4');
const video = document.getElementById("output-video");
video.src = URL.createObjectURL(
new Blob([data.buffer], {
type: "video/mp4"
})
);
};
const elm = document.getElementById("uploader");
elm.addEventListener("change", transcode);
</script>
</body>
</html>