109 lines
3.1 KiB
JavaScript
109 lines
3.1 KiB
JavaScript
const ffmpeg = new FFmpegWASM.FFmpeg();
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const notifier = new Notifier();
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async function compress() {
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document.getElementById("uploaded-video").pause();
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showSection("loading");
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const filesize = document.getElementById("filesize").value;
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const filesizeUnit = document.getElementById("filesize-unit").value;
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const file = document.getElementById("file-input").files[0];
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const videoLength = document.getElementById("uploaded-video").duration;
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let targetFilesize; // Stored in kBit
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switch (filesizeUnit) {
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case "K": targetFilesize = filesize * 8; break;
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case "M": targetFilesize = filesize * 8000; break;
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}
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ffmpeg.on("log", event => {
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console.log("[ffmpeg]", event.type, event.message);
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});
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updateProgress(0);
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ffmpeg.on("progress", event => {
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updateProgress(event.progress);
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});
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await ffmpeg.load({ coreURL: "/assets/scripts/core/package/dist/umd/ffmpeg-core.js" });
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await ffmpeg.writeFile(file.name, await readFromBlob(file));
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// Calculate target bitrate to create a video file with desired file size (https://trac.ffmpeg.org/wiki/Encode/H.264#twopass)
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let bitrate = targetFilesize / videoLength;
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bitrate -= 128; // Subtract audio bitrate
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bitrate -= (bitrate / 100) * 5; // Subtract 5% to compensate for overhead
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bitrate = Math.floor(bitrate);
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if (bitrate <= 0) {
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showSection("file-picker");
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alert("Selected file size is too low for this video");
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return;
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}
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console.debug("Target bitrate:", bitrate, "Video length:", videoLength);
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await ffmpeg.exec(["-i", file.name, "-preset", "ultrafast", "-c:v", "libx264", "-b:v", bitrate + "k", "-c:a", "copy", "-b:a", "128k", "compressed.mp4"]);
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const video = await ffmpeg.readFile("compressed.mp4");
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notifier.notifyFinished();
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location.href = URL.createObjectURL(new Blob([video.buffer], { type: "video/mp4" }));
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}
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function cancel() {
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ffmpeg.terminate();
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showSection("file-picker");
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}
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function updateProgress(progress) {
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const percent = (progress * 100).toFixed(1) + "%";
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document.getElementById("progress-percentage").innerText = percent;
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document.getElementById("progress-indicator").style.clipPath = `rect(0 ${percent} 100% 0)`;
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}
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function openFileSelector() {
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document.getElementById("file-input").click();
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}
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function selectFile() {
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setTimeout(() => {
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const file = document.getElementById("file-input").files[0];
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document.getElementById("uploaded-video").src = URL.createObjectURL(file);
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document.getElementById("uploaded-video").load();
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hideElements("#file-drop-area", "#file-input-spacing");
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showElements("#uploaded-video", "#change-file");
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}, 200);
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}
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// https://github.com/ffmpegwasm/ffmpeg.wasm/blob/main/packages/util/src/index.ts
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function readFromBlob(blob) {
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return new Promise((resolve, reject) => {
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const fileReader = new FileReader();
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fileReader.onload = () => {
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const { result } = fileReader;
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if (result instanceof ArrayBuffer) {
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resolve(new Uint8Array(result));
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} else {
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resolve(new Uint8Array());
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}
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};
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fileReader.onerror = (event) => {
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reject(
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Error(
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`File could not be read! Code=${event?.target?.error?.code || -1}`
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)
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);
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};
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fileReader.readAsArrayBuffer(blob);
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});
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}
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