Deno.js FFMPEG Library Tutorial to Build Video Converter Using TypeScript

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Deno.js FFMPEG Library Tutorial to Build Video Converter Using TypeScript

An easy to use ffmpeg module for Deno.

Installation

This is a Deno module and can be imported directly from the repo and from following registries.

Deno Registry

import { ffmpeg } from "https://deno.land/x/fast_forward@<version>/mod.ts";

Nest Registry

import { ffmpeg } from "https://x.nest.land/fast_forward@<version>/mod.ts";

Github

import { ffmpeg } from "https://raw.githubusercontent.com/c4spar/deno-fast-forward/<version>/mod.ts";

Usage

await ffmpeg("https://www.w3schools.com/html/mov_bbb.mp4")
  // Global encoding options (applied to all outputs).
  .audioBitrate("192k")
  .videoBitrate("1M")
  .width(480)
  .height(640)
  // Ouput 1.
  .output("output.mp4")
  .audioCodec("aac")
  .videoCodec("libx264")
  // Ouput 2.
  .output("output.webm")
  .audioCodec("libvorbis")
  .videoCodec("libvpx-vp9")
  // Start encoding.
  .encode();

console.log("All encodings done!");

Getting Started

First create an instance of FFmpeg.

const encoder = ffmpeg("https://www.w3schools.com/html/mov_bbb.mp4");
// or using the constructor
const encoder = new FFmpeg("https://www.w3schools.com/html/mov_bbb.mp4");

Then you can define global options and events which will be applied to all defined outputs.

encoder
  .audioBitrate("192k")
  .videoBitrate("1M")
  .addEventListener(
    "progress",
    (event) => console.log("Progress: %s", event.progress),
  )
  .addEventListener("error", (event) => console.log(event.error));

Examples

await ffmpeg("https://www.w3schools.com/html/mov_bbb.mp4")
  .audioBitrate("192k")
  .videoBitrate("1M")
  .width(480)
  .height(640)
  .addEventListener("start", (event) => console.log("Event: %s", event.type))
  .addEventListener("info", (event) => console.log("Event: %s", event.type))
  .addEventListener("progress", (event) => console.log("Event: %s", event.type))
  .addEventListener("end", (event) => console.log("Event: %s", event.type))
  .addEventListener("error", (error) => console.log("Event: %s", error.type))
  .output("output.mp4")
  .output("output.webm")
  .encode();

console.log("All encodings done!");

$ deno run --allow-read --allow-run https://deno.land/x/fast_forward/examples/events.ts

Process handling

const encoder = ffmpeg("https://www.w3schools.com/html/mov_bbb.mp4")
  .audioBitrate("192k")
  .videoBitrate("1M")
  .width(480)
  .height(640)
  .output("output.mp4")
  .output("output.mkv");

for await (const process: EncodingProcess of encoder) {
  process.run();
  const status: EncodingStatus = await process.status();
  process.close();
  if (!status.success) {
    throw new Error(
      `Encoding failed: ${process.encoding.output}\n${
        new TextDecoder().decode(await process.stderrOutput())
      }`,
    );
  }
  console.log("Encoding of %s done!", process.encoding.output);
}

console.log("All encodings done!");

$ deno run --allow-read --allow-run https://deno.land/x/fast_forward/examples/process-handling.ts

Event Stream

const spinner = wait({ text: "" });

const encoder = ffmpeg("https://www.w3schools.com/html/mov_bbb.mp4")
  .audioBitrate("192k")
  .videoBitrate("1M")
  .width(480)
  .height(640)
  .output("output.mp4")
  .output("output.webm");

for await (const process: EncodingProcess of encoder) {
  process.run();
  spinner.start();
  for await (const event: EncodingEvent of process) {
    switch (event.type) {
      case "start":
        spinner.text = `Loading meta data: ${event.encoding.output} ...`;
        break;
      case "info":
        spinner.text = `Start encoding: ${event.encoding.output} ...`;
        break;
      case "progress":
        spinner.text = `Encode: ${event.encoding.output} - ${event.progress}%`;
        break;
      case "end":
        spinner.stop();
        process.close();
        console.log(`<img alt="✔" src="https://s.w.org/images/core/emoji/13.1.0/svg/2714.svg" style="width: 20px;"> Encode: ${process.encoding.output} - 100%`);
        break;
      case "error":
        spinner.stop();
        process.close();
        console.log(`✘ Encode: ${process.encoding.output} - failed!`);
        throw event.error;
    }
  }
}

console.log("All encodings done!");

$ deno run --allow-read --allow-run --unstable https://deno.land/x/fast_forward/examples/event-stream.ts

Output Stream

const encoder = ffmpeg("https://www.w3schools.com/html/mov_bbb.mp4")
  .output("pipe:1")
  .format("mp4")
  .videoBitrate("933k")
  .audioBitrate("128k")
  .args(["-movflags", "frag_keyframe+empty_moov"]);

for await (const process: EncodingProcess of encoder) {
  process.run();
  if (process.stdout) {
    const outputFile: Deno.File = await Deno.open("output.mp4", {
      create: true,
      write: true,
    });
    const [status] = await Promise.all([
      process.status(),
      Deno.copy(process.stdout, outputFile),
    ]);
    console.log({ status });
  }
  process.close();
}

console.log("Encoding done!");

$ deno run --allow-read --allow-write --allow-run https://deno.land/x/fast_forward/examples/output-s

Read Also: Deno.js Tutorial to Get Module or Package Information Using moduleInfo Library in TypeScript

Final Words

Deno.js FFMPEG Library Tutorial to Build Video Converter Using TypeScriptthe article will satisfy all your doubts.