Add util and rewrite examples (WIP)

apps/examples/node/concatDemuxer.js

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+const fs = require('fs');
+const { createFFmpeg, fetchFile } = require('../../src');
+
+const ffmpeg = createFFmpeg({ log: true });
+
+(async () => {
+  await ffmpeg.load();
+  ffmpeg.FS('writeFile', 'flame.avi', await fetchFile('../assets/flame.avi'));
+  ffmpeg.FS('writeFile', 'concat_list.txt', 'file flame.avi\nfile flame.avi');
+  await ffmpeg.run('-f', 'concat', '-safe', '0', '-i', 'concat_list.txt', 'flame.mp4');
+  await fs.promises.writeFile('flame.mp4', ffmpeg.FS('readFile', 'flame.mp4'));
+  process.exit(0);
+})();

apps/examples/node/hstack.js

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+const fs = require('fs');
+const { createFFmpeg, fetchFile } = require('../../src');
+
+const ffmpeg = createFFmpeg({ log: true });
+
+(async () => {
+  await ffmpeg.load();
+  ffmpeg.FS('writeFile', 'flame.avi', await fetchFile('../assets/flame.avi'));
+  await ffmpeg.run('-i', 'flame.avi', '-i', 'flame.avi', '-filter_complex', 'hstack', 'flame.mp4');
+  await fs.promises.writeFile('flame.mp4', ffmpeg.FS('readFile', 'flame.mp4'));
+  process.exit(0);
+})();

apps/examples/node/image2video.js

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+const fs = require('fs');
+const { createFFmpeg, fetchFile } = require('../../src');
+
+const ffmpeg = createFFmpeg({ log: true });
+
+(async () => {
+  await ffmpeg.load();
+  ffmpeg.FS('writeFile', 'audio.ogg', await fetchFile('../assets/triangle/audio.ogg'));
+  for (let i = 0; i < 60; i += 1) {
+    const num = `00${i}`.slice(-3);
+    ffmpeg.FS('writeFile', `tmp.${num}.png`, await fetchFile(`../assets/triangle/tmp.${num}.png`));
+  }
+  console.log(ffmpeg.FS('readdir', '/'));
+  await ffmpeg.run('-framerate', '30', '-pattern_type', 'glob', '-i', '*.png', '-i', 'audio.ogg', '-c:a', 'copy', '-shortest', '-c:v', 'libx264', '-pix_fmt', 'yuv420p', 'out.mp4');
+  await ffmpeg.FS('unlink', 'audio.ogg');
+  for (let i = 0; i < 60; i += 1) {
+    const num = `00${i}`.slice(-3);
+    await ffmpeg.FS('unlink', `tmp.${num}.png`);
+  }
+  await fs.promises.writeFile('out.mp4', ffmpeg.FS('readFile', 'out.mp4'));
+  process.exit(0);
+})();

apps/examples/node/multiple-output.js

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+const fs = require('fs');
+const { createFFmpeg, fetchFile } = require('../../src');
+
+const ffmpeg = createFFmpeg({ log: true });
+
+(async () => {
+  await ffmpeg.load();
+  ffmpeg.FS('writeFile', 'flame.avi', await fetchFile('../assets/flame.avi'));
+  await ffmpeg.run('-i', 'flame.avi', '-map', '0:v', '-r', '25', 'out_%06d.bmp');
+  ffmpeg.FS('readdir', '/').filter((p) => p.endsWith('.bmp')).forEach(async (p) => {
+    fs.writeFileSync(p, ffmpeg.FS('readFile', p));
+  });
+  process.exit(0);
+})();

apps/examples/node/transcode.js

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+const fs = require('fs');
+const { createFFmpeg, fetchFile } = require('../../src');
+
+const ffmpeg = createFFmpeg({
+  log: true,
+});
+
+(async () => {
+  await ffmpeg.load();
+  ffmpeg.FS('writeFile', 'flame.avi', await fetchFile('../assets/flame.avi'));
+  await ffmpeg.run('-i', 'flame.avi', 'flame.mp4');
+  await fs.promises.writeFile('flame.mp4', ffmpeg.FS('readFile', 'flame.mp4'));
+  process.exit(0);
+})();

apps/examples/node/trim.js

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+const fs = require('fs');
+const { createFFmpeg, fetchFile } = require('../../src');
+
+const ffmpeg = createFFmpeg({ log: true });
+
+(async () => {
+  await ffmpeg.load();
+  ffmpeg.FS('writeFile', 'flame.avi', await fetchFile('../assets/flame.avi'));
+  await ffmpeg.run('-i', 'flame.avi', '-ss', '0', '-to', '1', 'flame_trim.avi');
+  await fs.promises.writeFile('flame_trim.avi', ffmpeg.FS('readFile', 'flame_trim.avi'));
+  process.exit(0);
+})();