1 files changed, 61 insertions, 0 deletions

diff --git a/shared/extra-utils/miscs/generate.ts b/shared/extra-utils/miscs/generate.ts
new file mode 100644
index 000000000..8d6435481
--- /dev/null
+++ b/shared/extra-utils/miscs/generate.ts
@@ -0,0 +1,61 @@
+import * as ffmpeg from 'fluent-ffmpeg'
+import { ensureDir, pathExists } from 'fs-extra'
+import { dirname } from 'path'
+import { buildAbsoluteFixturePath } from './tests'
+
+async function generateHighBitrateVideo () {
+  const tempFixturePath = buildAbsoluteFixturePath('video_high_bitrate_1080p.mp4', true)
+
+  await ensureDir(dirname(tempFixturePath))
+
+  const exists = await pathExists(tempFixturePath)
+  if (!exists) {
+    console.log('Generating high bitrate video.')
+
+    // Generate a random, high bitrate video on the fly, so we don't have to include
+    // a large file in the repo. The video needs to have a certain minimum length so
+    // that FFmpeg properly applies bitrate limits.
+    // https://stackoverflow.com/a/15795112
+    return new Promise<string>((res, rej) => {
+      ffmpeg()
+        .outputOptions([ '-f rawvideo', '-video_size 1920x1080', '-i /dev/urandom' ])
+        .outputOptions([ '-ac 2', '-f s16le', '-i /dev/urandom', '-t 10' ])
+        .outputOptions([ '-maxrate 10M', '-bufsize 10M' ])
+        .output(tempFixturePath)
+        .on('error', rej)
+        .on('end', () => res(tempFixturePath))
+        .run()
+    })
+  }
+
+  return tempFixturePath
+}
+
+async function generateVideoWithFramerate (fps = 60) {
+  const tempFixturePath = buildAbsoluteFixturePath(`video_${fps}fps.mp4`, true)
+
+  await ensureDir(dirname(tempFixturePath))
+
+  const exists = await pathExists(tempFixturePath)
+  if (!exists) {
+    console.log('Generating video with framerate %d.', fps)
+
+    return new Promise<string>((res, rej) => {
+      ffmpeg()
+        .outputOptions([ '-f rawvideo', '-video_size 1280x720', '-i /dev/urandom' ])
+        .outputOptions([ '-ac 2', '-f s16le', '-i /dev/urandom', '-t 10' ])
+        .outputOptions([ `-r ${fps}` ])
+        .output(tempFixturePath)
+        .on('error', rej)
+        .on('end', () => res(tempFixturePath))
+        .run()
+    })
+  }
+
+  return tempFixturePath
+}
+
+export {
+  generateHighBitrateVideo,
+  generateVideoWithFramerate
+}