add script printing command to generate a resolution for a given file

scripts/print-transcode-command.ts

@@ -0,0 +1,52 @@
+import { registerTSPaths } from '../server/helpers/register-ts-paths'
+registerTSPaths()
+
+import * as program from 'commander'
+import * as ffmpeg from 'fluent-ffmpeg'
+import { availableEncoders } from '@server/lib/video-transcoding-profiles'
+import { buildx264VODCommand, runCommand, TranscodeOptions } from '@server/helpers/ffmpeg-utils'
+import { exit } from 'process'
+
+program
+  .arguments('<path>')
+  .requiredOption('-r, --resolution [resolution]', 'video resolution')
+  .action((path, cmd) => {
+    if (cmd.resolution !== undefined && Number.isNaN(+cmd.resolution)) {
+      console.error('The resolution must be an integer (example: 1080).')
+      process.exit(-1)
+    }
+
+    run(path, cmd)
+      .then(() => process.exit(0))
+      .catch(err => {
+        console.error(err)
+        process.exit(-1)
+      })
+  })
+  .parse(process.argv)
+
+async function run (path: string, cmd: any) {
+  const options = {
+    type: 'video' as 'video',
+    inputPath: path,
+    outputPath: '/dev/null',
+
+    availableEncoders,
+    profile: 'default',
+
+    resolution: +cmd.resolution,
+    isPortraitMode: false
+  } as TranscodeOptions
+
+  let command = ffmpeg(options.inputPath)
+               .output(options.outputPath)
+
+  command = await buildx264VODCommand(command, options)
+
+  command.on('start', (cmdline) => {
+    console.log(cmdline)
+    exit()
+  })
+
+  await runCommand(command)
+}