From 5e10e8d73a19ed38aeb26d7e57b96d5843e7136d Mon Sep 17 00:00:00 2001
From: Felix Ableitner <me@nutomic.com>
Date: Tue, 23 Oct 2018 02:25:09 -0500
Subject: [PATCH] Make backups of files in optimize-old-videos.ts (#1304)

---
 scripts/optimize-old-videos.ts | 42 ++++++++++++++++++++++++++++------
 1 file changed, 35 insertions(+), 7 deletions(-)

diff --git a/scripts/optimize-old-videos.ts b/scripts/optimize-old-videos.ts
index c93f82316..1bee1b0f3 100644
--- a/scripts/optimize-old-videos.ts
+++ b/scripts/optimize-old-videos.ts
@@ -1,10 +1,11 @@
 import { CONFIG, VIDEO_TRANSCODING_FPS } from '../server/initializers/constants'
-import { getVideoFileBitrate, getVideoFileFPS, getVideoFileResolution } from '../server/helpers/ffmpeg-utils'
+import { getVideoFileBitrate, getVideoFileFPS, getVideoFileResolution, getDurationFromVideoFile } from '../server/helpers/ffmpeg-utils'
 import { getMaxBitrate } from '../shared/models/videos'
 import { VideoModel } from '../server/models/video/video'
 import { optimizeVideofile } from '../server/lib/video-transcoding'
 import { initDatabaseModels } from '../server/initializers'
-import { join } from 'path'
+import { join, basename, dirname } from 'path'
+import { copy, remove, move } from 'fs-extra'
 
 run()
   .then(() => process.exit(0))
@@ -13,24 +14,51 @@ run()
     process.exit(-1)
   })
 
+let currentVideoId = null
+let currentFile = null
+
+process.on('SIGINT', async function () {
+  console.log('Cleaning up temp files')
+  await remove(`${currentFile}_backup`)
+  await remove(`${dirname(currentFile)}/${currentVideoId}-transcoded.mp4`)
+  process.exit(0)
+})
+
 async function run () {
   await initDatabaseModels(true)
 
   const localVideos = await VideoModel.listLocal()
 
   for (const video of localVideos) {
+    currentVideoId = video.id
     for (const file of video.VideoFiles) {
-      const inputPath = join(CONFIG.STORAGE.VIDEOS_DIR, video.getVideoFilename(file))
+      currentFile = join(CONFIG.STORAGE.VIDEOS_DIR, video.getVideoFilename(file))
 
       const [ videoBitrate, fps, resolution ] = await Promise.all([
-        getVideoFileBitrate(inputPath),
-        getVideoFileFPS(inputPath),
-        getVideoFileResolution(inputPath)
+        getVideoFileBitrate(currentFile),
+        getVideoFileFPS(currentFile),
+        getVideoFileResolution(currentFile)
       ])
 
-      const isMaxBitrateExceeded = videoBitrate > getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)
+      const maxBitrate = getMaxBitrate(resolution.videoFileResolution, fps, VIDEO_TRANSCODING_FPS)
+      const isMaxBitrateExceeded = videoBitrate > maxBitrate
       if (isMaxBitrateExceeded) {
+        console.log('Optimizing video file %s with bitrate %s kbps (max: %s kbps)',
+          basename(currentFile), videoBitrate / 1000, maxBitrate / 1000)
+        const backupFile = `${currentFile}_backup`
+        await copy(currentFile, backupFile)
         await optimizeVideofile(video, file)
+        const originalDuration = await getDurationFromVideoFile(backupFile)
+        const newDuration = await getDurationFromVideoFile(currentFile)
+        if (originalDuration === newDuration) {
+          console.log('Finished optimizing %s', basename(currentFile))
+          await remove(backupFile)
+        } else {
+          console.log('Failed to optimize %s, restoring original', basename(currentFile))
+          move(backupFile, currentFile, { overwrite: true })
+          await video.createTorrentAndSetInfoHash(file)
+          await file.save()
+        }
       }
     }
   }
-- 
2.25.1