Set bitrate limits for transcoding (fixes #638) (#1135)

* Set bitrate limits for transcoding (fixes #638)

* added optimization script and test, changed stuff

* fix test, improve docs

* re-add optimize-old-videos script

* added documentation

* Don't optimize videos without valid UUID, or redundancy videos

* move getUUIDFromFilename

* fix tests?

* update torrent and file size, some more fixes/improvements

* use higher bitrate for high fps video, adjust bitrates

* add test video

* don't throw error if resolution is undefined

* generate test fixture on the fly

* use random noise video for bitrate test, add promise

* shorten test video to avoid timeout

* use existing function to optimize video

* various fixes

* increase test timeout

* limit test fixture size, add link

* test fixes

* add await

* more test fixes, add -b:v parameter

* replace ffmpeg wiki link

* fix ffmpeg params

* fix unit test

* add test fixture to .gitgnore

* add video transcoding fps model

* add missing file

1 files changed, 16 insertions, 1 deletions

diff --git a/server/helpers/utils.ts b/server/helpers/utils.ts
index 6228fec04..39afb4e7b 100644
--- a/server/helpers/utils.ts
+++ b/server/helpers/utils.ts
@@ -77,6 +77,20 @@ async function getVersion () {
   return require('../../../package.json').version
 }
 
+/**
+ * From a filename like "ede4cba5-742b-46fa-a388-9a6eb3a3aeb3.mp4", returns
+ * only the "ede4cba5-742b-46fa-a388-9a6eb3a3aeb3" part. If the filename does
+ * not contain a UUID, returns null.
+ */
+function getUUIDFromFilename (filename: string) {
+  const regex = /[0-9a-f]{8}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{4}-[0-9a-f]{12}/
+  const result = filename.match(regex)
+
+  if (!result || Array.isArray(result) === false) return null
+
+  return result[0]
+}
+
 // ---------------------------------------------------------------------------
 
 export {
@@ -86,5 +100,6 @@ export {
   getSecureTorrentName,
   getServerActor,
   getVersion,
-  generateVideoTmpPath
+  generateVideoTmpPath,
+  getUUIDFromFilename
 }