Introduce worker threads to process remote images

server/initializers/constants.ts

@@ -744,8 +744,11 @@ const MEMOIZE_LENGTH = {
   VIDEO_DURATION: 200
 }
 
-const QUEUE_CONCURRENCY = {
-  ACTOR_PROCESS_IMAGE: 3
+const WORKER_THREADS = {
+  DOWNLOAD_IMAGE: {
+    CONCURRENCY: 3,
+    MAX_THREADS: 1
+  }
 }
 
 const REDUNDANCY = {
@@ -955,7 +958,7 @@ export {
   VIDEO_PRIVACIES,
   VIDEO_LICENCES,
   VIDEO_STATES,
-  QUEUE_CONCURRENCY,
+  WORKER_THREADS,
   VIDEO_RATE_TYPES,
   JOB_PRIORITY,
   VIDEO_TRANSCODING_FPS,