Encode different episodes simultaneously

This results in less nice log output, but if it’s faster then who cares?

encode.py

@@ -1,7 +1,8 @@
 #!/usr/bin/env python3
 import base64
+import concurrent.futures
+import multiprocessing
 import os
-import threading
 import xml.etree.ElementTree as ET
 from datetime import datetime
 from subprocess import run
@@ -77,9 +78,9 @@ def encode_episode(podcast, episode, format):
 
             audio.save()
 
-        print(f" {format}", end="", flush=True)
+        print(f"[✔️] {episode['file_base']}.{format}")
     else:
-        print(f" ({format})", end="", flush=True)
+        print(f"[⏭️] {episode['file_base']}.{format}")
 
 
 os.makedirs("static/episodes", exist_ok=True)
@@ -95,6 +96,8 @@ podcast = {
     "poster": "static" + urlparse(channel.find("image").find("url").text).path,
 }
 
+pool = concurrent.futures.ThreadPoolExecutor(max_workers=multiprocessing.cpu_count())
+
 for item in channel.findall("item"):
     episode = {
         "title": item.find("title").text,
@@ -114,18 +117,7 @@ for item in channel.findall("item"):
         )[0],
     }
 
-    print(episode["file_base"], end="", flush=True)
-
-    threads = []
-
     for format in common.FORMATS.items():
-        thread = threading.Thread(
-            target=encode_episode, args=(podcast, episode, format), daemon=True
-        )
-        thread.start()
-        threads.append(thread)
+        pool.submit(encode_episode, podcast, episode, format)
 
-    for thread in threads:
-        thread.join()
-
-    print()
+pool.shutdown(wait=True)