From 9da1a87f3025ea3b9c40427dd9d1a3aab1940e7b Mon Sep 17 00:00:00 2001
From: rany <ranygh@riseup.net>
Date: Thu, 10 Mar 2022 15:49:20 +0200
Subject: [PATCH] only speed up, don't slow down

---
 examples/02_subrip_to_mp3.py | 33 ++++++++++++++++++---------------
 1 file changed, 18 insertions(+), 15 deletions(-)

diff --git a/examples/02_subrip_to_mp3.py b/examples/02_subrip_to_mp3.py
index 3670239..b5714aa 100755
--- a/examples/02_subrip_to_mp3.py
+++ b/examples/02_subrip_to_mp3.py
@@ -46,21 +46,24 @@ def ensure_audio_length(in_file, out_file, length):
         atempo = 0.5
     elif atempo > 100:
         atempo = 100
-    process = subprocess.call(
-        [
-            "ffmpeg",
-            "-y",
-            "-i",
-            in_file,
-            "-filter:a",
-            f"atempo={atempo}",
-            out_file,
-        ],
-        stdout=subprocess.DEVNULL,
-        stderr=subprocess.DEVNULL,
-    )
-    if process != 0:
-        raise Exception("ffmpeg failed")
+    if atempo > 1:
+        process = subprocess.call(
+            [
+                "ffmpeg",
+                "-y",
+                "-i",
+                in_file,
+                "-filter:a",
+                f"atempo={atempo}",
+                out_file,
+            ],
+            stdout=subprocess.DEVNULL,
+            stderr=subprocess.DEVNULL,
+        )
+        if process != 0:
+            raise Exception("ffmpeg failed")
+    else:
+        shutil.copyfile(in_file, out_file)
 
 
 async def _main(srt_data, voice_name, out_file):