diff --git a/src/ytdl_sub/config/defaults.py b/src/ytdl_sub/config/defaults.py
index 6746cc82..d29166bf 100644
--- a/src/ytdl_sub/config/defaults.py
+++ b/src/ytdl_sub/config/defaults.py
@@ -23,8 +23,12 @@ if IS_WINDOWS:
     MAX_FILE_NAME_BYTES = 255
 else:
     DEFAULT_LOCK_DIRECTORY = "/tmp"
-    DEFAULT_FFMPEG_PATH = _existing_path("/usr/bin/ffmpeg", "/usr/local/bin/ffmpeg")
-    DEFAULT_FFPROBE_PATH = _existing_path("/usr/bin/ffprobe", "/usr/local/bin/ffmpeg")
+    DEFAULT_FFMPEG_PATH = os.getenv(
+        "YTDL_SUB_FFMPEG_PATH", _existing_path("/usr/bin/ffmpeg", "/usr/local/bin/ffmpeg")
+    )
+    DEFAULT_FFPROBE_PATH = os.getenv(
+        "YTDL_SUB_FFPROBE_PATH", _existing_path("/usr/bin/ffprobe", "/usr/local/bin/ffmpeg")
+    )
 
     MAX_FILE_NAME_BYTES = os.pathconf("/", "PC_NAME_MAX")