diff --git a/src/streamlink/stream/ffmpegmux.py b/src/streamlink/stream/ffmpegmux.py
index 258b314a..c493e010 100644
--- a/src/streamlink/stream/ffmpegmux.py
+++ b/src/streamlink/stream/ffmpegmux.py
@@ -80,7 +80,7 @@ class MuxedStream(Stream, Generic[TSubstreams]):
 
 
 class FFMPEGMuxer(StreamIO):
-    __commands__: ClassVar[List[str]] = ["ffmpeg"]
+    __commands__: ClassVar[List[str]] = ["@ffmpeg@"]
 
     DEFAULT_OUTPUT_FORMAT = "matroska"
     DEFAULT_VIDEO_CODEC = "copy"