diff --git a/imageio_ffmpeg/_io.py b/imageio_ffmpeg/_io.py
index b85c453..faf1ee8 100644
--- a/imageio_ffmpeg/_io.py
+++ b/imageio_ffmpeg/_io.py
@@ -153,8 +153,8 @@ def count_frames_and_secs(path):
         path,
         "-map",
         "0:v:0",
-        "-c",
-        "copy",
+        "-vf",
+        "null",
         "-f",
         "null",
         "-",