diff --git a/lib/pinchflat/downloading/download_option_builder.ex b/lib/pinchflat/downloading/download_option_builder.ex
index 2fb603d..69fd061 100644
--- a/lib/pinchflat/downloading/download_option_builder.ex
+++ b/lib/pinchflat/downloading/download_option_builder.ex
@@ -106,7 +106,6 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilder do
   end
 
   defp quality_options(media_profile) do
-    # TODO: test
     video_codec_option = fn res ->
       [format_sort: "res:#{res},+codec:avc:m4a", remux_video: "mp4"]
     end
diff --git a/test/pinchflat/downloading/download_option_builder_test.exs b/test/pinchflat/downloading/download_option_builder_test.exs
index 5314f89..d5c4dab 100644
--- a/test/pinchflat/downloading/download_option_builder_test.exs
+++ b/test/pinchflat/downloading/download_option_builder_test.exs
@@ -240,6 +240,7 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilderTest do
 
         assert {:ok, res} = DownloadOptionBuilder.build(media_item)
         assert {:format_sort, "res:#{resolution},+codec:avc:m4a"} in res
+        assert {:remux_video, "mp4"} in res
       end)
     end
 
@@ -250,6 +251,8 @@ defmodule Pinchflat.Downloading.DownloadOptionBuilderTest do
 
       assert :extract_audio in res
       assert {:format, "bestaudio[ext=m4a]"} in res
+
+      refute {:remux_video, "mp4"} in res
     end
   end