diff --git a/pkg/ffmpeg/stream.go b/pkg/ffmpeg/stream.go
index 4f4a11f24..6cc71160b 100644
--- a/pkg/ffmpeg/stream.go
+++ b/pkg/ffmpeg/stream.go
@@ -85,6 +85,7 @@ var CodecVP9 = Codec{
 		"-row-mt", "1",
 		"-crf", "30",
 		"-b:v", "0",
+		"-pix_fmt", "yuv420p",
 	},
 }