diff --git a/media/Makefile b/media/Makefile
index 4e7d439f26..12b5246fe6 100644
--- a/media/Makefile
+++ b/media/Makefile
@@ -2,7 +2,7 @@ all: blank.mkv blank.ptna
 
 blank.mkv:
 	#120 frames @ 30 FPS == 4 seconds
-	gst-launch-1.0 videotestsrc num-buffers=120 pattern=smpte ! 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)30/1' ! av1enc ! queue ! mux. audiotestsrc num-buffers=400 freq=0 samplesperbuffer=441 ! 'audio/x-raw,rate=48000,channels=2' ! opusenc ! queue ! mux. matroskamux name=mux ! filesink location=blank.mkv
+	gst-launch-1.0 videotestsrc num-buffers=160 horizontal-speed=2 ! 'video/x-raw,format=(string)I420,width=320,height=240,framerate=(fraction)30/1' ! textoverlay text="Missing audio or video codecs" valignment=center font-desc="Sans 32" ! av1enc ! queue ! mux. audiotestsrc num-buffers=400 wave=silence samplesperbuffer=441 ! 'audio/x-raw,rate=48000,channels=2' ! opusenc ! queue ! mux. matroskamux name=mux ! filesink location=blank.mkv
 
 make_blank_ptna: make_blank_ptna.c
 	gcc -Wall -O2 $(shell pkg-config --cflags opus) -o $@ $< -lm $(shell pkg-config --libs opus)