Add clock_source since we are generating the video feed

testvideo.sh

@@ -1,6 +1,6 @@
 #!/usr/bin/env bash
 
-~/ndi/ffmpeg/ffmpeg \
+ffmpeg \
   -s 1280x720 \
   -framerate '30' \
   -f rawvideo \
@@ -9,4 +9,6 @@
   -vf "drawbox=enable='mod(n,2)':w=iw:h=ih:c=green:t=ih*0.02,drawbox=enable='not(mod(n,2))':w=iw:h=ih:c=blue:t=ih*0.02,drawtext=text='':timecode='00\:00\:00\:00':rate=30000/1000:x=(w-tw)/2:y=h-(h-th)/2:fontcolor=white:fontsize=90:box=0" \
   -pix_fmt uyvy422 \
   -f libndi_newtek \
-  -y video1
+  -clock_video true \
+  -clock_audio true \
+  -y TEST