update readme

tasks/streamer.yaml

@@ -34,9 +34,10 @@
     audio_device: "hw:{{ sound_ID_0.stdout_lines[0] }},{{ sound_ID_1.stdout_lines[0] }}"
 
 # same with video, the lsusb ID is 534d:0021 
+# v4l2-ctl shows it as "AV TO USB2.0"
 
 - name: video_capture - get video device
-  shell: "v4l2-ctl --list-devices -z {{ lsusb_device_ID }} | grep video | head -n 1 | awk '{print $1}'"
+  shell: "v4l2-ctl --list-devices 2> /dev/null | grep -A3 '{{ v4l2_id_string }}' | grep video | head -n 1 | awk '{print $1}'"
   register: video_ID_0    
 
 - name: video_capture - set video_device