add a note regarding the /dev/shm RW and a webcam

8 years ago · 28f5da6da4
parent f6f0b77c80
commit 28f5da6da4
1 changed files with 4 additions and 0 deletions
--- a/docker-compose.yml
+++ b/docker-compose.yml
@ -18,6 +18,10 @@ services:
    volumes:
      - /tmp/.X11-unix:/tmp/.X11-unix:ro
      - $XDG_RUNTIME_DIR/pulse:/run/user/1000/pulse
+      # /dev/shm must be RW, otherwise webcam (/dev/video0) won't work
+      # mplayer tv:// -tv driver=v4l2:width=640:height=480:device=/dev/video0
+      #   X11 error: BadAccess (attempt to access private resource denied)
+      #   X11 error: BadShmSeg (invalid shared segment parameter)
      - /dev/shm:/dev/shm
      - data:/data
      - certs:/home/user/.pki/nssdb