fix-obs-vcam revamped

tools/fix-obs-vcam.sh

@@ -1,4 +1,50 @@
 #!/bin/bash
 
+# https://obsproject.com/kb/virtual-camera-troubleshooting
 # https://obsproject.com/forum/threads/how-to-start-virtual-camera-without-sudo-privileges.139783/
-sudo modprobe v4l2loopback video_nr=2 card_label="OBS Virtual Camera"
+# https://blog.csdn.net/qq_43008667/article/details/128041455
+# https://blog.jbrains.ca/permalink/using-obs-studio-as-a-virtual-cam-on-linux
+# https://github.com/obsproject/obs-studio/issues/4808
+
+# v4l2loopback-dkms
+
+# obs_start()
+# {
+#     #This function is intended to prevent blank cameras in OBS upon OBS restart / exit
+#     #1. load/refresh uvcvideo before starting obs
+#     if lsmod | grep -q 'uvcvideo'; then
+#         sudo rmmod uvcvideo
+#     fi
+#     sudo modprobe uvcvideo
+#     #2. since no environment with a keyring to prompt for allowing virtual webcams prior is a must
+#     sudo modprobe v4l2loopback video_nr=10 card_label='OBS Virtual Camera'
+#     sleep 1
+#     sh -c "$obs_cmd --startvirtualcam || sleep 3; sudo rmmod uvcvideo"
+# }
+
+installed () {
+    command -v $1 > /dev/null
+}
+
+installed 'obs' && obs_cmd='obs'
+installed 'obs-studio' && obs_cmd='obs-studio'
+
+# obs executes this command when you start virtual camera
+# sudo modprobe v4l2loopback exclusive_caps=1 card_label="OBS Virtual Camera"
+
+# another version from one of links below
+# sudo modprobe v4l2loopback video_nr=2 devices=1 card_label="OBS Virtual Camera"
+
+sudo modprobe -r v4l2loopback || sudo rmmod v4l2loopback
+if [[ $? == 0 ]]; then
+    sudo modprobe v4l2loopback video_nr=2 devices=1 card_label="OBS Virtual Camera"
+    if [[ $? == 0 ]]; then
+        $obs_cmd --startvirtualcam & disown
+    else
+        echo "Cannot run modprobe. Ensure v4l2loopback-dkms is installed and try again"
+        exit 1
+    fi
+else
+    echo "Cannot remove v4l2loopback device"
+    exit 2
+fi