add notes for Blue Iris RTSP support

docs/cameras.md

@@ -5,7 +5,7 @@ Frigate should work with most RTSP cameras and h264 feeds such as Dahua.
 The input parameters need to be adjusted for RTMP cameras
 ```yaml
 ffmpeg:
-input_args:
+  input_args:
     - -avoid_negative_ts
     - make_zero
     - -fflags
@@ -18,4 +18,25 @@ input_args:
     - +genpts+discardcorrupt
     - -use_wallclock_as_timestamps
     - '1'
-```
+```
+
+## Blue Iris RTSP Cameras
+You will need to remove `nobuffer` flag for Blue Iris RTSP cameras
+```yaml
+ffmpeg:
+  input_args:
+    - -avoid_negative_ts
+    - make_zero
+    - -flags
+    - low_delay
+    - -strict
+    - experimental
+    - -fflags
+    - +genpts+discardcorrupt
+    - -rtsp_transport
+    - tcp
+    - -stimeout
+    - "5000000"
+    - -use_wallclock_as_timestamps
+    - "1"
+```