Feature: automatic camera resolution configuration (#6810)

* Add auto configuration for height, width and fps in detect role

* Add auto-configuration for detect width, height, and fps for input roles with detect in the CameraConfig class in config.py

* Refactor code to retrieve video properties from input stream in CameraConfig class and add optional parameter to retrieve video duration in get_video_properties function

* format

* Set default detect dimensions to 1280x720 and update DetectConfig to use the defaults

* Revert "Set default detect dimensions to 1280x720 and update DetectConfig to use the defaults"

This reverts commit a1aed0414d.

* Add default detect dimensions if autoconfiguration failed and log a warning message

* fix warn message spelling on frigate/config.py

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Ensure detect height and width are not None before using them in camera configuration

* docs: initial commit

* rename streamInfo to stream_info

Co-authored-by: Blake Blackshear <blakeb@blakeshome.com>

* Apply suggestions from code review

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>

* Update docs

* handle case then get_video_properties returns 0x0 dimension

* Set detect resolution based on stream properties if available, else apply default values

* Update FrigateConfig to set default values for stream_info if resolution detection fails

* Update camera detection dimensions based on stream information if available

---------

Co-authored-by: Nicolas Mowen <nickmowen213@gmail.com>
Co-authored-by: Blake Blackshear <blakeb@blakeshome.com>

docs/docs/configuration/camera_specific.md

@@ -80,8 +80,8 @@ cameras:
     rtmp:
       enabled: False # <-- RTMP should be disabled if your stream is not H264
     detect:
-      width: # <---- update for your camera's resolution
+      width: # <- optional, by default Frigate tries to automatically detect resolution 
-      height: # <---- update for your camera's resolution
+      height: # <- optional, by default Frigate tries to automatically detect resolution 
 ```
 
 ### Blue Iris RTSP Cameras

docs/docs/configuration/cameras.md

@@ -33,8 +33,8 @@ cameras:
           roles:
             - record
     detect:
-      width: 1280
+      width: 1280 # <- optional, by default Frigate tries to automatically detect resolution 
-      height: 720
+      height: 720 # <- optional, by default Frigate tries to automatically detect resolution 
 ```
 
 Additional cameras are simply added to the config under the `cameras` entry.

docs/docs/configuration/index.md

@@ -19,9 +19,6 @@ cameras:
         - path: rtsp://viewer:{FRIGATE_RTSP_PASSWORD}@10.0.10.10:554/cam/realmonitor?channel=1&subtype=2
           roles:
             - detect
-    detect:
-      width: 1280
-      height: 720
 ```
 
 ### VSCode Configuration Schema

docs/docs/development/contributing.md

@@ -68,10 +68,6 @@ cameras:
           input_args: -re -stream_loop -1 -fflags +genpts
           roles:
             - detect
-    detect:
-      height: 1080
-      width: 1920
-      fps: 5
 ```
 
 These input args tell ffmpeg to read the mp4 file in an infinite loop. You can use any valid ffmpeg input here.

docs/docs/guides/getting_started.md

@@ -22,8 +22,6 @@ cameras:
             - detect
     detect:
       enabled: False # <---- disable detection until you have a working camera feed
-      width: 1280 # <---- update for your camera's resolution
-      height: 720 # <---- update for your camera's resolution
 ```
 
 ### Step 2: Start Frigate
@@ -105,9 +103,6 @@ cameras:
         - path: rtsp://10.0.10.10:554/rtsp
           roles:
             - detect
-    detect:
-      width: 1280
-      height: 720
     motion:
       mask:
         - 0,461,3,0,1919,0,1919,843,1699,492,1344,458,1346,336,973,317,869,375,866,432

frigate/config.py

@@ -26,6 +26,7 @@ from frigate.util.builtin import (
     deep_merge,
     escape_special_characters,
     get_ffmpeg_arg_list,
+    get_video_properties,
     load_config_with_no_duplicates,
 )
 from frigate.util.image import create_mask
@@ -42,6 +43,7 @@ FRIGATE_ENV_VARS = {k: v for k, v in os.environ.items() if k.startswith("FRIGATE
 DEFAULT_TRACKED_OBJECTS = ["person"]
 DEFAULT_LISTEN_AUDIO = ["bark", "speech", "yell", "scream"]
 DEFAULT_DETECTORS = {"cpu": {"type": "cpu"}}
+DEFAULT_DETECT_DIMENSIONS = {"width": 1280, "height": 720}
 
 
 class FrigateBaseModel(BaseModel):
@@ -284,8 +286,8 @@ class StationaryConfig(FrigateBaseModel):
 
 
 class DetectConfig(FrigateBaseModel):
-    height: int = Field(default=720, title="Height of the stream for the detect role.")
+    height: Optional[int] = Field(title="Height of the stream for the detect role.")
-    width: int = Field(default=1280, title="Width of the stream for the detect role.")
+    width: Optional[int] = Field(title="Width of the stream for the detect role.")
     fps: int = Field(
         default=5, title="Number of frames per second to process through detection."
     )
@@ -1020,6 +1022,32 @@ class FrigateConfig(FrigateBaseModel):
                 {"name": name, **merged_config}
             )
 
+            if (
+                camera_config.detect.height is None
+                or camera_config.detect.width is None
+            ):
+                for input in camera_config.ffmpeg.inputs:
+                    if "detect" in input.roles:
+                        stream_info = {"width": 0, "height": 0}
+                        try:
+                            stream_info = get_video_properties(input.path)
+                        except Exception:
+                            logger.warn(
+                                f"Error detecting stream resolution automatically for {input.path} Applying default values."
+                            )
+                            stream_info = {"width": 0, "height": 0}
+
+                        camera_config.detect.width = (
+                            stream_info["width"]
+                            if stream_info.get("width")
+                            else DEFAULT_DETECT_DIMENSIONS["width"]
+                        )
+                        camera_config.detect.height = (
+                            stream_info["height"]
+                            if stream_info.get("height")
+                            else DEFAULT_DETECT_DIMENSIONS["height"]
+                        )
+
             # Default max_disappeared configuration
             max_disappeared = camera_config.detect.fps * 5
             if camera_config.detect.max_disappeared is None: