configurable ffmpeg timeout (#6897)

* configurable ffmpeg timeout

* configurable ffmpeg healthcheck interval

rename timeout to healthcheck_interval
only grab config value once

* configurable ffmpeg retry interval

rename healthcheck_interval to retry_interval

* add retry_interval to docs

- update retry_interval text in config.py

frigate/config.py

@@ -463,6 +463,10 @@ class FfmpegConfig(FrigateBaseModel):
         default_factory=FfmpegOutputArgsConfig,
         title="FFmpeg output arguments per role.",
     )
+    retry_interval: float = Field(
+        default=10.0,
+        title="Time in seconds to wait before FFmpeg retries connecting to the camera.",
+    )
 
 
 class CameraRoleEnum(str, Enum):