warn when a camera input points at a missing go2rtc stream

web/public/locales/en/views/settings.json

@@ -1936,7 +1936,8 @@
       "inputDimensionsNotDetectResolution": "Model input width and height are the input dimensions of the object detection model, not your camera's detect resolution. They should match the dimensions of the model you're using — typically a square size like 320x320 or 640x640."
     },
     "ffmpeg": {
-      "hwaccelManualNotRecommended": "Manual hardware acceleration arguments are not recommended. Unless a specific requirement exists, select the preset that matches your hardware."
+      "hwaccelManualNotRecommended": "Manual hardware acceleration arguments are not recommended. Unless a specific requirement exists, select the preset that matches your hardware.",
+      "inputsMissingGo2rtcStream": "An input below points at a go2rtc restream that no longer exists. Select an existing restream or enter the camera's URL manually, otherwise this camera will fail to connect."
     },
     "objects": {
       "genaiNoDescriptionsProvider": "You must configure a GenAI provider with the 'descriptions' role for descriptions to be generated."

web/src/components/config-form/section-configs/ffmpeg.ts

@@ -1,3 +1,4 @@
+import { parseRestreamStreamName } from "../theme/fields/streamSource";
 import type { SectionConfigOverrides } from "./types";
 
 const arrayAsTextWidget = {
@@ -42,6 +43,29 @@ const ffmpeg: SectionConfigOverrides = {
           return false;
         },
       },
+      {
+        key: "inputs-missing-go2rtc-stream",
+        field: "inputs",
+        position: "before",
+        messageKey: "configMessages.ffmpeg.inputsMissingGo2rtcStream",
+        severity: "warning",
+        docLink: "/configuration/restream",
+        condition: (ctx) => {
+          const streams = ctx.fullConfig?.go2rtc?.streams;
+          const inputs = ctx.formData?.inputs;
+          if (!Array.isArray(inputs)) {
+            return false;
+          }
+
+          return inputs.some((input) => {
+            const path = (input as { path?: unknown } | null)?.path;
+            const streamName = parseRestreamStreamName(
+              typeof path === "string" ? path : undefined,
+            );
+            return streamName !== undefined && !(streamName in (streams ?? {}));
+          });
+        },
+      },
     ],
     fieldDocs: {
       hwaccel_args: "/configuration/ffmpeg_presets#hwaccel-presets",