Add sub stream recording with adaptive quality playback (#24009)

* add sub stream recording with adaptive quality playback

Optionally record a second, lower bitrate stream alongside the main
recording stream via a `record_sub` input role and `record.sub` config block, with its own retention windows.
Recordings rows now carry the stream type plus the media details needed to serve both streams from one manifest: video codec, audio presence, audio codec and rate, and a record-time keyframe index.

Playback resolves coverage across both streams and merges them into a single VOD sequence, falling back to a discontinuity manifest with per-clip init segments when the media signatures differ. The player exposes a quality selector, and an auto governor picks the stream from stall time, bandwidth, codec support, and the save-data hint.

* fix tests and i18n

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

@@ -20,6 +20,13 @@ const ffmpegArgsWidget = (
   },
 });
 
+const recordSubArgsWidget = () =>
+  ffmpegArgsWidget("output_args.record_sub", {
+    allowInherit: true,
+    forceSplitLayout: true,
+    unsetLabelKey: "configForm.ffmpegArgs.sameAsRecord",
+  });
+
 const ffmpeg: SectionConfigOverrides = {
   base: {
     sectionDocs: "/configuration/ffmpeg_presets",
@@ -75,6 +82,8 @@ const ffmpeg: SectionConfigOverrides = {
       output_args: "/configuration/ffmpeg_presets#output-args-presets",
       "inputs.output_args": "/configuration/ffmpeg_presets#output-args-presets",
       "output_args.record": "/configuration/ffmpeg_presets#output-args-presets",
+      "output_args.record_sub":
+        "/configuration/ffmpeg_presets#output-args-presets",
       "inputs.roles": "/configuration/cameras/#setting-up-camera-inputs",
       apple_compatibility:
         "/configuration/camera_specific#h265-cameras-via-safari",
@@ -112,9 +121,11 @@ const ffmpeg: SectionConfigOverrides = {
       output_args: {
         detect: arrayAsTextWidget,
         record: ffmpegArgsWidget("output_args.record"),
+        record_sub: recordSubArgsWidget(),
         items: {
           detect: arrayAsTextWidget,
           record: ffmpegArgsWidget("output_args.record"),
+          record_sub: recordSubArgsWidget(),
         },
       },
       inputs: {
@@ -148,6 +159,7 @@ const ffmpeg: SectionConfigOverrides = {
             items: {
               detect: arrayAsTextWidget,
               record: ffmpegArgsWidget("output_args.record"),
+              record_sub: recordSubArgsWidget(),
             },
           },
         },
@@ -176,6 +188,7 @@ const ffmpeg: SectionConfigOverrides = {
       output_args: {
         detect: arrayAsTextWidget,
         record: ffmpegArgsWidget("output_args.record"),
+        record_sub: recordSubArgsWidget(),
       },
     },
   },

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

@@ -15,6 +15,19 @@ const record: SectionConfigOverrides = {
           );
         },
       },
+      {
+        key: "no-record-sub-role",
+        messageKey: "configMessages.record.noRecordSubRole",
+        severity: "warning",
+        condition: (ctx) => {
+          if (ctx.level !== "camera" || !ctx.fullCameraConfig) return false;
+          const sub = ctx.formData?.sub as Record<string, unknown> | undefined;
+          if (!sub?.enabled) return false;
+          return !ctx.fullCameraConfig.ffmpeg?.inputs?.some((i) =>
+            i.roles?.includes("record_sub"),
+          );
+        },
+      },
     ],
     fieldDocs: {
       "alerts.pre_capture":
@@ -34,6 +47,7 @@ const record: SectionConfigOverrides = {
       "motion",
       "alerts",
       "detections",
+      "sub",
       "preview",
       "export",
     ],
@@ -67,6 +81,12 @@ const record: SectionConfigOverrides = {
       "detections.retain.mode": {
         "ui:options": { enumI18nPrefix: "retainMode" },
       },
+      "sub.alerts.mode": {
+        "ui:options": { enumI18nPrefix: "retainMode" },
+      },
+      "sub.detections.mode": {
+        "ui:options": { enumI18nPrefix: "retainMode" },
+      },
       preview: {
         "ui:options": { defaultOpen: true, disableCollapsible: true },
         quality: {