implement native recording (#1399) (#2255)

* implement native recording (#1399)

* support saving VP9 tracks

* support saving MPEG-1 audio tracks

* switch segment when codec parameters change

* allow to disable recording on a path basis

* allow disabling recording cleaner

* support recording MPEG-1/2/4 video tracks

* add microseconds to file names

* add tests

apidocs/openapi.yaml

@@ -175,6 +175,20 @@ components:
         srtAddress:
           type: string
 
+        # Record
+        record:
+          type: boolean
+        recordPath:
+          type: string
+        recordFormat:
+          type: string
+        recordPartDuration:
+          type: string
+        recordSegmentDuration:
+          type: string
+        recordDeleteAfter:
+          type: string
+
         # Paths
         paths:
           type: object
@@ -197,6 +211,8 @@ components:
           type: string
         maxReaders:
           type: integer
+        record:
+          type: boolean
 
         # Authentication
         publishUser: