Silent timeline removed when hitting export

handlers/export.go

@@ -14,6 +14,13 @@ import (
 type exportRequest struct {
 	Filename string              `json:"filename"`
 	Segments []transcode.Segment `json:"segments"`
+	Duration float64             `json:"duration"`
+}
+
+type updateTimeLine struct {
+	Type     string              `json:"type"`
+	Segments []transcode.Segment `json:"segments"`
+	Duration float64             `json:"duration"`
 }
 
 func ExportHandler(st *store.Store, hub *ws.Hub) http.HandlerFunc {
@@ -28,6 +35,7 @@ func ExportHandler(st *store.Store, hub *ws.Hub) http.HandlerFunc {
 			http.Error(w, "bad JSON: "+err.Error(), http.StatusBadRequest)
 			return
 		}
+
 		if len(req.Segments) == 0 {
 			http.Error(w, "no segments", http.StatusBadRequest)
 			return
@@ -50,15 +58,30 @@ func ExportHandler(st *store.Store, hub *ws.Hub) http.HandlerFunc {
 				return
 			}
 
-			msg, _ := json.Marshal(map[string]string{
+			doneMsg, _ := json.Marshal(map[string]string{
 				"type":    "done",
 				"message": outputKey,
 			})
-			hub.Broadcast(msg)
+			hub.Broadcast(doneMsg)
+
+			// Build normalized segments for the exported video: timestamps start at 0
+			// with no gaps, so the timeline reflects the exported file's layout.
+			var normalized []transcode.Segment
+			cursor := 0.0
+			for _, seg := range req.Segments {
+				dur := seg.End - seg.Start
+				normalized = append(normalized, transcode.Segment{Start: cursor, End: cursor + dur})
+				cursor += dur
+			}
+			timelineMsg, _ := json.Marshal(updateTimeLine{
+				Type:     "timeline",
+				Segments: normalized,
+				Duration: cursor,
+			})
+			hub.Broadcast(timelineMsg)
 		}()
 
 		w.WriteHeader(http.StatusAccepted)
-
 		log.Println("Export handler works")
 	}
 }