Scene player fixes and improvements (#5340)

* Don't log context canceled error during live transcode
* Pause live transcode if still scrubbing
* Debounce loading live transcode source to avoid multiple ffmpeg instances
* Don't start from start or resume time if seeking before playing
* Play video when seeked before playing

pkg/ffmpeg/stream_transcode.go

@@ -1,6 +1,7 @@
 package ffmpeg
 
 import (
+	"context"
 	"errors"
 	"io"
 	"net/http"
@@ -230,7 +231,10 @@ func (sm *StreamManager) ServeTranscode(w http.ResponseWriter, r *http.Request,
 	handler, err := sm.getTranscodeStream(lockCtx, options)
 
 	if err != nil {
-		logger.Errorf("[transcode] error transcoding video file: %v", err)
+		// don't log context canceled errors
+		if !errors.Is(err, context.Canceled) {
+			logger.Errorf("[transcode] error transcoding video file: %v", err)
+		}
 		w.WriteHeader(http.StatusBadRequest)
 		if _, err := w.Write([]byte(err.Error())); err != nil {
 			logger.Warnf("[transcode] error writing response: %v", err)

ui/v2.5/src/components/ScenePlayer/ScenePlayer.tsx

@@ -451,12 +451,28 @@ export const ScenePlayer: React.FC<IScenePlayerProps> = ({
     if (!player) return;
 
     function canplay(this: VideoJsPlayer) {
+      // if we're seeking before starting, don't set the initial timestamp
+      // when starting from the beginning, there is a small delay before the event
+      // is triggered, so we can't just check if the time is 0
+      if (this.currentTime() >= 0.1) {
+        return;
+      }
+
       if (initialTimestamp.current !== -1) {
         this.currentTime(initialTimestamp.current);
         initialTimestamp.current = -1;
       }
     }
 
+    function timeupdate(this: VideoJsPlayer) {
+      // fired when seeking
+      // check if we haven't started playing yet
+      // if so, start playing
+      if (!started.current) {
+        this.play();
+      }
+    }
+
     function playing(this: VideoJsPlayer) {
       // This still runs even if autoplay failed on Safari,
       // only set flag if actually playing
@@ -477,12 +493,14 @@ export const ScenePlayer: React.FC<IScenePlayerProps> = ({
     player.on("playing", playing);
     player.on("loadstart", loadstart);
     player.on("fullscreenchange", fullscreenchange);
+    player.on("timeupdate", timeupdate);
 
     return () => {
       player.off("canplay", canplay);
       player.off("playing", playing);
       player.off("loadstart", loadstart);
       player.off("fullscreenchange", fullscreenchange);
+      player.off("timeupdate", timeupdate);
     };
   }, [getPlayer]);
 

ui/v2.5/src/components/ScenePlayer/live.ts

@@ -1,3 +1,4 @@
+import { debounce } from "lodash-es";
 import videojs, { VideoJsPlayer } from "video.js";
 
 export interface ISource extends videojs.Tech.SourceObject {
@@ -10,6 +11,9 @@ interface ICue extends TextTrackCue {
   _endTime?: number;
 }
 
+// delay before loading new source after setting currentTime
+const loadDelay = 200;
+
 function offsetMiddleware(player: VideoJsPlayer) {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any -- allow access to private tech methods
   let tech: any;
@@ -50,6 +54,34 @@ function offsetMiddleware(player: VideoJsPlayer) {
     }
   }
 
+  const loadSource = debounce(
+    (seconds: number) => {
+      const srcUrl = new URL(source.src);
+      srcUrl.searchParams.set("start", seconds.toString());
+      source.src = srcUrl.toString();
+
+      const poster = player.poster();
+      const playbackRate = tech.playbackRate();
+      seeking = tech.paused() ? 1 : 2;
+      player.poster("");
+      tech.setSource(source);
+      tech.setPlaybackRate(playbackRate);
+      tech.one("canplay", () => {
+        player.poster(poster);
+        if (seeking === 1 || tech.scrubbing()) {
+          tech.pause();
+        }
+        seeking = 0;
+      });
+      tech.trigger("timeupdate");
+      tech.trigger("pause");
+      tech.trigger("seeking");
+      tech.play();
+    },
+    loadDelay,
+    { leading: true }
+  );
+
   return {
     setTech(newTech: videojs.Tech) {
       tech = newTech;
@@ -144,27 +176,7 @@ function offsetMiddleware(player: VideoJsPlayer) {
 
       updateOffsetStart(seconds);
 
-      const srcUrl = new URL(source.src);
-      srcUrl.searchParams.set("start", seconds.toString());
-      source.src = srcUrl.toString();
-
-      const poster = player.poster();
-      const playbackRate = tech.playbackRate();
-      seeking = tech.paused() ? 1 : 2;
-      player.poster("");
-      tech.setSource(source);
-      tech.setPlaybackRate(playbackRate);
-      tech.one("canplay", () => {
-        player.poster(poster);
-        if (seeking === 1) {
-          tech.pause();
-        }
-        seeking = 0;
-      });
-      tech.trigger("timeupdate");
-      tech.trigger("pause");
-      tech.trigger("seeking");
-      tech.play();
+      loadSource(seconds);
 
       return 0;
     },