fix(Remote playback): kludge to scrub after stream move

src-tauri/src/playback_mode/mod.rs

@@ -181,7 +181,11 @@ impl PlaybackModeManager {
     }
 
     /// Transfer playback from local device to remote Jellyfin session
-    pub async fn transfer_to_remote(&self, session_id: String) -> Result<(), String> {
+    pub async fn transfer_to_remote(
+        &self,
+        session_id: String,
+        position_override: Option<f64>,
+    ) -> Result<(), String> {
         debug!("[PlaybackMode] transfer_to_remote ENTERED");
         debug!("[PlaybackMode] session_id: {}", session_id);
         log::info!(
@@ -195,7 +199,7 @@ impl PlaybackModeManager {
         debug!("[PlaybackMode] Flag set, calling transfer_to_remote_inner");
 
         // Perform the transfer
-        let result = self.transfer_to_remote_inner(&session_id).await;
+        let result = self.transfer_to_remote_inner(&session_id, position_override).await;
 
         // Clear transferring flag
         self.is_transferring.store(false, Ordering::Relaxed);
@@ -203,7 +207,11 @@ impl PlaybackModeManager {
         result
     }
 
-    async fn transfer_to_remote_inner(&self, session_id: &str) -> Result<(), String> {
+    async fn transfer_to_remote_inner(
+        &self,
+        session_id: &str,
+        position_override: Option<f64>,
+    ) -> Result<(), String> {
         log::info!("[PlaybackMode] transfer_to_remote_inner ENTERED");
         debug!("[PlaybackMode] transfer_to_remote_inner: session_id={}", session_id);
 
@@ -231,11 +239,19 @@ impl PlaybackModeManager {
             }
 
             let (ids, adjusted_index) = self.extract_jellyfin_ids(items, original_index)?;
-            // Read the LIVE backend position, not the snapshot embedded in PlayerState.
-            // On Android the embedded position is only refreshed on play/pause
-            // transitions, so PlayerState::position() is stale (often 0) mid-track;
-            // PlayerController::position() always reflects the backend's current time.
-            let position = player.position();
+            // Prefer the frontend-supplied position when available. The backend
+            // position is unreliable as a transfer source: on Linux, *video* plays
+            // in the HTML5 <video> element and the MPV backend is never loaded, so
+            // PlayerController::position() is always 0; only the frontend knows the
+            // true position. We fall back to the live backend position (correct for
+            // Linux audio via MPV) when the frontend doesn't pass one.
+            let position = match position_override {
+                Some(p) => {
+                    log::info!("[PlaybackMode] Using frontend position override: {:.2}s", p);
+                    p
+                }
+                None => player.position(),
+            };
             let context = queue.context().clone();
 
             log::info!(
@@ -413,6 +429,23 @@ impl PlaybackModeManager {
             return Err("Remote session did not load track in time".to_string());
         }
 
+        // Resume at the right position. We send StartPositionTicks in the play
+        // command above, but some Jellyfin client/server combinations ignore it
+        // and start from 0. Now that the track is confirmed loaded, issue an
+        // explicit seek as well (mirrors how the local resume path works). This
+        // is the reliable mechanism; StartPositionTicks is best-effort.
+        if let Some(ticks) = start_position_ticks {
+            log::info!(
+                "[PlaybackMode] Seeking remote session to resume position: {} ticks",
+                ticks
+            );
+            if let Err(e) = client.session_seek(session_id.to_string(), ticks).await {
+                // Non-fatal: the track is already playing, just not at the
+                // resume point. Log and continue rather than failing the transfer.
+                log::warn!("[PlaybackMode] Resume seek on remote failed: {}", e);
+            }
+        }
+
         // Stop local playback (queue should remain intact for remote session)
         log::info!("[PlaybackMode] Stopping local playback - queue should NOT be cleared");
         {