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

src-tauri/src/commands/playback_mode.rs

@@ -41,12 +41,14 @@ pub fn playback_mode_is_transferring(
 pub async fn playback_mode_transfer_to_remote(
     manager: State<'_, PlaybackModeManagerWrapper>,
     session_id: String,
+    position: Option<f64>,
 ) -> Result<(), String> {
     log::info!(
-        "[PlaybackModeCommands] Transferring to remote session: {}",
-        session_id
+        "[PlaybackModeCommands] Transferring to remote session: {} (position override: {:?})",
+        session_id,
+        position
     );
-    manager.0.transfer_to_remote(session_id).await
+    manager.0.transfer_to_remote(session_id, position).await
 }
 
 /// Transfer playback from remote session back to local device

src-tauri/src/commands/player/mod.rs

@@ -1249,6 +1249,59 @@ pub(super) fn get_queue_status(controller: &PlayerController) -> QueueStatus {
     }
 }
 
+/// Start a freshly-built queue on the active remote session.
+///
+/// Used by the "play tracks"/"play album track" commands when we're in remote
+/// mode: instead of starting local MPV playback, we cast the selected tracks to
+/// the remote device. Mirrors PlaybackModeManager::transfer_to_remote's
+/// play_on_session call, but for a brand-new selection (so there's no resume
+/// position - playback starts from the chosen track's beginning).
+///
+/// Local-only items (no Jellyfin ID) can't be cast, so they're filtered out and
+/// the start index is adjusted to the remaining Jellyfin items. Returns an error
+/// if the selected track itself has no Jellyfin ID.
+async fn play_selection_on_remote(
+    controller: &PlayerController,
+    session_id: &str,
+    media_items: &[MediaItem],
+    start_index: usize,
+) -> Result<(), String> {
+    // Collect Jellyfin IDs, tracking where the selected track lands after any
+    // local-only items are dropped.
+    let mut jellyfin_ids: Vec<String> = Vec::new();
+    let mut adjusted_index: Option<usize> = None;
+    for (i, item) in media_items.iter().enumerate() {
+        if let Some(id) = item.jellyfin_id() {
+            if i == start_index {
+                adjusted_index = Some(jellyfin_ids.len());
+            }
+            jellyfin_ids.push(id.to_string());
+        }
+    }
+
+    let start_index = adjusted_index
+        .ok_or("Cannot play on remote: selected track is not from Jellyfin")?;
+
+    if jellyfin_ids.is_empty() {
+        return Err("Cannot play on remote: no Jellyfin tracks in selection".to_string());
+    }
+
+    let client = {
+        let client_arc = controller.jellyfin_client();
+        let client_opt = client_arc.lock().map_err(|e| e.to_string())?;
+        client_opt
+            .as_ref()
+            .ok_or("Jellyfin client not configured")?
+            .clone()
+    };
+
+    // Fresh selection: start from the beginning of the chosen track.
+    client
+        .play_on_session(session_id.to_string(), jellyfin_ids, start_index, None)
+        .await
+        .map_err(|e| format!("Failed to start playback on remote session: {}", e))
+}
+
 
 /// Play a track from an album - backend fetches all album tracks and builds queue
 #[tauri::command]
@@ -1258,6 +1311,7 @@ pub async fn player_play_album_track(
     session: State<'_, MediaSessionManagerWrapper>,
     db: State<'_, DatabaseWrapper>,
     repository_manager: State<'_, super::repository::RepositoryManagerWrapper>,
+    playback_mode: State<'_, super::playback_mode::PlaybackModeManagerWrapper>,
     repository_handle: String,
     request: PlayAlbumTrackRequest,
 ) -> Result<PlayerStatus, String> {
@@ -1380,11 +1434,24 @@ pub async fn player_play_album_track(
         session_mgr.start_audio_session(first_item.clone());
     }
 
-    // Play the queue
     let controller = player.0.lock().await;
-    controller
-        .play_queue(media_items, start_index)
-        .map_err(|e| e.to_string())?;
+
+    // When controlling a remote session, cast the selection there instead of
+    // starting local MPV playback. We still load the queue locally (below) so
+    // the queue/context stay in sync for the UI and for transferring back.
+    let remote_session = match playback_mode.0.get_mode() {
+        crate::playback_mode::PlaybackMode::Remote { session_id } => Some(session_id),
+        _ => None,
+    };
+
+    if let Some(session_id) = &remote_session {
+        play_selection_on_remote(&controller, session_id, &media_items, start_index).await?;
+        controller.set_queue(media_items, start_index).map_err(|e| e.to_string())?;
+    } else {
+        controller
+            .play_queue(media_items, start_index)
+            .map_err(|e| e.to_string())?;
+    }
 
     // Set the queue context for remote transfer
     {
@@ -1426,6 +1493,7 @@ pub async fn player_play_tracks(
     session: State<'_, MediaSessionManagerWrapper>,
     db: State<'_, DatabaseWrapper>,
     repository_manager: State<'_, super::repository::RepositoryManagerWrapper>,
+    playback_mode: State<'_, super::playback_mode::PlaybackModeManagerWrapper>,
     repository_handle: String,
     request: PlayTracksRequest,
 ) -> Result<PlayerStatus, String> {
@@ -1533,10 +1601,33 @@ pub async fn player_play_tracks(
         session_mgr.start_audio_session(first_item.clone());
     }
 
-    // Play queue
     let controller = player.0.lock().await;
-    controller.play_queue_from(media_items, request.start_index, request.start_position)
-        .map_err(|e| e.to_string())?;
+
+    // When controlling a remote session, cast the selection there instead of
+    // starting local MPV playback. Skip this while a transfer is in flight: the
+    // transfer-to-local path calls this command to load the queue locally and
+    // the mode is still Remote until the transfer completes - routing it back to
+    // the remote would undo the transfer.
+    let remote_session = match playback_mode.0.get_mode() {
+        crate::playback_mode::PlaybackMode::Remote { session_id }
+            if !playback_mode.0.is_transferring() =>
+        {
+            Some(session_id)
+        }
+        _ => None,
+    };
+
+    if let Some(session_id) = &remote_session {
+        play_selection_on_remote(&controller, session_id, &media_items, request.start_index)
+            .await?;
+        controller
+            .set_queue(media_items, request.start_index)
+            .map_err(|e| e.to_string())?;
+    } else {
+        controller
+            .play_queue_from(media_items, request.start_index, request.start_position)
+            .map_err(|e| e.to_string())?;
+    }
 
     // Set queue context
     {

src-tauri/src/jellyfin/client.rs

@@ -284,22 +284,35 @@ impl JellyfinClient {
     }
 
     /// Seek on a remote session
+    ///
+    /// Jellyfin's `/Sessions/{id}/Playing/Seek` endpoint takes the target as the
+    /// `SeekPositionTicks` *query parameter*, not a JSON body. Sending it in the
+    /// body (as we used to) is silently ignored and the remote never seeks.
     pub async fn session_seek(
         &self,
         session_id: String,
         position_ticks: i64,
     ) -> Result<(), String> {
-        #[derive(serde::Serialize)]
-        #[serde(rename_all = "PascalCase")]
-        struct SeekRequest {
-            seek_position_ticks: i64,
+        let url = format!(
+            "{}/Sessions/{}/Playing/Seek?SeekPositionTicks={}",
+            self.config.server_url, session_id, position_ticks
+        );
+
+        let response = self.http_client
+            .post(&url)
+            .header("X-Emby-Authorization", self.get_auth_header())
+            .send()
+            .await
+            .map_err(|e| format!("Network request failed: {}", e))?;
+
+        let status = response.status();
+        if !status.is_success() {
+            let error_text = response.text().await.unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(format!("Jellyfin API error {}: {}", status.as_u16(), error_text));
         }
 
-        let request = SeekRequest {
-            seek_position_ticks: position_ticks,
-        };
-
-        self.post(&format!("/Sessions/{}/Playing/Seek", session_id), &request).await
+        log::info!("[JellyfinClient] Seek to {} ticks on session {}", position_ticks, session_id);
+        Ok(())
     }
 
     /// Send a full GeneralCommand to a remote session.

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");
         {

src-tauri/src/player/mod.rs

@@ -358,6 +358,23 @@ impl PlayerController {
         Ok(())
     }
 
+    /// Replace the queue without starting local playback.
+    ///
+    /// Used when we're controlling a remote session: the tracks play on the
+    /// remote device, but we keep the local queue in sync so the UI reflects
+    /// what's playing and a later transfer-to-local has the queue to resume.
+    pub fn set_queue(&self, items: Vec<MediaItem>, start_index: usize) -> Result<(), PlayerError> {
+        debug!(
+            "[PlayerController] set_queue (no local playback): {} items, index {}",
+            items.len(),
+            start_index
+        );
+        self.reset_autoplay_count();
+        let mut queue = self.queue.lock_safe();
+        queue.set_queue(items, start_index);
+        Ok(())
+    }
+
     /// Play/resume playback
     pub fn play(&self) -> Result<(), PlayerError> {
         debug!("[PlayerController] play");