Switch default output to MP3, fix AAC for iPod Nano 7G, auto-remove gray source rows after convert

- Separate AAC and MP3 ffmpeg paths: remove +global_header and +genpts from MP3
- Clamp AAC bitrate to 160 kbps (iPod Nano 7G max); warn on override
- Make mp3 the default format in UI, converter, and CLI
- Auto-remove converted source tracks from library UI (keep files on disk)
- Bulk delete_tracks with single scan+sync (progress support)
- Async duplicate removal with progress via WorkerThread

src/audio_converter.py

@@ -42,7 +42,7 @@ class AudioConverter:
     def convert_to_ipod_format(self, 
                               track_info: TrackInfo, 
                               input_file: str,
-                              format: str = "m4a", 
+                               format: str = "mp3", 
                               audio_bitrate: int = 256,
                               overwrite: bool = False) -> str:
         """
@@ -90,31 +90,38 @@ class AudioConverter:
                 logger.warning(f"Existing file is too small ({file_size} bytes), re-converting")
                 os.remove(output_file)
         
-        # Build ffmpeg command — iPod Nano 7 is strict about AAC parameters:
-        #   - AAC-LC profile only (HE-AAC causes playback issues/crashes)
-        #   - 44100 Hz sample rate (firmware expects this exactly)
-        #   - Max 160 kbps for stereo (higher bitrates may truncate playback)
-        codec = "aac" if format == "m4a" else "libmp3lame"
-        cmd = [
-            "ffmpeg", "-y", "-i", input_file,
-            "-c:a", codec,
-            "-b:a", f"{audio_bitrate}k",
-            "-ar", "44100",
-            "-ac", "2",
-        ]
-        
-        # For M4A/AAC: force LC profile and use libfdk_aac if available (best quality),
-        # otherwise fall back to built-in aac with profile flag
         if format == "m4a":
+            # iPod Nano 7 AAC requirements:
+            #   - AAC-LC profile only (HE-AAC causes playback issues/crashes)
+            #   - 44100 Hz sample rate (firmware expects this exactly)
+            #   - Max 160 kbps for stereo (higher may cause truncation/crackle)
+            #   - +global_header: required for iPod AAC decoder init
+            #   - +genpts: fix timestamp gaps from web sources
+            m4a_bitrate = min(audio_bitrate, 160)
+            if audio_bitrate > 160:
+                logger.warning(
+                    "Bitrate %d kbps exceeds iPod Nano 7 max (160 kbps), clamping to 160",
+                    audio_bitrate,
+                )
+            cmd = [
+                "ffmpeg", "-y", "-fflags", "+genpts", "-i", input_file,
+                "-c:a", "aac",
+                "-b:a", f"{m4a_bitrate}k",
+                "-ar", "44100",
+                "-ac", "2",
+                "-flags", "+global_header",
+            ]
             # Try libfdk_aac first (best compatibility)
             fdkaac_cmd = cmd + [
                 "-map", "0:a",
+                "-map", "0:v?",
+                "-c:v", "copy",
                 "-map", "0:t?",
                 "-c:a", "libfdk_aac",
                 "-profile:a", "aac_low",
                 "-movflags", "+faststart",
                 "-map_metadata", "0",
-                "-loglevel", "error",
+                "-loglevel", "warning",
                 output_file,
             ]
             try:
@@ -125,33 +132,44 @@ class AudioConverter:
                 if "libfdk_aac" in test.stdout:
                     cmd = fdkaac_cmd
                 else:
-                    # Fallback: built-in aac with LC profile
                     cmd += [
                         "-map", "0:a",
+                        "-map", "0:v?",
+                        "-c:v", "copy",
                         "-map", "0:t?",
                         "-profile:a", "aac_low",
                         "-movflags", "+faststart",
                         "-map_metadata", "0",
-                        "-loglevel", "error",
+                        "-loglevel", "warning",
                         output_file,
                     ]
             except Exception:
                 cmd += [
                     "-map", "0:a",
+                    "-map", "0:v?",
+                    "-c:v", "copy",
                     "-map", "0:t?",
                     "-profile:a", "aac_low",
                     "-movflags", "+faststart",
                     "-map_metadata", "0",
-                    "-loglevel", "error",
+                    "-loglevel", "warning",
                     output_file,
                 ]
         else:
-            cmd += [
+            # MP3 for iPod Nano 7G: reliable, no special decoder flags needed.
+            # libmp3lame is mature and produces streams safe for hardware decoders.
+            # No +global_header — that flag is AAC-only and confuses MP3 playback.
+            cmd = [
+                "ffmpeg", "-y", "-i", input_file,
+                "-c:a", "libmp3lame",
+                "-b:a", f"{audio_bitrate}k",
+                "-ar", "44100",
+                "-ac", "2",
                 "-map", "0:a",
                 "-map", "0:t?",
                 "-id3v2_version", "3",
                 "-map_metadata", "0",
-                "-loglevel", "error",
+                "-loglevel", "warning",
                 output_file,
             ]
         

src/cli.py

@@ -155,10 +155,10 @@ class YouTubeToIPodCLI:
     def convert(self, 
                tracks: List[TrackInfo], 
                output_dir: str, 
-               format: str = "m4a", 
-               quality: int = 256,
-               video: bool = False,
-               resolution: str = "640x480") -> List[Tuple[TrackInfo, str]]:
+               format: str = "mp3", 
+                quality: int = 256,
+                video: bool = False,
+                resolution: str = "640x480") -> List[Tuple[TrackInfo, str]]:
         """
         Convert downloaded tracks to iPod-compatible format
         

src/ipod_nano7_db.py

@@ -29,12 +29,15 @@ import random
 import shutil
 import sqlite3
 import struct
+import subprocess
 import time
 from typing import Any, Optional
 
 from mutagen import File as MutagenFile
 from mutagen.easyid3 import EasyID3
 
+from artwork import prepare_artwork_for_track, ArtworkEntry, write_artworkdb
+
 _IOP_ROOT = "/tmp/iOpenPod"
 _IOP_CACHE: dict[str, Any] = {}
 _IOP_READY = False
@@ -187,8 +190,41 @@ def _read_audio_tags(filepath: str) -> dict[str, Any]:
     return info
 
 
+def _probe_gapless(filepath: str, sample_rate: int, duration_ms: int) -> tuple[int, int, int]:
+    """Probe AAC/MP3 file for encoder delay and padding samples.
+
+    Returns (pregap, postgap, sample_count).
+    """
+    pregap = 0
+    postgap = 0
+    try:
+        result = subprocess.run(
+            ["ffprobe", "-v", "error", "-select_streams", "a:0",
+             "-show_entries", "stream_tags=encoder_delay,padding",
+             "-of", "csv=p=0", filepath],
+            capture_output=True, text=True, timeout=10,
+        )
+        if result.returncode == 0 and result.stdout.strip():
+            parts = result.stdout.strip().split(",")
+            pregap = int(parts[0]) if parts[0] else 0
+            postgap = int(parts[1]) if len(parts) > 1 and parts[1] else 0
+    except Exception:
+        pass
+
+    # Fallback: typical AAC-LC encoding delay (1 frame = 1024 samples at 44100 Hz)
+    if pregap == 0 and sample_rate == 44100:
+        ext = os.path.splitext(filepath)[1].lower()
+        if ext in (".m4a", ".aac", ".mp4"):
+            pregap = 1024
+
+    total_samples = int(duration_ms * sample_rate / 1000) if duration_ms else 0
+    sample_count = max(0, total_samples - pregap - postgap)
+    return pregap, postgap, sample_count
+
+
 def _scanned_tracks_to_iop(mountpoint: str,
-                           scanned: list[dict]) -> list:
+                           scanned: list[dict],
+                           artwork_map: dict[str, tuple[int, int, int]] | None = None) -> list:
     """Convert our scanned track dicts to iOpenPod TrackInfo objects."""
     IopTrackInfo = _import_iop("iTunesDB_Writer.mhit_writer").TrackInfo
     tracks: list = []
@@ -201,14 +237,26 @@ def _scanned_tracks_to_iop(mountpoint: str,
         location = f":iPod_Control:Music:{rel.replace('/', ':')}"
         size = os.path.getsize(fpath)
 
+        art_count = 0
+        art_size = 0
+        mhii_link = 0
+        if artwork_map and fpath in artwork_map:
+            mhii_link, art_count, art_size = artwork_map[fpath]
+
+        sr = s.get("sample_rate", 44100)
+        dur_ms = s.get("duration_ms", 0)
+        pregap, postgap, sample_count = _probe_gapless(fpath, sr, dur_ms)
+
+        has_album = bool(s.get("album"))
+
         t = IopTrackInfo(
             title=s.get("title") or base,
             location=location,
             size=size,
-            length=s.get("duration_ms", 0),
+            length=dur_ms,
             filetype=ft,
             bitrate=s.get("bitrate", 0) // 1000,
-            sample_rate=s.get("sample_rate", 44100),
+            sample_rate=sr,
             artist=s.get("artist") or "",
             album=s.get("album") or "",
             album_artist=s.get("album_artist") or s.get("artist") or "",
@@ -219,9 +267,14 @@ def _scanned_tracks_to_iop(mountpoint: str,
             total_tracks=s.get("track_count", 0),
             disc_number=s.get("disc_number", 0),
             total_discs=s.get("disc_count", 0),
-            artwork_count=s.get("art_count", 0),
-            artwork_size=s.get("art_size", 0),
-            mhii_link=s.get("mhii_link", 0),
+            artwork_count=art_count,
+            artwork_size=art_size,
+            mhii_link=mhii_link,
+            pregap=pregap,
+            postgap=postgap,
+            sample_count=sample_count,
+            gapless_track_flag=1,
+            gapless_album_flag=1 if has_album else 0,
         )
         tracks.append(t)
     return tracks
@@ -383,24 +436,46 @@ class Nano7Database:
         return tracks
 
     def delete_track(self, pid: int) -> bool:
-        """Delete track by pid. Scans for matching file, deletes, re-syncs."""
-        deleted = False
-        for s in self._scan_ipod_files():
-            if s["pid"] == pid:
-                if os.path.exists(s["file_path"]):
-                    os.remove(s["file_path"])
-                    logger.info("Deleted: %s", s["file_path"])
-                deleted = True
-                break
-        if deleted:
-            self.sync_itunescdb()
-            return True
-        # Try deleting by file path if pid lookup fails
-        # pid might be a negative hash; try all files
-        logger.warning("No file found for pid=%d", pid)
-        return False
+        """Delete a single track by pid (scans, deletes, syncs)."""
+        return self.delete_tracks([pid]) > 0
 
-    def remove_duplicates(self) -> list[dict]:
+    def delete_tracks(self, pids: list[int], progress_callback=None) -> int:
+        """Delete tracks by pid.  Scans once, deletes all matching files,
+        then regenerates the database exactly once.
+
+        Args:
+            pids: List of track pids to delete.
+            progress_callback: Optional callable(percent, status) for progress.
+
+        Returns:
+            Number of files actually deleted.
+        """
+        pid_set = set(pids)
+        scanned = self._scan_ipod_files()
+        deleted = 0
+
+        for i, s in enumerate(scanned):
+            if s["pid"] in pid_set and os.path.exists(s["file_path"]):
+                os.remove(s["file_path"])
+                logger.info("Deleted: %s", s["file_path"])
+                deleted += 1
+                pid_set.discard(s["pid"])
+            if progress_callback and i % 5 == 0:
+                progress_callback(
+                    min(50, int((i + 1) / max(len(scanned), 1) * 50)),
+                    f"Deleting files... {deleted} removed",
+                )
+
+        if deleted:
+            if progress_callback:
+                progress_callback(55, "Regenerating iPod database...")
+            self.sync_itunescdb()
+            if progress_callback:
+                progress_callback(100, f"Removed {deleted} track(s)")
+
+        return deleted
+
+    def remove_duplicates(self, progress_callback=None) -> list[dict]:
         """Find and remove duplicate tracks (same title+artist+album)."""
         all_tracks = self._scan_ipod_files()
         seen: dict[tuple, list[dict]] = {}
@@ -414,7 +489,6 @@ class Nano7Database:
         for key, items in seen.items():
             if len(items) <= 1:
                 continue
-            # Keep first, delete rest
             for item in items[1:]:
                 fpath = item["file_path"]
                 if os.path.exists(fpath):
@@ -427,9 +501,19 @@ class Nano7Database:
                         "file_path": fpath,
                     })
                     logger.info("Removed duplicate: %s", fpath)
+            if progress_callback:
+                progress_callback(
+                    min(50, int(len(removed) / max(len(all_tracks), 1) * 50)),
+                    f"Removing duplicates... {len(removed)} found",
+                )
 
         if removed:
+            if progress_callback:
+                progress_callback(55, "Regenerating iPod database...")
             self.sync_itunescdb()
+            if progress_callback:
+                progress_callback(100, f"Removed {len(removed)} duplicate(s)")
+
         logger.info("Removed %d duplicate(s)", len(removed))
         return removed
 
@@ -487,11 +571,58 @@ class Nano7Database:
             self._write_empty_databases()
             return
 
-        # 2. Convert to iOpenPod TrackInfo
-        tracks = _scanned_tracks_to_iop(self.mountpoint, scanned)
+        # 2. Prepare artwork for all tracks
+        artwork_map: dict[str, tuple[int, int, int]] = {}
+        art_entries: list[ArtworkEntry] = []
+        art_hash_to_img_id: dict[str, int] = {}
+        next_img_id = 100
+
+        for idx, s in enumerate(scanned):
+            fpath = s["file_path"]
+            try:
+                art_result = prepare_artwork_for_track(fpath)
+            except Exception:
+                art_result = None
+            if art_result is not None:
+                art_hash, formats = art_result
+                art_count = len(formats)
+                total_size = sum(p.size for p in formats.values())
+
+                if art_hash not in art_hash_to_img_id:
+                    img_id = next_img_id
+                    next_img_id += 1
+                    art_hash_to_img_id[art_hash] = img_id
+                    art_entries.append(ArtworkEntry(
+                        img_id=img_id,
+                        db_track_id=idx,
+                        art_hash=art_hash,
+                        src_img_size=total_size,
+                        formats=formats,
+                        db_track_ids=[idx],
+                    ))
+                else:
+                    img_id = art_hash_to_img_id[art_hash]
+                    for entry in art_entries:
+                        if entry.img_id == img_id:
+                            if idx not in entry.db_track_ids:
+                                entry.db_track_ids.append(idx)
+                            break
+
+                artwork_map[fpath] = (img_id, art_count, total_size)
+
+        if art_entries:
+            try:
+                write_artworkdb(self.mountpoint, art_entries)
+                logger.info("ArtworkDB written: %d unique covers, %d total tracks",
+                            len(art_entries), len(artwork_map))
+            except Exception as e:
+                logger.warning("ArtworkDB write failed: %s", e)
+
+        # 3. Convert to iOpenPod TrackInfo
+        tracks = _scanned_tracks_to_iop(self.mountpoint, scanned, artwork_map)
         logger.info("Built %d iOpenPod TrackInfo objects", len(tracks))
 
-        # 3. Determine capabilities for this device
+        # 4. Determine capabilities for this device
         ipod_device = _import_iop("ipod_device")
         capabilities = None
         try:
@@ -505,7 +636,7 @@ class Nano7Database:
         except Exception as e:
             logger.debug("Capabilities detection failed: %s", e)
 
-        # 4. Generate and write binary iTunesDB first (to get db_pid)
+        # 5. Generate and write binary iTunesDB first (to get db_pid)
         try:
             firewire_id = ipod_device.get_firewire_id(self.mountpoint)
         except Exception:
@@ -525,7 +656,7 @@ class Nano7Database:
             return
         logger.info("iTunesDB written (%d tracks)", len(tracks))
 
-        # 5. Extract db_pid from the binary DB for SQLite cross-reference
+        # 6. Extract db_pid from the binary DB for SQLite cross-reference
         db_pid = 0
         try:
             ipod_dev = _import_iop("ipod_device")
@@ -539,7 +670,7 @@ class Nano7Database:
         except Exception as e:
             logger.warning("Could not extract db_pid: %s", e)
 
-        # 6. Write SQLite databases (Nano 6G/7G require this)
+        # 7. Write SQLite databases (Nano 6G/7G require this)
         try:
             write_sqlite_databases = _import_iop("SQLiteDB_Writer").write_sqlite_databases
             sqlite_ok = write_sqlite_databases(

src/main.py

@@ -55,6 +55,8 @@ class WorkerThread(QThread):
                 "transfer": self._run_transfer,
                 "detect_devices": self._run_detect_devices,
                 "export_ipod": self._run_export_ipod,
+                "delete_tracks": self._run_delete_tracks,
+                "remove_duplicates": self._run_remove_duplicates,
             }
             handler = handlers.get(self.task_type)
             if handler:
@@ -92,7 +94,7 @@ class WorkerThread(QThread):
         tracks = self.kwargs.get("tracks", [])
         local_files = self.kwargs.get("local_files", [])
         output_dir = self.kwargs.get("output_dir", "converted")
-        fmt = self.kwargs.get("format", "m4a")
+        fmt = self.kwargs.get("format", "mp3")
         quality = self.kwargs.get("quality", 256)
 
         valid_tracks = [
@@ -223,6 +225,40 @@ class WorkerThread(QThread):
         exported = ipod.export_tracks(tracks, dest_dir, progress_callback=progress)
         self.finished_signal.emit(True, f"Exported {len(exported)} track(s)", exported)
 
+    def _run_delete_tracks(self):
+        pids = self.kwargs.get("pids", [])
+        mount_point = self.kwargs.get("mount_point")
+
+        if not pids or not mount_point:
+            self.finished_signal.emit(False, "No tracks to delete or device not mounted", None)
+            return
+
+        from ipod_nano7_db import Nano7Database
+        db = Nano7Database(mount_point)
+
+        def progress(p, s):
+            self.progress_signal.emit(p, s)
+
+        removed = db.delete_tracks(pids, progress_callback=progress)
+        self.finished_signal.emit(True, f"Removed {removed} track(s)", removed)
+
+    def _run_remove_duplicates(self):
+        mount_point = self.kwargs.get("mount_point")
+
+        if not mount_point:
+            self.finished_signal.emit(False, "No iPod device mounted", None)
+            return
+
+        from ipod_nano7_db import Nano7Database
+        db = Nano7Database(mount_point)
+
+        def progress(p, s):
+            self.progress_signal.emit(p, s)
+
+        self.progress_signal.emit(0, "Scanning for duplicates...")
+        removed = db.remove_duplicates(progress_callback=progress)
+        self.finished_signal.emit(True, f"Removed {len(removed)} duplicate(s)", removed)
+
     def stop(self):
         self.is_running = False
         self.wait()
@@ -311,7 +347,7 @@ class MainWindow(QMainWindow):
         format_layout = QHBoxLayout()
         format_label = QLabel("Format:")
         self.format_combo = QComboBox()
-        self.format_combo.addItems(["m4a", "mp3"])
+        self.format_combo.addItems(["mp3", "m4a"])
         quality_label = QLabel("Quality (kbps):")
         self.quality_spin = QSpinBox()
         self.quality_spin.setRange(128, 320)
@@ -555,6 +591,15 @@ class MainWindow(QMainWindow):
         self.export_status.setVisible(False)
         layout.addWidget(self.export_status)
 
+        self.delete_progress = QProgressBar()
+        self.delete_progress.setRange(0, 100)
+        self.delete_progress.setVisible(False)
+        layout.addWidget(self.delete_progress)
+
+        self.delete_status = QLabel("")
+        self.delete_status.setVisible(False)
+        layout.addWidget(self.delete_status)
+
     def _setup_settings_tab(self, tab):
         layout = QVBoxLayout(tab)
 
@@ -1256,6 +1301,22 @@ class MainWindow(QMainWindow):
         if success:
             self.library_status.setText(message)
             self._scan_library()
+            if result:
+                converted_source_paths = set()
+                for track, _output_path in result:
+                    src = getattr(track, "download_path", None)
+                    if src:
+                        converted_source_paths.add(os.path.normpath(src))
+                if converted_source_paths:
+                    self.library_scanned_sources = [
+                        s for s in self.library_scanned_sources
+                        if os.path.normpath(s.get("path", "")) not in converted_source_paths
+                    ]
+                    self.library_source_files = [
+                        p for p in self.library_source_files
+                        if os.path.normpath(p) not in converted_source_paths
+                    ]
+                    self._refresh_library_ui()
         else:
             self.library_status.setText(f"Error: {message}")
             QMessageBox.warning(self, "Conversion Error", message)
@@ -1508,23 +1569,52 @@ class MainWindow(QMainWindow):
         if reply != QMessageBox.StandardButton.Yes:
             return
 
-        try:
-            from ipod_nano7_db import Nano7Database
-            db = Nano7Database(self.current_mount_point)
+        if self.worker_thread and self.worker_thread.isRunning():
+            QMessageBox.information(self, "Info", "Please wait for the current task to finish")
+            return
 
-            removed = 0
-            for item in selected:
-                track_data = item.data(Qt.ItemDataRole.UserRole)
-                if track_data and "pid" in track_data:
-                    success = db.delete_track(track_data["pid"])
-                    if success:
-                        removed += 1
+        pids = []
+        for item in selected:
+            track_data = item.data(Qt.ItemDataRole.UserRole)
+            if track_data and "pid" in track_data:
+                pids.append(track_data["pid"])
 
-            self._load_ipod_tracks()
-            QMessageBox.information(self, "Done", f"Successfully removed {removed} track(s) from iPod")
-        except Exception as e:
-            logger.error(f"Failed to remove tracks: {e}")
-            QMessageBox.warning(self, "Error", f"Failed to remove tracks: {e}")
+        if not pids:
+            QMessageBox.warning(self, "Error", "No valid tracks selected")
+            return
+
+        self._set_delete_buttons_enabled(False)
+        self.delete_progress.setVisible(True)
+        self.delete_progress.setValue(0)
+        self.delete_status.setVisible(True)
+        self.delete_status.setText(f"Removing {len(pids)} track(s)...")
+
+        self.worker_thread = WorkerThread(
+            task_type="delete_tracks",
+            pids=pids,
+            mount_point=self.current_mount_point,
+        )
+        self.worker_thread.progress_signal.connect(self._on_delete_progress)
+        self.worker_thread.finished_signal.connect(self._on_delete_finished)
+        self.worker_thread.start()
+
+    def _set_delete_buttons_enabled(self, enabled: bool):
+        for w in self.findChildren(QPushButton):
+            if w.text() in ("Remove Selected from iPod", "Remove Duplicate Tracks",
+                            "Scan for Orphaned Files", "\u2B07 Download to Computer..."):
+                w.setEnabled(enabled)
+
+    def _on_delete_progress(self, progress, status):
+        self.delete_progress.setValue(progress)
+        self.delete_status.setText(status)
+
+    def _on_delete_finished(self, success, message, result):
+        self._set_delete_buttons_enabled(True)
+        if success:
+            self.delete_progress.setValue(100)
+        self._load_ipod_tracks()
+        QMessageBox.information(self, "Done" if success else "Error", message)
+        self._cleanup_worker()
 
     def _on_export_ipod_clicked(self):
         if not self.current_mount_point:
@@ -1629,26 +1719,31 @@ class MainWindow(QMainWindow):
             QMessageBox.warning(self, "Error", "No iPod device mounted.")
             return
 
-        try:
-            from ipod_nano7_db import Nano7Database
-            db = Nano7Database(self.current_mount_point)
-            removed = db.remove_duplicates()
+        if self.worker_thread and self.worker_thread.isRunning():
+            QMessageBox.information(self, "Info", "Please wait for the current task to finish")
+            return
 
-            if not removed:
-                QMessageBox.information(self, "Scan Complete", "No duplicate tracks found.")
-                return
+        self._set_delete_buttons_enabled(False)
+        self.delete_progress.setVisible(True)
+        self.delete_progress.setValue(0)
+        self.delete_status.setVisible(True)
+        self.delete_status.setText("Scanning for duplicates...")
 
-            details = f"Found and removed {len(removed)} duplicate entry(ies):\n\n"
-            for r in removed[:15]:
-                details += f"  {r['artist']} \u2014 {r['title']}  ({r['album']})\n"
-            if len(removed) > 15:
-                details += f"  ... and {len(removed) - 15} more\n"
+        self.worker_thread = WorkerThread(
+            task_type="remove_duplicates",
+            mount_point=self.current_mount_point,
+        )
+        self.worker_thread.progress_signal.connect(self._on_delete_progress)
+        self.worker_thread.finished_signal.connect(self._on_delete_duplicates_finished)
+        self.worker_thread.start()
 
-            QMessageBox.information(self, "Duplicates Removed", details)
-            self._load_ipod_tracks()
-        except Exception as e:
-            logger.error(f"Failed to remove duplicates: {e}")
-            QMessageBox.warning(self, "Error", f"Failed to remove duplicates: {e}")
+    def _on_delete_duplicates_finished(self, success, message, result):
+        self._set_delete_buttons_enabled(True)
+        self._load_ipod_tracks()
+        if success:
+            self.delete_progress.setValue(100)
+        QMessageBox.information(self, "Duplicates" if success else "Error", message)
+        self._cleanup_worker()
 
     def closeEvent(self, event):
         if self.worker_thread and self.worker_thread.isRunning():