Fix cover metadata bugs: concurrency locks and FFmpeg video stream stripping

fcco_converter/converter.py

@@ -115,6 +115,9 @@ def _build_ffmpeg_cmd(
     else:
         cmd.append("-n")
 
+    # Keine Video/Bilder-Streams übernehmen (verhindert Konflikte mit eigenen Covern)
+    cmd.append("-vn")
+
     cmd.append(str(output_path))
     return cmd
 
@@ -190,6 +193,8 @@ def convert_file_entry(
     audio_settings: dict | None = None,
     threads: int = 0,
     progress_callback: Callable[[int, int, str], None] | None = None,
+    cover_data: bytes | None = None,
+    cover_mime: str = "image/jpeg",
 ) -> tuple[int, str, str | None]:
     """Konvertiert eine Datei und schreibt die Metadaten.
 
@@ -227,7 +232,6 @@ def convert_file_entry(
 
         # ID3-Metadaten nur für MP3 schreiben
         if output_format == "mp3":
-            cover_path = Path(meta["cover"]) if meta.get("cover") else None
             apply_id3_tags(
                 mp3_path=output_file,
                 title=title,
@@ -235,7 +239,8 @@ def convert_file_entry(
                 album=meta.get("album", ""),
                 track_number=index + 1,
                 year=meta.get("year", ""),
-                cover_path=cover_path,
+                cover_data=cover_data,
+                cover_mime=cover_mime,
             )
 
         return (index, f"{title}.{output_format}", None)
@@ -266,6 +271,19 @@ def run_batch_conversion(
     successful_files = []
     errors = []
 
+    # Cover-Bild einmalig in den Arbeitsspeicher laden, um Dateisperren (Locking)
+    # bei parallelem Zugriff durch Windows Defender/Antivirus zu vermeiden
+    cover_data = None
+    cover_mime = "image/jpeg"
+    cover_path_str = meta.get("cover")
+    if cover_path_str:
+        cp = Path(cover_path_str)
+        if cp.exists():
+            if cp.suffix.lower() == ".png":
+                cover_mime = "image/png"
+            with open(cp, "rb") as f:
+                cover_data = f.read()
+
     with ThreadPoolExecutor(max_workers=max_workers) as executor:
         futures = {
             executor.submit(
@@ -280,6 +298,8 @@ def run_batch_conversion(
                 audio_settings=audio_settings,
                 threads=0,
                 progress_callback=progress_callback,
+                cover_data=cover_data,
+                cover_mime=cover_mime,
             ): idx
             for idx, entry in enumerate(entries)
         }