feat: set MKV internal title to "Artist - Concert (year)"

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

downloader.py

@@ -198,6 +198,10 @@ class DownloadManager:
             versions = get_versions(pid_m.group(1))
             lang_tag = select_lang_tag(versions)
 
+        # MKV internal title: "Artist - Concert Title (year)"
+        name_part = f"{title} - {subtitle}" if subtitle else title
+        mkv_title = f"{name_part} ({year})" if year else name_part
+
         # For HLS, yt-dlp downloads video then audio separately.
         # After the first stream finishes, stay in "processing" to avoid
         # resetting progress to 0% when the audio stream starts.
@@ -219,10 +223,13 @@ class DownloadManager:
                 finished_once[0] = True
                 self._set(dl_id, state="processing", progress=100)
 
+        ffmpeg_out = ["-metadata", f"title={mkv_title}"]
+
         ydl_opts = {
             "outtmpl": f"{out_dir}/%(title)s.%(ext)s",
             "format": "bestvideo[vcodec^=avc1]+bestaudio/bestvideo+bestaudio/best",
             "merge_output_format": "mkv",
+            "postprocessor_args": {"ffmpeg_o": ffmpeg_out},
             "progress_hooks": [hook],
             "quiet": True,
             "no_warnings": True,
@@ -232,9 +239,9 @@ class DownloadManager:
                 "writesubtitles": True,
                 "subtitleslangs": ["fr"],
                 "embedsubtitles": True,
-                # Set first subtitle track as default in MKV
-                "postprocessor_args": {"ffmpeg_o": ["-disposition:s:0", "default"]},
             })
+            # Append disposition after title metadata
+            ffmpeg_out += ["-disposition:s:0", "default"]
 
         try:
             with yt_dlp.YoutubeDL(ydl_opts) as ydl: