Merge pull request #427 from pumpkinperson996/fix/youtube-format-not-available

fix(youtube): 修复 YouTube 笔记生成失败 "Requested format is not available"

backend/app/downloaders/bilibili_dm_patch.py

@@ -58,12 +58,15 @@ def apply_bilibili_dm_img_patch() -> bool:
     if getattr(original, '_bili_dm_patched', False):
         return True
 
-    def _patched_download_playinfo(self, bvid, cid, headers=None, query=None):
+    def _patched_download_playinfo(self, bvid, cid, headers=None, query=None, **kwargs):
         # dm_* are merged into the query that the original method signs via
         # _sign_wbi; caller-supplied query params (e.g. try_look/qn) take
         # precedence over the injected dummies.
+        # **kwargs stays open on purpose: yt-dlp keeps adding parameters to
+        # _download_playinfo (2026.x added `fatal`), and a wrapper that pins the
+        # signature turns every such addition into a TypeError at download time.
         merged_query = {**build_dm_img_params(), **(query or {})}
-        return original(self, bvid, cid, headers=headers, query=merged_query)
+        return original(self, bvid, cid, headers=headers, query=merged_query, **kwargs)
 
     _patched_download_playinfo._bili_dm_patched = True
     BilibiliBaseIE._download_playinfo = _patched_download_playinfo

backend/app/downloaders/youtube_downloader.py

@@ -55,6 +55,10 @@ class YoutubeDownloader(Downloader, ABC):
 
         if skip_download:
             ydl_opts['skip_download'] = True
+            # 只取元信息时并不需要媒体流。yt-dlp 版本落后于 YouTube player 时，
+            # nsig 解析失败会导致所有音视频格式被丢弃，此时格式选择会抛
+            # "Requested format is not available"，把一个已经拿到字幕的任务带崩。
+            ydl_opts['ignore_no_formats_error'] = True
 
         _apply_proxy(ydl_opts)
         with yt_dlp.YoutubeDL(ydl_opts) as ydl:
@@ -63,7 +67,8 @@ class YoutubeDownloader(Downloader, ABC):
             title = info.get("title")
             duration = info.get("duration", 0)
             cover_url = info.get("thumbnail")
-            ext = info.get("ext", "m4a")
+            # skip_download 时 yt-dlp 返回 ext=None，默认值不会生效，避免拼出 "xxx.None"
+            ext = info.get("ext") or "m4a"
             audio_path = os.path.join(output_dir, f"{video_id}.{ext}")
 
         return AudioDownloadResult(