diff --git a/downloader.py b/downloader.py
index 83481cc..1e4ad56 100644
--- a/downloader.py
+++ b/downloader.py
@@ -269,7 +269,10 @@ class DownloadManager:
             ydl_opts.update({
                 "writesubtitles": True,
                 "subtitleslangs": ["fr"],
-                "embedsubtitles": True,
+                # embedsubtitles:True is CLI-only — must register the postprocessor explicitly
+                "postprocessors": [
+                    {"key": "FFmpegEmbedSubtitle", "already_have_subtitle": False},
+                ],
             })
             # "embedsubtitle+ffmpeg_o" sets title + default disposition during subtitle embed
             ydl_opts["postprocessor_args"]["embedsubtitle+ffmpeg_o"] = (