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-rw-r--r--gallery_dl/downloader/ytdl.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/gallery_dl/downloader/ytdl.py b/gallery_dl/downloader/ytdl.py
index adada75..87e7756 100644
--- a/gallery_dl/downloader/ytdl.py
+++ b/gallery_dl/downloader/ytdl.py
@@ -89,6 +89,11 @@ class YoutubeDLDownloader(DownloaderBase):
formats = info_dict.get("requested_formats")
if formats and not compatible_formats(formats):
info_dict["ext"] = "mkv"
+ elif "ext" not in info_dict:
+ try:
+ info_dict["ext"] = info_dict["formats"][0]["ext"]
+ except LookupError:
+ info_dict["ext"] = "mp4"
if self.outtmpl:
self._set_outtmpl(ytdl_instance, self.outtmpl)