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-rw-r--r--yt_dlp/postprocessor/ffmpeg.py4
1 files changed, 2 insertions, 2 deletions
diff --git a/yt_dlp/postprocessor/ffmpeg.py b/yt_dlp/postprocessor/ffmpeg.py
index 67daf4424..c3b9ac7fa 100644
--- a/yt_dlp/postprocessor/ffmpeg.py
+++ b/yt_dlp/postprocessor/ffmpeg.py
@@ -1149,9 +1149,9 @@ class FFmpegConcatPP(FFmpegPostProcessor):
if len(in_files) < len(entries):
raise PostProcessingError('Aborting concatenation because some downloads failed')
- ie_copy = self._downloader._playlist_infodict(info)
exts = traverse_obj(entries, (..., 'requested_downloads', 0, 'ext'), (..., 'ext'))
- ie_copy['ext'] = exts[0] if len(set(exts)) == 1 else 'mkv'
+ ie_copy = collections.ChainMap({'ext': exts[0] if len(set(exts)) == 1 else 'mkv'},
+ info, self._downloader._playlist_infodict(info))
out_file = self._downloader.prepare_filename(ie_copy, 'pl_video')
files_to_delete = self.concat_files(in_files, out_file)