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-rw-r--r--yt_dlp/postprocessor/ffmpeg.py2
1 files changed, 1 insertions, 1 deletions
diff --git a/yt_dlp/postprocessor/ffmpeg.py b/yt_dlp/postprocessor/ffmpeg.py
index 6fe1b6cdd..d909149ef 100644
--- a/yt_dlp/postprocessor/ffmpeg.py
+++ b/yt_dlp/postprocessor/ffmpeg.py
@@ -1151,7 +1151,7 @@ class FFmpegConcatPP(FFmpegPostProcessor):
entries = info.get('entries') or []
if not any(entries) or (self._only_multi_video and info['_type'] != 'multi_video'):
return [], info
- elif traverse_obj(entries, (..., 'requested_downloads', lambda _, v: len(v) > 1)):
+ elif traverse_obj(entries, (..., lambda k, v: k == 'requested_downloads' and len(v) > 1)):
raise PostProcessingError('Concatenation is not supported when downloading multiple separate formats')
in_files = traverse_obj(entries, (..., 'requested_downloads', 0, 'filepath')) or []