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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 97f04d116..53e292015 100644
--- a/yt_dlp/postprocessor/ffmpeg.py
+++ b/yt_dlp/postprocessor/ffmpeg.py
@@ -775,7 +775,7 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
stream_idx = 0
for fmt in info.get('requested_formats') or []:
stream_count = 2 if 'none' not in (fmt.get('vcodec'), fmt.get('acodec')) else 1
- lang = ISO639Utils.short2long(fmt['language']) or fmt.get('language')
+ lang = ISO639Utils.short2long(fmt.get('language') or '') or fmt.get('language')
for i in range(stream_idx, stream_idx + stream_count):
if lang:
metadata[str(i)].setdefault('language', lang)