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[pp/FFmpegMetadata] Avoid erroneous ISO 639 conversions (#16046)

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Closes #16045
Authored by: bashonly
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bashonly 2026-06-09 17:09:45 -05:00 committed by GitHub
parent a6791415e0
commit e85da3b985
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1 changed files with 10 additions and 1 deletions
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11
yt_dlp/postprocessor/ffmpeg.py
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@ -777,7 +777,16 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
stream_idx = 0
for fmt in info.get('requested_formats') or [info]:
stream_count = 2 if 'none' not in (fmt.get('vcodec'), fmt.get('acodec')) else 1
lang = ISO639Utils.short2long(fmt.get('language') or '') or fmt.get('language')
lang = fmt.get('language') or ''
# Avoid using ISO639Utils.short2long if `lang` is likely already a valid long code.
# Some languages have only a long code and no short code, but the language map in
# ISO639Utils only contains languages with *both* a short and long code.
# If the language doesn't have a short code, short2long will give the wrong result.
# See https://github.com/yt-dlp/yt-dlp/issues/16045
if len(lang) == 3:
lang = lang.lower()
else:
lang = ISO639Utils.short2long(lang.lower()) or lang
for i in range(stream_idx, stream_idx + stream_count):
if lang:
metadata[str(i)].setdefault('language', lang)