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[pp/FFmpegMetadata] Use metadata stream specifier for info.json

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The old stream index specifiers would indiscriminately select any JSON
attachment, which made stuff like embedding live chat json data risky if
not impossible.

Also adds `-copy_unknown` as JSON data is "unknown" according to FFmpeg
(since it has no codec id) and thus would otherwise be rejected by
default.
This commit is contained in:
Riteo 2024-05-21 02:07:23 +02:00
parent a0d9967f68
commit 339828d777
1 changed files with 11 additions and 7 deletions
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18
yt_dlp/postprocessor/ffmpeg.py
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@ -805,15 +805,19 @@ class FFmpegMetadataPP(FFmpegPostProcessor):
write_json_file(self._downloader.sanitize_info(info, self.get_param('clean_infojson', True)), infofn)
info['infojson_filename'] = infofn
old_stream, new_stream = self.get_stream_number(info['filepath'], ('tags', 'mimetype'), 'application/json')
if old_stream is not None:
yield ('-map', f'-0:{old_stream}')
new_stream -= 1
escaped_name = self._ffmpeg_filename_argument(infofn)
yield (
'-attach', self._ffmpeg_filename_argument(infofn),
f'-metadata:s:{new_stream}', 'mimetype=application/json',
f'-metadata:s:{new_stream}', 'filename=info.json',
# In order to override any old info.json reliably we need to
# instruct FFmpeg to consider valid tracks without a codec id, like
# JSON attachments.
'-copy_unknown',
# This map operation allows us to actually replace any previous
# info.json data.
'-map', '-0:m:filename:info.json?',
'-attach', escaped_name,
f'-metadata:s:m:filename:{escaped_name}', 'mimetype=application/json',
f'-metadata:s:m:filename:{escaped_name}', 'filename=info.json',
)