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lavf/avformat: add av_warn_unused_result to avformat_write_header
May be useful as a defense, see e.g c62d1780ff
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Signed-off-by: Ganesh Ajjanagadde <gajjanagadde@gmail.com>
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@ -2283,6 +2283,7 @@ void avformat_close_input(AVFormatContext **s);
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*
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* @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
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*/
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av_warn_unused_result
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int avformat_write_header(AVFormatContext *s, AVDictionary **options);
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/**
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