AVExtFloat         35 3rdparty/include/ffmpeg_/libavutil/intfloat_readwrite.h attribute_deprecated double av_ext2dbl(const AVExtFloat ext) av_const;
AVExtFloat         38 3rdparty/include/ffmpeg_/libavutil/intfloat_readwrite.h attribute_deprecated AVExtFloat av_dbl2ext(double d) av_const;