av_opt_ptr       2062 ffmpeg.c           frame_sample_aspect= av_opt_ptr(avcodec_get_frame_class(), decoded_frame, "sample_aspect_ratio");
av_opt_ptr        350 libavformat/dump.c     char **codec_separator = av_opt_ptr(st->codec->av_class, st->codec, "dump_separator");
av_opt_ptr        797 libavutil/opt.h void *av_opt_ptr(const AVClass *avclass, void *obj, const char *name);