av_iformat_next    92 libavdevice/avdevice.c             if (!(prev = av_iformat_next(prev)))
av_iformat_next  2087 libavformat/avformat.h AVInputFormat  *av_iformat_next(const AVInputFormat  *f);
av_iformat_next    64 libavformat/options.c     while ((ifmt = av_iformat_next(ifmt)))
av_iformat_next    73 libavformat/options.c         while (ifmt = av_iformat_next(ifmt))