ff_format_output_open  126 libavformat/fifo.c     ret = ff_format_output_open(avf2, avf->url, &format_options);
ff_format_output_open  643 libavformat/internal.h int ff_format_output_open(AVFormatContext *s, const char *url, AVDictionary **options);
ff_format_output_open  298 libavformat/tee.c     ret = ff_format_output_open(avf2, filename, &options);