extern AVInputFormat ff_image_pcx_pipe_demuxer;
extern AVInputFormat ff_image_pgmyuv_pipe_demuxer;
extern AVInputFormat ff_image_pgm_pipe_demuxer;
extern AVInputFormat ff_image_pcx_pipe_demuxer;
extern AVInputFormat ff_image_pgmyuv_pipe_demuxer;
extern AVInputFormat ff_image_pgm_pipe_demuxer;