ff_framesync_add_frame  300 libavfilter/framesync.c     if ((ret = ff_framesync_add_frame(fs, FF_INLINK_IDX(inlink), in)) < 0)
ff_framesync_add_frame  322 libavfilter/framesync.c         if ((ret = ff_framesync_add_frame(fs, input, NULL)) < 0)
ff_framesync_add_frame  244 libavfilter/framesync.h int ff_framesync_add_frame(FFFrameSync *fs, unsigned in, AVFrame *frame);