ff_framesync_request_frame   77 libavfilter/dualinput.c     return ff_framesync_request_frame(&s->fs, outlink);
ff_framesync_request_frame  294 libavfilter/framesync.h int ff_framesync_request_frame(FFFrameSync *fs, AVFilterLink *outlink);
ff_framesync_request_frame  278 libavfilter/vf_mergeplanes.c     return ff_framesync_request_frame(&s->fs, outlink);