EXT_STOP           53 libavfilter/dualinput.c     in[0].before = EXT_STOP;
EXT_STOP           60 libavfilter/dualinput.c         in[0].after = in[1].after = EXT_STOP;
EXT_STOP          156 libavfilter/framesync.c                     fs->in[i].after == EXT_STOP)
EXT_STOP          165 libavfilter/framesync.c                      fs->in[i].before == EXT_STOP))
EXT_STOP          233 libavfilter/vf_mergeplanes.c         in[i].before = EXT_STOP;
EXT_STOP          234 libavfilter/vf_mergeplanes.c         in[i].after  = EXT_STOP;