MONO_R            186 libavfilter/vf_stereo3d.c     { "mr",    "mono right",                          0, AV_OPT_TYPE_CONST, {.i64=MONO_R},             0, 0, FLAGS, "out" },
MONO_R            441 libavfilter/vf_stereo3d.c     case MONO_R:
MONO_R            569 libavfilter/vf_stereo3d.c     case MONO_R: