NTSC               73 libavdevice/bktr.c #define VIDEO_FORMAT NTSC
NTSC              153 libavdevice/bktr.c     case NTSC:  h_max = NTSC_HEIGHT;  c = BT848_IFORM_F_NTSCM;    break;
NTSC              282 libavdevice/bktr.c             format = NTSC;