EBU colour bars 100/75 for PAL and SMPTE color bars for NTSC - FFMpeg test pattern generation - straight to screen
#PAL100
ffmpeg -re -f lavfi -i pal100bars=rate=25 -f lavfi -i "sine=frequency=1000:sample_rate=48000" -ac 2 \
-vf "scale=720:576" -pix_fmt yuv420p -colorspace bt470bg -color_primaries bt470bg -color_trc gamma28 \
-c:v rawvideo -c:a pcm_s16le -f nut - | ffplay -fs -
#PAL75
ffmpeg -re -f lavfi -i pal75bars=rate=25 -f lavfi -i "sine=frequency=1000:sample_rate=48000" -ac 2 \
-vf "scale=720:576" -pix_fmt yuv420p -colorspace bt470bg -color_primaries bt470bg -color_trc gamma28 \
-c:v rawvideo -c:a pcm_s16le -f nut - | ffplay -fs -
#NTSC
ffmpeg -re -f lavfi -i smptebars=rate=30000/1001 -f lavfi -i "sine=frequency=1000:sample_rate=48000" -ac 2 \
-vf "scale=720:480" -pix_fmt yuv420p -colorspace smpte170m -color_primaries smpte170m -color_trc smpte170m \
-c:v rawvideo -c:a pcm_s16le -f nut - | ffplay -fs -