Jointly signalling whether each of the directions should be skipped

subset1:
           RATE (%) DSNR (dB)
    PSNR -0.0609499 0.00364128
 PSNRHVS -0.0845392 0.00576046
    SSIM -0.0620935 0.00300164
FASTSSIM -0.0871825 0.00281497

video1-short:
           RATE (%)  DSNR (dB)
    PSNR -0.02604  0.00133
 PSNRHVS -0.02885  0.00214
    SSIM -0.00334  0.00015
FASTSSIM 0.02953  -0.00168