PF                370 libavfilter/vf_decimate.c #define PF(suf)         PF_NOALPHA(suf), PF_ALPHA(suf)
PF                266 libavfilter/vf_psnr.c #define PF(suf)         PF_NOALPHA(suf), PF_ALPHA(suf)
PF                368 libavfilter/vf_ssim.c #define PF(suf) AV_PIX_FMT_YUV420##suf,  AV_PIX_FMT_YUV422##suf,  AV_PIX_FMT_YUV444##suf, AV_PIX_FMT_GBR##suf