Již bylo v prvním příspěvku
ffmpeg -i ... -preset X -crf 30 -c:a aac -movflags -c:v libx264 -pix_fmt yuv420p faststart output.mp4
X jsou varianty : { slower, medium}
Výpis z ffmpeg (shrnutí po konci konverze - zjiného videa, z každého řádku smazáno [libx264 @ 00000073a2691680] )
SLOWER
profile Progressive High, level 5.0, 4:2:0, 8-bit
frame I:1 Avg QP:22.33 size: 28281
frame P:31 Avg QP:23.16 size: 4042
frame B:58 Avg QP:27.17 size: 562
consecutive B-frames: 12.2% 2.2% 10.0% 75.6%
mb I I16..4: 23.2% 11.1% 65.8%
mb P I16..4: 1.5% 0.9% 0.4% P16..4: 33.1% 12.8% 9.7% 0.5% 0.2% skip:41.0%
mb B I16..4: 0.1% 0.0% 0.0% B16..8: 39.3% 4.2% 0.5% direct: 0.3% skip:55.6% L0:54.8% L1:40.0% BI: 5.2%
8x8 transform intra:21.4% inter:38.1%
direct mvs spatial:93.1% temporal:6.9%
coded y,uvDC,uvAC intra: 45.1% 80.3% 53.7% inter: 6.5% 9.3% 1.1%
i16 v,h,dc,p: 62% 23% 13% 3%
i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 16% 8% 54% 3% 2% 3% 2% 4% 6%
i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 29% 14% 9% 7% 7% 7% 8% 6% 12%
i8c dc,h,v,p: 37% 30% 27% 7%
Weighted P-Frames: Y:0.0% UV:0.0%
ref P L0: 74.2% 6.9% 10.1% 4.2% 1.5% 1.3% 1.2% 0.5% 0.2%
ref B L0: 92.8% 4.5% 1.8% 0.4% 0.2% 0.2% 0.1%
ref B L1: 97.1% 2.9%
MEDIUM
profile Progressive High, level 4.0, 4:2:0, 8-bit
frame I:1 Avg QP:22.44 size: 27713
frame P:30 Avg QP:23.73 size: 4276
frame B:59 Avg QP:27.71 size: 480
consecutive B-frames: 7.8% 11.1% 10.0% 71.1%
mb I I16..4: 24.0% 11.2% 64.8%
mb P I16..4: 1.7% 1.1% 0.4% P16..4: 36.5% 17.8% 10.1% 0.0% 0.0% skip:32.3%
mb B I16..4: 0.1% 0.0% 0.0% B16..8: 33.7% 3.3% 0.3% direct: 0.3% skip:62.3% L0:55.7% L1:39.9% BI: 4.4%
8x8 transform intra:22.6% inter:46.7%
coded y,uvDC,uvAC intra: 43.3% 79.0% 52.5% inter: 7.3% 9.7% 1.1%
i16 v,h,dc,p: 55% 28% 14% 3%
i8 v,h,dc,ddl,ddr,vr,hd,vl,hu: 20% 10% 57% 2% 2% 2% 1% 2% 3%
i4 v,h,dc,ddl,ddr,vr,hd,vl,hu: 32% 19% 11% 7% 6% 7% 7% 4% 8%
i8c dc,h,v,p: 39% 28% 26% 6%
Weighted P-Frames: Y:3.3% UV:0.0%
ref P L0: 79.6% 6.3% 11.3% 2.7% 0.1%
ref B L0: 94.0% 5.5% 0.5%
ref B L1: 98.5% 1.5%
Toto je pro oba výstup stejné. Jen řádek u SLOWER JE Weighted P-Frames: Y:0.0% UV:0.0% a má řádek navíc (mvs asi zkratka pro motion vectors):
direct mvs spatial:32.7% temporal:67.3%
Něco jako mediainfo:
SLOWER / MEDIUM:
Format profile: High@L5 / High@L4
Format settings : CABAC, 8 /4 Ref Frames
ReFrames : 8/4 frames
Encoding settings:
ref=8 / 3
analyse=0x3:0x133 / 0x113
me=umh / hex
direct=3 / 1
subme=9 / 7
trellis=2 / 1
b_adapt=2 / 1
rc_lookahead=60 / 40