x265 Parameters
Quick command line snippets for use in ffmpeg:
24 fps:
-x265-params no-open-gop=1:keyint=240:gop-lookahead=12:bframes=6:weightb=1:hme=1:strong-intra-smoothing=0:rect=0:aq-mode=4
25 fps:
-x265-params no-open-gop=1:keyint=250:gop-lookahead=12:bframes=6:weightb=1:hme=1:strong-intra-smoothing=0:rect=0:aq-mode=4
30 fps:
-x265-params no-open-gop=1:keyint=300:gop-lookahead=12:bframes=6:weightb=1:hme=1:strong-intra-smoothing=0:rect=0:aq-mode=4
50 fps:
-x265-params no-open-gop=1:keyint=500:gop-lookahead=11:bframes=7:weightb=1:hme=1:strong-intra-smoothing=0:rect=0:aq-mode=4
60 fps:
-x265-params no-open-gop=1:keyint=600:gop-lookahead=11:bframes=7:weightb=1:hme=1:strong-intra-smoothing=0:rect=0:aq-mode=4
x265 Quality Settings
Pretty much just use -crf 23.
23 is about the equivalent of 21 or 20 for x264.
x265 Parameters
Good general parameters:
aq-mode=4 — use adaptive quantization with auto-variance and edge information
no-open-gop=1 — use closed GOP
weightb=1 — enable weighted prediction in B slices
hme=1 — enable hierarchical motion estimation
strong-intra-smoothing=0
rect=0
Parameters that depend on frame rate:
| Frames per second | keyint |
bframes |
gop-lookahead |
|---|---|---|---|
| 24 | 240 | 6 | 12 |
| 25 | 250 | 6 | 12 |
| 30 | 300 | 6 | 12 |
| 50 | 500 | 7 | 11 |
| 60 | 600 | 7 | 11 |