| vcodec |
libx264 |
use libx264 for H.264 video encoding |
| b |
668000 |
default to fmt_std video bitrate |
| coder |
1 |
CABAC enabled |
| trellis |
1 |
trellis decisions enabled in the final encode of a master block. requires CABAC |
| flags |
+loop |
enable loop filter (same as default) |
| cmp |
+chroma |
enable chroma subpixel refinement |
| partitions |
+parti8x8+parti4x4+partp8x8+partb8x8 |
I-macroblocks at 4×4 and 8×8 partitions. P-macroblocks at 8×8 partitions. B-macroblocks at 8×8 partitions. i8x8 requires dct8x8, creating High Profile |
| me_method |
umh |
unsymmetric cross multi-hexagon grid motion estimation search |
| me_range |
16 |
motion search at 16 motion vectors (same as default) |
| rc_eq |
‘blurCplx^(1-qComp)’ |
ratecontrol equation |
| qcomp |
0.6 |
quantizer compression |
| qdiff |
4 |
maximum difference between the quantizer scale steps |
| qmin |
10 |
minimum difference between the quantizer scale |
| qmax |
51 |
maximum difference between the quantizer scale |
| g |
250 |
keyframe interval, a.k.a. group of picture length. maximum distance between I-frames |
| keyint_min |
25 |
minimum group of picture size. minimum distance between I-frames |
| sc_threshold |
40 |
scene change detection threshold |
| i_qfactor |
0.71 |
quantizer scale difference between I-frames and P-frames |
| b_strategy |
2 |
slowest, most accurate B-frame decision mode used for two-pass encoding |
| bf |
3 |
limit the number of consequtive B-frames for compatibility across a broad range of playback devices |
| refs |
4 |
reference frames to consider for motion compensation. limit for decoded picture buffer compatibility |
| directpred |
3 |
automatically choose between spatial and temporal prediction mode for B-frames |
| flags2 |
+wpred+mixed_refs+dct8x8+fastpskip+mbtree’ |
allow B-frames to use non-default weighted prediction. allow different references for each p8x8 block. high-profile 8×8 transform. full analysis on all P-blocks. use macroblock tree ratecontrol |
| wpredp |
2 |
weighted prediction smart weighting (full fade detection analysis) |
