rav1e.md

rav1e --rdo-lookahead-frames

Motivation:

Make fastest speed setting even faster with reasonable trade-off

Benchmarks:

Default lookahead value: 40

Speed: 10

lookahead value	time diff	bd-rate diff	AWCY link
30	~-2%	~0.3%	Link
20	~-6.5%	~0.6%	Link
10	~-12%	~1.2%	Link

In addition I run long sequence to see how low rdo-lookahed will behave on long sequence.

Source:

Sample of youtube video, first scene on the beach.

1080p 60fps 10 bit 360 frames

Commands:

rav1e -s 10 --threads 1

rav1e -s 10 --threads 1 --rdo-lookagead-frames 10

Results in time:

1045s|837s 20% time decrease.

In addition to that total memory consumption of low rdo lookahead was half the default