Speed Optimization

By default, top level build scripts (android.sh, ios.sh, linux.sh, macos.sh and tvos.sh) build FFmpeg optimized for size. However, there is an optional --speed flag supported by top level scripts which optimizes FFmpeg for speed.

This flag enables build optimizations that increase the speed of FFmpeg operations. Unfortunately, these optimizations also cause library size to increase too much. This is why it is not set by default.

You can see the effect of enabling --speed flag on Android in the following table.

	arm-v7a	arm-v7a-neon	arm64-v8a	x86	x86-64
default library size	10765756	10991128	10959784	12687464	13505440
library size with --speed flag	15185340	15250968	14707528	17726056	18473376
difference	+%41	+%39	+%34	+%40	+%37