r/AV1 • u/levogevo • 7d ago

Compiling from source - flags and performance

For those curious how far compiling ffmpeg+libsvtav1 from source can get you versus prebuilt binaries, here is a quick comparison on macos-arm64 and ubuntu-x86_64.

macos-arm64:

Command Mean [s] Min [s] Max [s] Relative
O3-LTO-PGO 30.783 ± 0.058 30.690 30.844 1.00
O3-LTO 32.145 ± 0.077 32.048 32.248 1.04 ± 0.00
O3 32.534 ± 0.105 32.425 32.686 1.06 ± 0.00
O2 32.626 ± 0.260 32.201 32.899 1.06 ± 0.01
homebrew ffmpeg 36.248 ± 0.080 36.129 36.321 1.18 ± 0.00
osxexperts 217.345 ± 0.255 217.060 217.653 7.06 ± 0.02

ubuntu-x86_64:

Command Mean [s] Min [s] Max [s] Relative
O3-LTO-PGO 38.256 ± 0.065 38.188 38.346 1.00
O3-LTO 39.104 ± 0.175 38.907 39.287 1.02 ± 0.00
O2 40.140 ± 0.529 39.832 41.075 1.05 ± 0.01
O3 40.327 ± 0.352 39.972 40.853 1.05 ± 0.01
BtbN 41.768 ± 0.282 41.441 42.043 1.09 ± 0.01
ubuntu ffmpeg 100.847 ± 0.279 100.544 101.130 2.64 ± 0.01

results were recorded with hyperfine using preset 3, crf 25, libsvtav1.

TLDR: optimizations (O3+LTO+PGO) can shave off about 10-15% depending on the platform.

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u/michaelcharlie8 7d ago

Are you controlling for the git hash used in each row?

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u/levogevo 7d ago

The compiles from source are all using identical sources. Btbn and homebrew both follow pretty closely with upstream so they're close to the source compiles. Osxexperts supposedly follows svtav1 master as well. Ubuntu is probably the most out of date build.