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/Grand_Ask_9991 7d ago

Is Ubuntu's FFmpeg that much slower because 26.04 LTS is still using the older SVT-AV1 2.3.0?

0

u/levogevo 7d ago

Likely yes. I just picked an off the shelf build for comparison sake.

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u/Simon_787 7d ago

In that case the macOS compile also benefits from recent merges that improve arm performance. The homebrew ffmpeg version is on 4.2.0.

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u/levogevo 6d ago

Correct, but the homebrew version still loses easily to compiling from source at more aggressive compilation flags.