Opened 10 hours ago
Last modified 9 hours ago
#11408 new enhancement
loudnorm performance improvement
| Reported by: | guillaumekh | Owned by: | |
|---|---|---|---|
| Priority: | minor | Component: | avfilter |
| Version: | git-master | Keywords: | loudnorm loudness performance ebur128 |
| Cc: | Blocked By: | ||
| Blocking: | Reproduced by developer: | no | |
| Analyzed by developer: | no |
Description (last modified by )
Summary of the bug:
The loudnorm audio filter is slow.
On my M2 Max MacBook Pro running FFmpeg 7.1, it typically reaches 25-35x speed.
Some other ITU1770 implementations manage better throughput. I’m currently aware of the following implementations:
- libebur128 (C library): similar to FFmpeg's loudnorm
- ebur128 (Rust port of libebur128): reportedly only moderately faster than libebur128 according to authors
- bs1770gain: ≈100x faster than realtime
- Adobe Audition: takes the crown, at ≈275x faster than realtime
How to reproduce:
% ffmpeg -i sometestaudiofile -vn -af loudnorm -f null /dev/null
Patches should be submitted to the ffmpeg-devel mailing list and not this bug tracker.
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