[FFmpeg-trac] #11341(undetermined:new): Fre:ac’s OPUS encoding outperforms FFmpeg by an order of magnitude

[FFmpeg]

#11341: Fre:ac’s OPUS encoding outperforms FFmpeg by an order of magnitude
-------------------------------------+-------------------------------------
             Reporter:  Iver Jordal  |                     Type:
                                     |  enhancement
               Status:  new          |                 Priority:  normal
            Component:               |                  Version:
  undetermined                       |  unspecified
             Keywords:               |               Blocked By:
  performance, OPUS                  |
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 Summary of the issue:
 When encoding a 1-hour 48 kHz mono WAV file to OPUS, FFmpeg takes
 significantly longer than fre:ac under similar conditions. Even with
 standard settings, fre:ac is faster than FFmpeg’s libopus encoding, and
 using the --superfast option in fre:ac results in roughly a 10x speed
 improvement on my PC. This issue is not related to a specific version of
 ffmpeg - I tried ffmpeg v4, v5, v6 and v7. I used a modern nVME SSD and
 Intel i7-13700HX on Windows 11 during benchmarking, but I believe the
 issue applies to other storage devices, CPUs and operating systems as
 well.

 How to reproduce:

 FFmpeg (libopus @ 96k, execution time: ~19.1s):

 {{{
 ffmpeg -nostdin -n -i 1hourmono_48khz.wav -vn -c:a libopus -b:a 96K -ar
 48000 -dash 1 -f opus output_ffmpeg_libopus.opus
 }}}


 fre:ac (opus @ 96k, standard, execution time: ~12.3s):

 {{{
 .\freaccmd.exe -o "output_freac.opus" --encoder=opus -- --bitrate 96
 "1hourmono_48khz.wav"
 }}}

 fre:ac (opus @ 96k, superfast, execution time: ~1.66s):

 {{{
 .\freaccmd.exe -o "output_freac_superfast.opus" --encoder=opus --superfast
 -- --bitrate 96 "1hourmono_48khz.wav"
 }}}

 Patches should be submitted to the ffmpeg-devel mailing list and not this
 bug tracker.
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/11341>
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