[FFmpeg-trac] #9923(ffmpeg:new): hls has low CPU utilization

[FFmpeg]

#9923: hls has low CPU utilization
-------------------------------------+-------------------------------------
             Reporter:  vidbin       |                     Type:  defect
               Status:  new          |                 Priority:  minor
            Component:  ffmpeg       |                  Version:  git-
             Keywords:  hls cpu      |  master
  utilization                        |               Blocked By:
             Blocking:               |  Reproduced by developer:  0
Analyzed by developer:  0            |
-------------------------------------+-------------------------------------
 When using HLS CPU usage is reduced by up to 2/3rd.

 Using a three minute 1440p60 video:

 {{{
 ffmpeg -i /root/1440p.mkv -y -acodec aac -vcodec libsvtav1 -threads 24 -f
 mp4 -movflags faststart -max_muxing_queue_size 1024 -map_metadata -1
 -pix_fmt yuv420p -b:a 192k -ac 2 -vf scale=w=-2:h=1080 -crf 42 -preset 7
 -g 999 /root/output-1080p-fragmented.mp4
 }}}

 CPU utilization is 2000%-2200%

 However, using the below command is only 700% CPU utilization:


 {{{
 ffmpeg -i /root/1ea4267d-37e3-4d40-bb92-124dd8faf1a6-1440-fragmented.mp4
 -y -acodec aac -vcodec libsvtav1 -threads 24 -f mp4 -movflags faststart
 -max_muxing_queue_size 1024 -map_metadata -1 -pix_fmt yuv420p -b:a 192k
 -ac 2 -vf scale=w=-2:h=1080 -crf 42 -preset 7 -g 999 -hls_time 4
 -hls_list_size 0 -hls_playlist_type vod -hls_segment_filename
 /root/1080-fragmented.mp4 -hls_segment_type fmp4 -f hls -hls_flags
 single_file /root/1080.m3u8
 }}}

 I'm trying on a later ffmpeg build and have the same issue.

 {{{
 ffmpeg version git-2022-09-10-c92edd9 Copyright (c) 2000-2022 the FFmpeg
 developers
   built with gcc 10 (Debian 10.2.1-6)
   configuration: --enable-gpl --enable-version3 --enable-gnutls --enable-
 static --disable-debug --disable-ffplay --cc=gcc --enable-fontconfig
 --enable-gray --enable-libaom --enable-libopus --enable-libvpx --enable-
 libsvtav1 --enable-libx264
   libavutil      57. 36.101 / 57. 36.101
   libavcodec     59. 42.104 / 59. 42.104
   libavformat    59. 30.101 / 59. 30.101
   libavdevice    59.  8.101 / 59.  8.101
   libavfilter     8. 48.100 /  8. 48.100
   libswscale      6.  8.108 /  6.  8.108
   libswresample   4.  9.100 /  4.  9.100
   libpostproc    56.  7.100 / 56.  7.100
 Hyper fast Audio and Video encoder
 }}}
-- 
Ticket URL: <https://trac.ffmpeg.org/ticket/9923>
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