[FFmpeg-user] High CPU utilization in FFmpeg 5.0.1 compared to FFmpeg 4.3 for all media conversions

[Kousthu Gangarapu]

Hi FFmpeg community,

After installing the latest FFmpeg 5.0.1 from 4.3, I am seeing increased
Avg CPU Utilization and increased number of threads for the same workload
compared to FFmpeg v4.3.

*Specifically,*
1. Increased Avg CPU utilization upto 15% - compared to version 4.3 for the
same workload.
2. Increase in the number of threads per ffmpeg process by 3x - compared to
version 4.3 for the same type of media conversion workload

*My query:*
1. Is this expected? If yes, any specific reason? If not, any
configuration/tuning to be done?
2. Is there a way we can tune ffmpeg to reduce the CPU & thread counts back
to v4.3 levels?

*Hardware:*
 Intel(R) Xeon(R) CPU E5-2680 v3 @ 2.50GHz / 48 CPUs
Thread(s) per core:  2
Core(s) per socket:  12
Socket(s):           2

*Command used:*
ffmpeg -y -v error -progress tcp://127.0.0.1:44477 -analyzeduration 25M
-probesize 50M -thread_queue_size 2048 -err_detect aggressive -fflags
+discardcorrupt -abort_on empty_output_stream -i udp://
1.1.1.1:9000?fifo_size=10000000&overrun_nonfatal=1 -filter_complex
[i:0x25]yadif[vout];[vout]split=4[out0][out1][out2][out3];[out0]setdar=256/144[v0];[out1]setdar=512/288[v1];[out2]setdar=1024/576[v2];[out3]setdar=1280/720[v3];[i:0x27]aresample=async=1:min_hard_comp=0.100000:first_pts=0[aout];[aout]asplit=4[a0][a1][a2][a3]
-f flv -vcodec libx264 -s 256x144 -r 25/1 -b:v 200000 -acodec libfdk_aac
-ar 48000 -b:a 32000 -sc_threshold 0 -pix_fmt yuv420p -flags
+global_header+cgop -profile:v baseline -level 3.0 -preset fast -nal-hrd
cbr -maxrate 200000 -minrate 200000 -bufsize 400000 -g 50 -map [v0] -map
[a0] rtmp://lab2.com/rtmp/push/testfeed1 -f flv -vcodec libx264 -s 512x288
-r 25/1 -b:v 500000 -acodec libfdk_aac -ar 48000 -b:a 64000 -sc_threshold 0
-pix_fmt yuv420p -flags +global_header+cgop -profile:v baseline -level 3.0
-preset fast -nal-hrd cbr -maxrate 500000 -minrate 500000 -bufsize 1000000
-g 50 -map [v1] -map [a1] rtmp://lab2.com/rtmp/push/testfeed2 -f flv
-vcodec libx264 -s 1024x576 -r 25/1 -b:v 1000000 -acodec libfdk_aac -ar
48000 -b:a 64000 -sc_threshold 0 -pix_fmt yuv420p -flags
+global_header+cgop -profile:v main -level 3.1 -preset fast -nal-hrd cbr
-maxrate 1000000 -minrate 1000000 -bufsize 2000000 -g 50 -map [v2] -map
[a2] rtmp://lab2.com/rtmp/push/testfeed3 -f flv -vcodec libx264 -s 1280x720
-r 25/1 -b:v 1800000 -acodec libfdk_aac -ar 48000 -b:a 64000 -sc_threshold
0 -pix_fmt yuv420p -flags +global_header+cgop -profile:v high -level 4.0
-preset fast -nal-hrd cbr -maxrate 1800000 -minrate 1800000 -bufsize
3600000 -g 50 -map [v3] -map [a3] rtmp://lab2.com/rtmp/push/testfeed4


*FFmpeg 4.3 version:*
 ffmpeg -version
ffmpeg version 4.3 Copyright (c) 2000-2020 the FFmpeg developers
built with gcc 8 (GCC)
configuration: --prefix=/root/ffmpeg-4.3/ffmpeg_build
--pkg-config-flags=--static
--extra-cflags='-I/root/ffmpeg-4.3/ffmpeg_build/include
-I/usr/local/cuda/include'
--extra-ldflags='-L/root/ffmpeg-4.3/ffmpeg_build/lib
-L/usr/local/cuda/lib64' --extra-libs=-lpthread --extra-libs=-lm
--bindir=/root/ffmpeg-4.3/bin --enable-gpl --enable-libfdk_aac
--enable-libfreetype --enable-libmp3lame --enable-libopus --enable-libvpx
--enable-libx264 --enable-libx265 --enable-cuda --enable-cuvid
--enable-nvenc --enable-libnpp --enable-nonfree --enable-openssl
libavutil      56. 51.100 / 56. 51.100
libavcodec     58. 91.100 / 58. 91.100
libavformat    58. 45.100 / 58. 45.100
libavdevice    58. 10.100 / 58. 10.100
libavfilter     7. 85.100 /  7. 85.100
libswscale      5.  7.100 /  5.  7.100
libswresample   3.  7.100 /  3.  7.100
libpostproc    55.  7.100 / 55.  7.100



*FFmpeg 5.0.1 version:*ffmpeg version 5.0.1 Copyright (c) 2000-2022 the
FFmpeg developers
built with gcc 8 (GCC)
configuration: --prefix=/root/ffmpeg-5.0.1-p02/ffmpeg_build
--pkg-config-flags=--static
--extra-cflags=-I/root/ffmpeg-5.0.1-p02/ffmpeg_build/include
--extra-ldflags=-L/root/ffmpeg-5.0.1-p02/ffmpeg_build/lib
--extra-libs=-lpthread --extra-libs=-lm --bindir=/root/ffmpeg-5.0.1-p02/bin
--enable-gpl --enable-libfdk_aac --enable-libfreetype --enable-libmp3lame
--enable-libopus --enable-libvpx --enable-libx264 --enable-libx265
--enable-nonfree --enable-openssl
libavutil      57. 17.100 / 57. 17.100
libavcodec     59. 18.100 / 59. 18.100
libavformat    59. 16.100 / 59. 16.100
libavdevice    59.  4.100 / 59.  4.100
libavfilter     8. 24.100 /  8. 24.100
libswscale      6.  4.100 /  6.  4.100
libswresample   4.  3.100 /  4.  3.100
libpostproc    56.  3.100 / 56.  3.100

Regards,
Kousthub