IssueTracker

The ffmpeg system package, which is auto deployed for cloud functions seems to not take advantage of Cloud Function's multiple CPUs (if configured) resulting in longer processing latency.

For example, deploying a function that performs a simple conversion of a PCM format wav audio files to aac/mp4 will always only utilize a single CPU. This can be easily seen by examining the function's Container CPU utilization: If configuring the function with the default single CPU, the CPU util will be 100% for the duration of the Ffmpeg execution. If configuring the function with the 2 CPUs, the CPU util will be 50% for the duration of the Ffmpeg execution. If configuring the function with the 4 CPUs, the CPU util will be 25% for the duration of the Ffmpeg execution. The duration of processing a set audio file will remain the same no matter how many CPUs are configured.

The root cause might be that the ffmpeg build used by Cloud Functions is not built with the --enable-pthreads build option but this also may be an issue with the build specific codec libraries used by ffmpeg.

This is the ffmpeg build info for the system package (no --enable-pthreads):

ffmpeg version 4.4.2-0ubuntu0.22.04.1+esm3 Copyright (c) 2000-2021 the FFmpeg developers
built with gcc 11 (Ubuntu 11.4.0-1ubuntu1~22.04)
configuration: --prefix=/usr --extra-version=0ubuntu0.22.04.1+esm3 --toolchain=hardened 
--libdir=/usr/lib/x86_64-linux-gnu --incdir=/usr/include/x86_64-linux-gnu 
--arch=amd64 --enable-gpl --disable-stripping --enable-gnutls --enable-ladspa 
--enable-libaom --enable-libass --enable-libbluray --enable-libbs2b --enable-libcaca 
--enable-libcdio --enable-libcodec2 --enable-libdav1d --enable-libflite 
--enable-libfontconfig --enable-libfreetype --enable-libfribidi --enable-libgme 
--enable-libgsm --enable-libjack --enable-libmp3lame --enable-libmysofa 
--enable-libopenjpeg --enable-libopenmpt --enable-libopus --enable-libpulse 
--enable-librabbitmq --enable-librubberband --enable-libshine --enable-libsnappy 
--enable-libsoxr --enable-libspeex --enable-libsrt --enable-libssh --enable-libtheora 
--enable-libtwolame --enable-libvidstab --enable-libvorbis --enable-libvpx 
--enable-libwebp --enable-libx265 --enable-libxml2 --enable-libxvid --enable-libzimg 
--enable-libzmq --enable-libzvbi --enable-lv2 --enable-omx --enable-openal 
--enable-opencl --enable-opengl --enable-sdl2 --enable-pocketsphinx --enable-librsvg 
--enable-libmfx --enable-libdc1394 --enable-libdrm --enable-libiec61883 
--enable-chromaprint --enable-frei0r --enable-libx264 --enable-shared
libavutil 56. 70.100 / 56. 70.100
libavcodec 58.134.100 / 58.134.100
libavformat 58. 76.100 / 58. 76.100
libavdevice 58. 13.100 / 58. 13.100
libavfilter 7.110.100 / 7.110.100
libswscale 5. 9.100 / 5. 9.100
libswresample 3. 9.100 / 3. 9.100
libpostproc 55. 9.100 / 55. 9.100