compiling ffmpeg for Mac OSX High Sierra 10.13

[martin]

Hello I made an electron app that uses ffmpeg to combine audio and renders video, it works fine on windows, linux, and modern mac osx computers, but a user has reported to me that on an older version of mac osx such as High Sierra 10.13, the way that I have setup ffmpeg does not work.

I have a virtual machine with High Sierra v10.13 where I install RenderTune-mac.dmg from my releases page[1], then I download 2 audio files and the image from [this link][2]. I open RenderTune, and try render a video. My command to combine the audio files into a single mp3 works fine, but when I try to combine that mp3 with the image file, the ffmpeg build I have packaged with my electron app fails with this error:
`
Command was killed with SIGABRT (Aborted): /Applications/RenderTune.app/Contents/Resources/ffmpeg -loop 1 -framerate 2 -i /Users/martin/Downloads/R-3777978-1344032418-8379.jpeg.jpg -i /Users/martin/Downloads/output-871140.mp3 -y -acodec copy -b:a 320k -vcodec libx264 -b:v 8000k -maxrate 8000k -minrate 8000k -bufsize 3M -filter:v scale=w=1920:h=1954 -preset medium -tune stillimage -crf 18 -pix_fmt yuv420p -shortest /Users/martin/Downloads/concatVideo-871140.mp4
ffmpeg version git-2021-03-24-13335df Copyright (c) 2000-2021 the FFmpeg developers

built with Apple LLVM version 10.0.1 (clang-1001.0.46.4)
configuration: --pkgconfigdir=/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace/lib/pkgconfig --prefix=/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace --pkg-config-flags=--static --extra-cflags='-I/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace/include -mmacosx-version-min=10.10' --extra-ldflags='-L/Users/martinbarker/Documents/projects/rendertune-0.5.0/workspace/lib -mmacosx-version-min=10.10' --extra-libs='-lpthread -lm' --enable-static --disable-securetransport --disable-debug --disable-shared --disable-ffplay --disable-lzma --disable-doc --enable-version3 --enable-pthreads --enable-runtime-cpudetect --enable-avfilter --enable-filters --disable-libxcb --enable-gpl --enable-nonfree --disable-libass --enable-libfdk-aac --enable-libmp3lame --enable-libx264
libavutil 56. 66.100 / 56. 66.100
libavcodec 58.128.100 / 58.128.100
libavformat 58. 69.100 / 58. 69.100
libavdevice 58. 12.100 / 58. 12.100
libavfilter 7.107.100 / 7.107.100
libswscale 5. 8.100 / 5. 8.100
libswresample 3. 8.100 / 3. 8.100
libpostproc 55. 8.100 / 55. 8.100

Input #0, image2, from '/Users/martin/Downloads/R-3777978-1344032418-8379.jpeg.jpg':

Duration: 00:00:00.50, start: 0.000000, bitrate: 1758 kb/s
Stream #0:0: Video: mjpeg (Progressive), yuvj444p(pc, bt470bg/unknown/unknown), 590x600 [SAR 1:1 DAR 59:60], 2 fps, 2 tbr, 2 tbn, 2 tbc

Input #1, mp3, from '/Users/martin/Downloads/output-871140.mp3':

Metadata:

title : My Little Grass Shack
album : Our Hawaii - A Collection Of Personal Favorites
artist : Society Of Seven
track : 11
encoder : Lavf58.69.100

Duration: 00:06:25.59, start: 0.025057, bitrate: 320 kb/s
Stream #1:0: Audio: mp3, 44100 Hz, stereo, fltp, 320 kb/s

Metadata:

encoder : Lavc58.12

Stream mapping:

Stream #0:0 -> #0:0 (mjpeg (native) -> h264 (libx264))
Stream #1:0 -> #0:1 (copy)

Press [q] to stop, ? for help
[swscaler @ 0x7fbad9167600] deprecated pixel format used, make sure you did set range correctly
[libx264 @ 0x7fbad9040400] using SAR=2681/2679
dyld: lazy symbol binding failed: Symbol not found: chkstk_darwin

Referenced from: /Applications/RenderTune.app/Contents/Resources/ffmpeg
Expected in: /usr/lib/libSystem.B.dylib

dyld: Symbol not found: chkstk_darwin

Referenced from: /Applications/RenderTune.app/Contents/Resources/ffmpeg
Expected in: /usr/lib/libSystem.B.dylib

at makeError (/Applications/Render…eca/lib/error.js:59)
at handlePromise (/Applications/Render…/execa/index.js:114)
at async file:/Applicat…js/newindex.js:1323

`

These files will render fine on windows/linux and recent mac versions. In order to package ffmpeg in my electron app on mac computers I had to build a custom sandboxed version with no dynamically linked libraries. I have a .sh file that automatically downloads ffmpeg and builds it with all the necessary flags for mac computers.
​https://github.com/MartinBarker/RenderTune/blob/master/buildffmpeg.sh[3]
Inside this .sh file is where I compile ffmpeg using these flags :
`
./configure \

--pkgconfigdir="$WORKSPACE/lib/pkgconfig" \
--prefix=${WORKSPACE} \
--pkg-config-flags="--static" \
--extra-cflags="-I$WORKSPACE/include -mmacosx-version-min=${MACOS_MIN}" \
--extra-ldflags="-L$WORKSPACE/lib -mmacosx-version-min=${MACOS_MIN}" \
--extra-libs="-lpthread -lm" \

--enable-static \
--disable-securetransport \
--disable-debug \
--disable-shared \
--disable-ffplay \
--disable-lzma \
--disable-doc \
--enable-version3 \
--enable-pthreads \
--enable-runtime-cpudetect \
--enable-avfilter \
--enable-filters \
--disable-libxcb \
--enable-gpl \
--enable-nonfree \
--disable-libass \
--enable-libfdk-aac \
--enable-libmp3lame \
--enable-libx264

`

If I try to run this script in my High Sierra VM, it fails with this message:

Unknown option "-extra-libs=-lpthread"

if I remove that flag it fails with a different message:

Unknown option "--enable-static"

I need this flag in order to release my electron app on the mac apple store, can anyone help me compile a static version of ffmpeg that works on old versions like High Sierra 10.13 as well as works on modern mac os systems?

[1]: ​https://github.com/MartinBarker/RenderTune/releases/tag/v1.0.1
[2]: ​https://mega.nz/folder/lm4wRIiS#Nnq7jWi_a2RQ1SjM6yaRpg
[3]: ​http://buildffmpeg.sh