build ffmpeg for ios

build-ffmpeg-for-ios.md

Please just read the project https://github.com/kewlbear/FFmpeg-iOS-build-script

Prepare some tools

• gas-preprocessor

  https://github.com/libav/gas-preprocessor

• yasm tool

    brew install yasm
  

• build script

  https://github.com/kewlbear/FFmpeg-iOS-build-script

Compile

https://github.com/kewlbear/FFmpeg-iOS-build-script

Issues

• GASPP_FIX_XCODE5

Clang from Xcode5 supports bsl/saddl2? only in an unofficial assembler syntax. To avoid breakage with later versions or different assembler gas-preprocessor.pl checks for the environment variable GASPP_FIX_XCODE5 before changing these instructions to the non-standard syntax.

https://git.libav.org/?p=gas-preprocessor.git;a=commitdiff;h=940274b97c669e1d19a3f2fed186675354f67f40

Something else

arm architecture for all ios devices

https://www.innerfence.com/howto/apple-ios-devices-dates-versions-instruction-sets