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ffmpeg-hololens2's Introduction

FFmpeg Libs for Hololens2

Basics

  • Hololens2 runs on UWP(Universal Windows Platform, or Windows Store standard) ARM64
  • ffmpeg libs can be compiled against UWP ARM64 for Hololens2, and x64 for Hololens2 Emulator
  • This repo used Msys2 and VS2019 to compile
  • ffmpeg is free to use(LGPL license) but x264 is not

Prebuilt

Compile

1. Install vs2019

  • Enable C++
  • Enable Universal Windows Platform

2. Setup Msys2

  • Download and install Msys2. Download exe
  • [Important] Edit msys2_shell.cmd to remove rem before set MSYS2_PATH_TYPE=inherit. So that msys cmd will inherit path when called.
  • In cmd.exe, open x64 version of Msys2, and install tools 
     // In cmd.exe
 "C:\msys64\msys2_shell.cmd" -mingw64
 
 // In shell
 pacman -S mingw-w64-x86_64-toolchain nasm
 // Press return to select ALL

3. Confirm Compile Tools

  • In cmd.exe, call vs2019's compile prompt tool vcvarsall.bat. For example: 
     // In cmd.exe
 "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x86_amd64 uwp
 // vs environment will be setup

 // call shell
 "C:\msys64\msys2_shell.cmd" -mingw64 --login

 // In shell
 which cl link nasm cpp
 // all should be found
 // cl and link should come from vs2019

4. Compile

  • Edit MSYS2_SHELL in BuildFFmpegUniversal.bat, for example:

     set MSYS2_SHELL=C:\msys64\msys2_shell.cmd

  • Open cmd.exe, goto this repo, run BuildFFmpegUniversal.bat

  • FYI:

    • BuildFFmpegUniversal.bat calls FFmpegUniversal\BuildFFmpegUniversalInternal.bat, which setup vs2019, call shell and runs BuildFFmpeg.sh.
    • If something fails in the middle, you can setup vs2019 and run BuildFFmpeg.sh in you own cmd.exe and shell (Section 5).
    • The old versions setup folder in FFmpeg (for example Output/Windows10/x64) and run ../../../../FFmpeg/configure. It somehow generate 'src/libavdevice/alldevices.cnot found error. So I run./configure` directly from FFmpeg's root folder.

5. Compile step by step (if Section 4 failed)

  • In cmd.exe, enable vs2019 
     "C:\Program Files (x86)\Microsoft Visual Studio\2019\Community\VC\Auxiliary\Build\vcvarsall.bat" x86_amd64 uwp
  • call shell 
     "C:\msys64\msys2_shell.cmd" -mingw64 --login
  • run build.sh 
     // static ARM64
 ./FFmpegUniversal/BuildFFmpeg.sh Static ARM64
 // or shared x64
 ./FFmpegUniversal/BuildFFmpeg.sh Shared x64

Reference

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