Static Library (prpr-avc)

Introduction

• This is the static library used by Phira for video decoding. It is compiled from FFmpeg commit hash 4a80db5fc2b1b134550ffbcb8fd3b7ce2ad734b3.
• The FFmpeg version used by Phira's static library does not need to be strictly enforced. You may choose any version, but when contributing changes related to audio/video decoding, please strictly follow this version. The officially provided static library is compiled from this version; contributor-provided libraries may differ.
• Pre-compiled static libraries can be downloaded from ESA or EdgeOne. After downloading, extract directly to the project root. If prompted to overwrite, click overwrite.
• prpr-avc only includes the minimal FFmpeg components, compiled with these options:

--disable-everything \
--enable-decoder=h264 \
--enable-decoder=aac \
--enable-decoder=aac_latm \
--enable-decoder=flac \
--enable-decoder=mp3 \
--enable-decoder=vorbis

Building (Example: i686-pc-windows-gnu)

1. Download FFmpeg n5.1.8 source code (GitHub) and extract to any directory.
   • As noted above, the FFmpeg version does not need to be strictly enforced. You may use other versions, but when contributing audio/video decoding changes, please follow the specified version.
2. Operate in sh (using msys2 here; note that FFmpeg source code must be copied to C:\msys64\home\your-username. Build options are not absolute; consult the documentation to customize):

cd FFmpeg-n5.1.8 && mkdir build && cd build

../configure \
  --disable-programs \
  --disable-doc \
  --disable-everything \
  --disable-debug \
  --arch=i686 \
  --target_os=mingw32 \
  --cross-prefix=i686-w64-mingw32-
  
make

Note: There is a common pitfall here. If you get errors, try copying i686-w64-mingw32-gcc-ar.exe, i686-w64-mingw32-gcc-nm.exe, i686-w64-mingw32-gcc-ranlib.exe from msys64\mingw32\bin and renaming them to i686-w64-mingw32-ar.exe, i686-w64-mingw32-nm.exe, i686-w64-mingw32-ranlib.exe.

Then copy all *.a files from the build folder to phira\prpr-avc\static-lib\i686-pc-windows-gnu.

• Note: The above steps only ensure that cargo can compile and output the main program. For actual video decoding, you need to enable protocol=file, decoders, parsers, etc. in configure, as described in the introduction.

Building the MSVC Static Library

• Since FFmpeg's configure is not designed for MSVC, building it is extremely challenging. We do not recommend building the MSVC version yourself. If you need the MSVC static library, please download it directly.
• If you insist on the challenge, refer to the GNU build method above combined with this tutorial.