ffmpeg-libs

The following outlines the compilation of ffmpeg DLL’s and executables using the
Microsoft Visual Studio compiler.

Download Microsoft Visual Studio (Community edition) from
Microsft Website
and install it.
Download MSYS2 x68_64 from link and install it into C:\ folder
Install build tools in msys64
```
     cd C:\msys64
     Execute msys2_shell.cmd
```
Execute in the msys2 shell
```
     pacman -S make gcc diffutils
```
Close the shell.
To avoid a name conflict rename C:\msys64\usr\bin\link.exe into
C:/msys64/usr/bin/link_old.exe. This ensures that your compile environment will
use the linker from the Microsoft Visual Studio.
Install YASM

Download Win64.exe from link and rename
the downloaded executable to yasm.exe. Create the folder C:\yasm and place the renamed file into
this latter. Add this folder to your path.
Setup the environment variables for the 64 bit build

Run the following batch script in the
windows command line tool:
```
     cd C:\Program Files (x86)\Microsoft Visual Studio 14.0\VC
     vcvarsall.bat x64
```
The flag x64 sets the environment up for compilation of 64 bit versions.
Switch to the MSYS shell

In the windows command line from the prior step navigate to C:\msys64.
Run the command: msys2_shell.cmd -msys -use-full-path
This ensures that the environment variables PATH and LIB carry over into the
msys shell. This opens a new msys shell in a separate window.

In the msys shell CHECK the compiler and linker:

     $ which cl
     /c/Program Files (x86)/Microsoft Visual Studio 14.0/VC/BIN/amd64/cl
     $ which link
     /c/Program Files (x86)/Microsoft Visual Studio 14.0/VC/BIN/amd64/link

This ensures that your MVS compiler and linker are used.

Download FFmpeg source code

Download the ZIP file of the latest FFmpeg source code
from the Github Repository
and unzip the file into the folder FFmpeg-release-x.x.x.

Configure for compilation of 64 bit DLLs
In the msys shell:

    cd /c/PATH/TO/FFMPEG_SOURCE/

Run the following command to configure the build for FFmpeg:

 ./configure --toolchain=msvc 
                --enable-swscale 
                --enable-asm 
                --enable-yasm 
                --target-os=win64 
                --arch=x86_64 
                --enable-shared 
                --disable-static 
                --disable-ffserver 
                --disable-avdevice 
                --disable-doc 
                --disable-ffplay 
                --disable-ffprobe 
                --disable-ffmpeg 
                --enable-w32threads

A successful configuration ends with the lines

    License: LGPL version 2.1 or later
    Creating config.mak, config.h, and doc/config.texi...
    config.asm is unchanged
    libavutil/avconfig.h is unchanged
    WARNING: pkg-config not found, library detection may fail.
    libavcodec/bsf_list.c is unchanged
    libavformat/protocol_list.c is unchanged

You can ignore the pkg-config not found issue. It will not affect compilation.

Compile the source code to produce DLLs
```
    make -j4
```
The -j4 flag indicates to use 4 threads for compilation. This
speeds up the compilation process. You may want to set the number
of threads even higher depending on your hardware.

The successful compilation ends with.

    LD      libavdevice/avdevice-57.dll
       Creating library libavdevice/avdevice.lib and object libavdevice/avdevice.exp
    LD      ffmpeg_g.exe
    LD      ffprobe_g.exe
    CP      ffprobe.exe
    STRIP   ffprobe.exe
    skipping strip ffprobe.exe
    CP      ffmpeg.exe
    STRIP   ffmpeg.exe
    skipping strip ffmpeg.exe

Resources

Useful installation guides: