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Need some regarding compiling ffmpeg with libvpx enabled on windows. Here is the steps i followed and error i got

  1. installed msys2 on windows and installed required packages(git,pkg-config,gcc compiler etc)
  2. cloned libvpx from "https://github.com/webmproject/libvpx.git" and created a vs15 solution(command : ./configure --disable-vp8 --disable-vp9-encoder --target=x86_64-win64-vs15)
  3. open vpx.sln and compiled vpxmd.lib sucessfully(created a vpx.pc file and kept include and libs at proper place)
  4. cloned ffmpeg from https://github.com/FFmpeg/FFmpeg.git and from msys2 i tried building it(command : ./configure --enable-asm --enable-yasm --arch=x86_64 --target-os=win64 --disable-encoders --disable-muxers --enable-libvpx --disable-doc --disable-ffplay --disable-ffprobe --disable-ffmpeg --enable-shared --disable-static --disable-bzlib --disable-libopenjpeg --disable-iconv --disable-zlib --prefix=/d/Stadia/FFmpeg --toolchain=msvc --disable-debug)

ffmpeg libs a building fine but it doesn't include libvpx. config.log is below:

./ffconf.NEscC1Fm/test.c(4): warning C4311: 'type cast': pointer truncation from 'vpx_codec_iface_t *(__cdecl *)(void)' to 'long'

./compat/windows/mslink /usr/local/lib -nologo -I/usr/local/include -libpath:/usr/local/lib -out:./ffconf.NEscC1Fm/test.exe ./ffconf.NEscC1Fm/test.o vpx.lib

LINK : warning LNK4044: unrecognized option '/IC:/msys64/usr/local/include'; ignored lib.obj(vp8_vp8_dx_iface.obj) : MSIL .netmodule or module compiled with /GL found; restarting link with /LTCG; add /LTCG to the link command line to improve linker performance

LINK : warning LNK4044: unrecognized option '/IC:/msys64/usr/local/include'; ignored

LINK : warning LNK4098: defaultlib 'MSVCRT' conflicts with use of other libs; use /NODEFAULTLIB:library lib.obj(vpx_mem_vpx_mem.obj) : error LNK2001: unresolved external symbol __imp_malloc lib.obj(vp8_decoder_threading.obj) : error LNK2001: unresolved external symbol __imp__beginthreadex lib.obj(vp8_decoder_decodeframe.obj) : error LNK2001: unresolved external symbol __imp_fopen ./ffconf.NEscC1Fm/test.exe : fatal error LNK1120: 3 unresolved externals

my msys2 is installed at C:/msys2/ and /home/ correspond to C/msys2/home if i use --extra-ldflags="-L/home/usr/local/lib" , linker treates it as /LC:/msys2/usr/local/lib and hence fails.

A step by step guide would be very much appreciated here

vladwoguer
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Satishsuman
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1 Answers1

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First problem is that your compiled lib have name vpxmd.lib, but ffmpeg trying to use vpx.lib.
Another problem is unresolved external symbols from msvcrt.
Try to change some lines in configure file of ffmpeg from:
VPX_IMG_FMT_HIGHBITDEPTH" "-lvpx $libm_extralibs $pthreads_extralibs"
to:
VPX_IMG_FMT_HIGHBITDEPTH" "-lvpxmd -lmsvcrtd $libm_extralibs $pthreads_extralibs"
and place your vpxmd.lib to the ffmpeg root diriectory.

wad
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