Vcpkg: [ffmpeg[opencl]:x64-windows-static] build failure: opencl not found

[traumedy]

Host Environment

• OS: Windows 10
• Compiler: Visual Studio 2017

ffmpeg 4.2-1

To Reproduce

> vcpkg install ffmpeg[opencl]:x64-windows-static
...
-- Building ffmpeg for Release
CMake Error at scripts/cmake/vcpkg_execute_required_process.cmake:72 (message):
    Command failed: D:/vcpkg/downloads/tools/msys2/msys64/usr/bin/bash.exe --noprofile --norc D:/vcpkg/ports/ffmpeg\build.sh D:/vcpkg/buildtrees/ffmpeg/x64-windows-static-rel D:/vcpkg/buildtrees/ffmpeg/src/n4.2-02d8c63f80 D:/vcpkg/packages/ffmpeg_x64-windows-static "--enable-asm --enable-yasm --disable-doc --enable-debug --enable-runtime-cpudetect --disable-openssl --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-libvpx --disable-libx264 --enable-opencl --disable-lzma --disable-bzlib --enable-avresample  --extra-cflags=-DHAVE_UNISTD_H=0  --extra-cflags=-MT --extra-cxxflags=-MT"
    Working Directory: D:/vcpkg/buildtrees/ffmpeg/x64-windows-static-rel
    Error code: 1
...
> type buildtrees\ffmpeg\build-x64-windows-static-rel-out.log
=== CONFIGURING ===
ERROR: opencl not found
...

opencl:x64-windows-static IS installed.
ffmpeg[opencl]:x64-windows builds fine.

[JackBoosY]

@cenit Could you have a look?
I tried to switch the build process to vcpkg_configure_make, but ffmpeg's bad macro usage caused the debug mode to fail to build.
Macro should not be used for if!

I finally got the reason: in static mode we should add -lAdvapi32 -lOle32 -lCfgmgr32 to configure.

[traumedy]

The same seems to be true for some other optional dependencies though with slightly different errors sometimes:
ERROR: lzma requested but not found
ERROR: openssl not found
The rest of the optional dependencies DO seem to work:
x264
bzip2
vpx

[JackBoosY]

@traumedy I can successfully build ffmpeg[lzma] on Windows and Linux, please provide your failure logs.

Thanks.

[traumedy]

That basically is the entirety of the log.

D:\vcpkg>vcpkg install ffmpeg[lzma]:x64-windows-static
...
-- Building Options: --enable-asm --enable-yasm --disable-doc --enable-debug --enable-runtime-cpudetect --disable-openssl --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-libvpx --disable-libx264 --disable-opencl --enable-lzma --disable-bzlib --enable-avresample  --extra-cflags=-DHAVE_UNISTD_H=0
-- Building Relase Options:  --extra-cflags=-MT --extra-cxxflags=-MT
-- Building ffmpeg for Release
CMake Error at scripts/cmake/vcpkg_execute_required_process.cmake:72 (message):
    Command failed: D:/vcpkg/downloads/tools/msys2/msys64/usr/bin/bash.exe --noprofile --norc D:/vcpkg/ports/ffmpeg\build.sh D:/vcpkg/buildtrees/ffmpeg/x64-windows-static-rel D:/vcpkg/buildtrees/ffmpeg/src/n4.2-02d8c63f80 D:/vcpkg/packages/ffmpeg_x64-windows-static "--enable-asm --enable-yasm --disable-doc --enable-debug --enable-runtime-cpudetect --disable-openssl --disable-ffmpeg --disable-ffplay --disable-ffprobe --disable-libvpx --disable-libx264 --disable-opencl --enable-lzma --disable-bzlib --enable-avresample  --extra-cflags=-DHAVE_UNISTD_H=0  --extra-cflags=-MT --extra-cxxflags=-MT"
    Working Directory: D:/vcpkg/buildtrees/ffmpeg/x64-windows-static-rel
    Error code: 1
    See logs for more information:
      D:\vcpkg\buildtrees\ffmpeg\build-x64-windows-static-rel-out.log

Call Stack (most recent call first):
  ports/ffmpeg/portfile.cmake:189 (vcpkg_execute_required_process)
  scripts/ports.cmake:94 (include)
...
D:\vcpkg> type D:\vcpkg\buildtrees\ffmpeg\build-x64-windows-static-rel-out.log
=== CONFIGURING ===
ERROR: lzma requested but not found
...

[JackBoosY]

@traumedy Confirmed, thanks.
In _config.log_:

cl.exe -D_ISOC99_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -D_USE_MATH_DEFINES -D_CRT_SECURE_NO_WARNINGS -D_CRT_NONSTDC_NO_WARNINGS -D_WIN32_WINNT=0x0600 -nologo -DHAVE_UNISTD_H=0 -MT -c -Fo./ffconf.pcZXGG5F/test.o ./ffconf.pcZXGG5F/test.c
test.c
./ffconf.pcZXGG5F/test.c(3): warning C4311: 'type cast': pointer truncation from 'uint32_t (__cdecl *)(void)' to 'long'
/f/vcpkg/buildtrees/ffmpeg/src/n4.2-02d8c63f80/compat/windows/mslink -nologo -out:./ffconf.pcZXGG5F/test.exe ./ffconf.pcZXGG5F/test.o lzma.lib
test.o : error LNK2019: unresolved external symbol __imp_lzma_version_number referenced in function check_lzma_version_number
./ffconf.pcZXGG5F/test.exe : fatal error LNK1120: 1 unresolved externals

I think the reason is that the lzma.lib path cannot be found.
Nope, the real reason is we need to define LZMA_API_STATIC.

[JackBoosY]

After change if !defined(LZMA_API_STATIC) && defined(_WIN32) && !defined(__GNUC__) to if 0 in _VCPKG_PATH/installed/x64-windows-static/include/lzma.h_ line 191, it works.

[LilyWangL]

Thanks for posting this issue. This issue has been fixed. So I am closing this issue for now.

[foroughmajidi]

On my system nvidia drivers is installed and I installed mingw-w64-x86_64-opencl-icd-git
and I built FFmpeg as following:
1-x86-x64 cross tools command prompt for VS 2019 run as administrator and Open mingw64 from the command prompt
2-cd c:ffmpeg_testffmpeg
3-./configure -- toolchain=msvc --enable-opencl
But opencl not found
I export Path of "cl" and opencl.dll is in c:windowssystem32
Would you mind telling me how to solve it?

[JackBoosY]

@foroughmajidi Could you please open a new issue?

Thanks,