Hello,
I have spent the last 3 days trying to build the ffmpeg 4.4 libraries
(avcodec.dll, avutil.dll, ...) for Windows.
I want to be able to build them for Windows 32 bits and for Windows 64 bits.
I want to build them with the maximum of libs included in it but I want to
stay within the LGPL license.
In particular, I want the libs to be able to decode AV1 and demux MPEG-DASH.
I have tried to build these libs under Windows (using msys 1, then msys 2)
and under Debian (cross-compilation to build Windows DLLs).
I think my closest attempt to success is when I use mingw / sys2
I do this:
- I run cmd from MSVC 10.0
- in the cmd window, I run msys : *msys2_shell.cmd -mingw64*
- in the msys2 window, I type:
export PATH="/c/Program Files (x86)/Microsoft Visual Studio
10.0/VC/BIN/amd64/":$PATH
- then I go to the folder where I have unzipped the ffmpeg snapshot and I
run:
*./configure --target-os=win64 --arch=x86_64 --toolchain=msvc
--enable-shared --enable-demuxer=dash*
or
*./configure --target-os=win64 --arch=x86_64 --toolchain=msvc
--enable-shared --enable-demuxer=dash --enable-cross-compile*
But I get this error:
*cl.exe is unable to create an executable file.If cl.exe is a
cross-compiler, use the --enable-cross-compile option.Only do this if you
know what cross compiling means.C compiler test failed.*
Even if I run only sudo ./configure --toolchain=msvc
I get the same error as above (in *bold*).
the ffbuild/config.log logfile contains this:
*BEGIN ./ffconf.vV44uHf2/test.c 1 int main(void){ return 0; }END
./ffconf.vV44uHf2/test.ccl.exe -nologo -c -Fo./ffconf.vV44uHf2/test.o
./ffconf.vV44uHf2/test.ctest.c./compat/windows/mslink -nologo
-out:./ffconf.vV44uHf2/test.exe ./ffconf.vV44uHf2/test.oLINK : error
LNK2001: symbole externe non r▒solu
mainCRTStartup./ffconf.vV44uHf2/test.exe : fatal error LNK1120: 1 externes
non r▒solusC compiler test failed.*
So I am wondering:
Could someone tell me what is wrong? How could I build the ffmpeg libraries
for Windows using msys2 ?
Thanks in advance!
Thomas
PS: using msys 1.0, I always get this message:
* WARNING: Disabled dash_demuxer because not all dependencies are
satisfied: libxml2 *
even if libxml2 seems to be installed
And when I try to cross-compile under Debian 9.8, I get the error " *lib.exe
not found.*"
I think that the scripts expects to find the MSVC compiler/linker and since
we are now on Debian, they don't exist. I don't know how to fix that.
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