on windows 10 compile mfx_dispatch with MSDK 2021 R1 and FFMPEG for QSV function failed, do you have any guide for this?

[zhaoye1]

when I running ./ffmpeg.exe -i in.mp4 -vcodec h264_qsv out.h264
it report error:
[h264_qsv @ 000002305B5F00C0] Error querying encoder params: unsupported (-3)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

and when compile the FFMPEG with :mfx.lib is not found.
../configure --disable-stripping --disable-static --enable-shared --enable-debug=3 --disable-optimizations --enable-libmfx --enable-encoder=h264_qsv --enable-decoder=h264_qsv --toolchain=msvc --enable-cross-compile --extra-cflags='-I/C:/msys64/mingw64/include' --extra-ldflags='-libpath:/C:/msys64/mingw64/lib -DEFAULTLIB:legacy_stdio_definitions.lib' --prefix=../build
it log report:
check_pkg_config libmfx libmfx mfx/mfxvideo.h MFXInit
test_pkg_config libmfx libmfx mfx/mfxvideo.h MFXInit
pkg-config --exists --print-errors libmfx
check_func_headers mfx/mfxvideo.h MFXInit -IC:/msys64/mingw64/include -LC:/msys64/mingw64/lib -lmfx -lstdc++ -lole32 -luuid
test_ld cc -IC:/msys64/mingw64/include -LC:/msys64/mingw64/lib -lmfx -lstdc++ -lole32 -luuid
test_cc -IC:/msys64/mingw64/include -libpath:C:/msys64/mingw64/lib
BEGIN ./ffconf.ALlfLpqR/test.c
1 #include <mfx/mfxvideo.h>
2 #include <stdint.h>
3 long check_MFXInit(void) { return (long) MFXInit; }
4 int main(void) { int ret = 0;
5 ret |= ((intptr_t)check_MFXInit) & 0xFFFF;
6 return ret; }
END ./ffconf.ALlfLpqR/test.c
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 -DPIC -nologo -I/C:/msys64/mingw64/include -IC:/msys64/mingw64/include -libpath:C:/msys64/mingw64/lib -c -Fo./ffconf.ALlfLpqR/test.o ./ffconf.ALlfLpqR/test.c
cl : Command line warning D9002 : ignoring unknown option '-libpath:C:/msys64/mingw64/lib'
test.c
./ffconf.ALlfLpqR/test.c(3): warning C4311: 'type cast': pointer truncation from 'mfxStatus (__cdecl *)(mfxIMPL,mfxVersion *,mfxSession *)' to 'long'
/home/iotg/package/FFmpeg/compat/windows/mslink -libpath:/C:/msys64/mingw64/lib -DEFAULTLIB:legacy_stdio_definitions.lib -nologo -IC:/msys64/mingw64/include -libpath:C:/msys64/mingw64/lib -out:./ffconf.ALlfLpqR/test.exe ./ffconf.ALlfLpqR/test.o mfx.lib ole32.lib uuid.lib
LINK : warning LNK4044: unrecognized option '/IC:/msys64/mingw64/include'; ignored
LINK : fatal error LNK1181: cannot open input file 'mfx.lib'
require libmfx mfx/mfxvideo.h MFXInit -llibmfx -ladvapi32
check_lib libmfx mfx/mfxvideo.h MFXInit -llibmfx -ladvapi32
check_func_headers mfx/mfxvideo.h MFXInit -llibmfx -ladvapi32
test_ld cc -llibmfx -ladvapi32
test_cc
BEGIN ./ffconf.ALlfLpqR/test.c
1 #include <mfx/mfxvideo.h>
2 #include <stdint.h>
3 long check_MFXInit(void) { return (long) MFXInit; }
4 int main(void) { int ret = 0;
5 ret |= ((intptr_t)check_MFXInit) & 0xFFFF;
6 return ret; }
END ./ffconf.ALlfLpqR/test.c

on windows, mfx_dispatcher compile result is libmfx.a and libmfx.la, which can not be use in FFmpeg. it just require libmfx.lib

[maximd33]

you might want to specify bitrate for ffmpeg, like -b:v 5M
see https://trac.ffmpeg.org/wiki/Hardware/QuickSync

compilation : recommendations to use cross compilation, not MSVC compiler directly,
otherwise you would need to experiment with it

[zhaoye1]

it will report the same error:
./ffmpeg.exe -i out.h264 -vcodec h264_qsv -b:v 5M out1.h264
ffmpeg version N-102969-g7ec7e6aa2d Copyright (c) 2000-2021 the FFmpeg developers
built with Microsoft (R) C/C++ Optimizing Compiler Version 19.28.29336 for x64
configuration: --disable-stripping --enable-debug=3 --disable-optimizations --enable-debug --enable-libmfx --toolchain=msvc --enable-cross-compile --extra-cflags='-I/C:/msys64/mingw64/include -Z7' --extra-ldflags='-libpath:/C:/msys64/mingw64/lib -DEFAULTLIB:legacy_stdio_definitions.lib' --prefix=../Build
libavutil 57. 0.100 / 57. 0.100
libavcodec 59. 3.101 / 59. 3.101
libavformat 59. 4.100 / 59. 4.100
libavdevice 59. 0.100 / 59. 0.100
libavfilter 8. 0.103 / 8. 0.103
libswscale 6. 0.100 / 6. 0.100
libswresample 4. 0.100 / 4. 0.100
Input #0, h264, from 'out.h264':
Duration: N/A, bitrate: N/A
Stream #0:0: Video: h264 (High), yuv420p(progressive), 1920x1080 [SAR 1:1 DAR 16:9], 30 fps, 30 tbr, 1200k tbn
File 'out1.h264' already exists. Overwrite? [y/N] y
Stream mapping:
Stream #0:0 -> #0:0 (h264 (native) -> h264 (h264_qsv))
Press [q] to stop, [?] for help
[h264_qsv @ 00000282ABEEC040] Error querying encoder params: unsupported (-3)
Error initializing output stream 0:0 -- Error while opening encoder for output stream #0:0 - maybe incorrect parameters such as bit_rate, rate, width or height
Conversion failed!

[zhaoye1]

do you have cross compilation guide for FFMPEG and QSV on windows ?

[maximd33]

@zhaoye1
FFMPEG: you can follow any cross compilation guide, like from https://trac.ffmpeg.org/wiki/CompilationGuide/CrossCompilingForWindows

QSV requires --enable-libmfx option and mfx_dispatch pre-installed,
already described at https://github.com/lu-zero/mfx_dispatch#building-using-autotools

it should be better to create issue at FFMPEG support page
if any problems