openCV - Method to use user-built ffmpeg in windows OS
Hi Technical Team,
I am using Opencv 4.9.0 in windows 11 OS.
I have read the readme.txt from openCV source directory “opencv-4.9.0\3rdparty\ffmpeg”.
From the “readme.txt” file, I understood that Linux platform is having support to use user-build ffmpeg but it is not mentioned for windows platform.
My question:
How do i customize/configure CMake to use “user-build ffmpeg” ?
Thanks,
Ratheesh
Hi,
Thanks for your immediate response.
From your above link i could not find below suggested directory in source of opencv-4.9.0 or also in build directory **<FFMPEG_BUILD>**
My question:
Regards,
Ratheesh
**<FFMPEG_BUILD>** is the directory containing your ffmpeg build.
You then add the cmake script and add it to your path. I don’t think the linked cmake script works with the latest version of FFMpeg but the two pre-built versions I linked to in that post will.
Hi,
Thanks for your response.
I have followed steps 1 to 4 from the above link.
For the step 5 ( flag OPENCV_FFMPEG_USE_FIND_PACKAGE=ON) , I am not finding this flag OPENCV_FFMPEG_USE_FIND_PACKAGE in cmake-gui.
Please find the screenshot for this
Please give your suggestion.
Regards,
Ratheesh
Either add it using Add Entry or use the command line. I would use the CMake command line and not the GUI because you will be able to get more help when things go wrong. i.e. Its easy to reproduce exactly what you have done.
Hi,
I am not familiar with command line execution in CMake.
After followed your instructed steps, i found below in CMake-GUI console only
Video I/O:
DC1394: NO
FFMPEG: YES (find_package)
avcodec: YES (59.18.100)
avformat: YES (59.16.100)
avutil: YES (57.17.100)
swscale: YES (6.4.100)
avresample: NO
DirectShow: YES
Media Foundation: YES
DXVA: YES
My Question:
Regards,
Ratheesh
The output above confirms it. The prebuilt binaries output would be
-- Video I/O: -- DC1394: NO -- FFMPEG: YES (prebuilt binaries) -- avcodec: YES (58.134.100) -- avformat: YES (58.76.100) -- avutil: YES (56.70.100) -- swscale: YES (5.9.100) -- avresample: YES (4.0.0) -- GStreamer: NO -- DirectShow: YES -- Media Foundation: YES -- DXVA: YES
Don’t forget to add <FFMPEG_BUILD>/bin to your path.
when i used opencv4.10 and ffmpeg-n5.1-latest-win64-gpl-shared-5.1.zip ,i got as
Found FFMPEG: C:/ffmpeg51/include (found version “5.1.6-11-gcde3c5fc0c-20241202”) found components: avutil swresample swscale avcodec avformat avfilter avdevice
FFMPEG is disabled. Can’t find suitable libavcodec library (minimal 54.35.0, found #define LIBAVCODEC_VERSION_MINOR 37;#define LIBAVCODEC_VERSION_MICRO 100.37.100).
FFMPEG is disabled. Can’t find suitable libavformat library (minimal 54.20.4, found #define LIBAVFORMAT_VERSION_MINOR 27;#define LIBAVFORMAT_VERSION_MICRO 100.27.100).
FFMPEG is disabled. Can’t find suitable libswscale library (minimal 2.1.1, found #define LIBSWSCALE_VERSION_MINOR 7;#define LIBSWSCALE_VERSION_MICRO 100.7.100).
FFMPEG libraries version check failed (minimal libav release 9.20, minimal FFMPEG release 1.1.16).
and
Video I/O:
DC1394: NO
FFMPEG: NO (find_package)
avcodec: YES (#define LIBAVCODEC_VERSION_MINOR 37 #define LIBAVCODEC_VERSION_MICRO 100.37.100)
avformat: YES (#define LIBAVFORMAT_VERSION_MINOR 27 #define LIBAVFORMAT_VERSION_MICRO 100.27.100)
avutil: YES (57.28.100)
swscale: YES (#define LIBSWSCALE_VERSION_MINOR 7 #define LIBSWSCALE_VERSION_MICRO 100.7.100)
avresample: NO
GStreamer: NO
DirectShow: YES
Media Foundation: YES
DXVA: YES
is there some thing wrong？please give me a help!
thinks,
jam
Yes the output from CMake is incorrect. What are the exact steps you took?
maybe the ffmpeg i used is the latest and the ffmpeg-config.cmake you mentioned above and provided doesn’t work right。Is there a ffmpeg-config.cmake script fit with the latest ffmpeg
The contents of the file I’m using is below.
#[==[
Provides the following variables:
* `FFMPEG_INCLUDE_DIRS`: Include directories necessary to use FFMPEG.
* `FFMPEG_LIBRARIES`: Libraries necessary to use FFMPEG. Note that this only
includes libraries for the components requested.
* `FFMPEG_VERSION`: The version of FFMPEG found.
The following components are supported:
* `avcodec`
* `avdevice`
* `avfilter`
* `avformat`
* `avresample`
* `avutil`
* `swresample`
* `swscale`
For each component, the following are provided:
* `FFMPEG_<component>_FOUND`: Libraries for the component.
* `FFMPEG_<component>_INCLUDE_DIRS`: Include directories for
the component.
* `FFMPEG_<component>_LIBRARIES`: Libraries for the component.
* `FFMPEG::<component>`: A target to use with `target_link_libraries`.
Note that only components requested with `COMPONENTS` or `OPTIONAL_COMPONENTS`
are guaranteed to set these variables or provide targets.
#]==]
if(NOT DEFINED FFMPEG_ROOT)
get_filename_component(FFMPEG_ROOT "${CMAKE_CURRENT_LIST_DIR}/.." ABSOLUTE)
endif()
function (_ffmpeg_find component headername)
find_path("FFMPEG_${component}_INCLUDE_DIR"
NAMES
"lib${component}/${headername}"
PATHS
"${FFMPEG_ROOT}/include"
~/Library/Frameworks
/Library/Frameworks
/usr/local/include
/usr/include
/sw/include # Fink
/opt/local/include # DarwinPorts
/opt/csw/include # Blastwave
/opt/include
/usr/freeware/include
PATH_SUFFIXES
ffmpeg
DOC "FFMPEG's ${component} include directory")
mark_as_advanced("FFMPEG_${component}_INCLUDE_DIR")
# On Windows, static FFMPEG is sometimes built as `lib<name>.a`.
if (WIN32)
list(APPEND CMAKE_FIND_LIBRARY_SUFFIXES ".a" ".lib")
list(APPEND CMAKE_FIND_LIBRARY_PREFIXES "" "lib")
endif ()
find_library("FFMPEG_${component}_LIBRARY"
NAMES
"${component}"
PATHS
"${FFMPEG_ROOT}/lib"
~/Library/Frameworks
/Library/Frameworks
/usr/local/lib
/usr/local/lib64
/usr/lib
/usr/lib64
/sw/lib
/opt/local/lib
/opt/csw/lib
/opt/lib
/usr/freeware/lib64
"${FFMPEG_ROOT}/bin"
DOC "FFMPEG's ${component} library")
mark_as_advanced("FFMPEG_${component}_LIBRARY")
if (FFMPEG_${component}_LIBRARY AND FFMPEG_${component}_INCLUDE_DIR)
set(_deps_found TRUE)
set(_deps_link)
foreach (_ffmpeg_dep IN LISTS ARGN)
if (TARGET "FFMPEG::${_ffmpeg_dep}")
list(APPEND _deps_link "FFMPEG::${_ffmpeg_dep}")
else ()
set(_deps_found FALSE)
endif ()
endforeach ()
if (_deps_found)
if (NOT TARGET "FFMPEG::${component}")
add_library("FFMPEG::${component}" UNKNOWN IMPORTED)
set_target_properties("FFMPEG::${component}" PROPERTIES
IMPORTED_LOCATION "${FFMPEG_${component}_LIBRARY}"
INTERFACE_INCLUDE_DIRECTORIES "${FFMPEG_${component}_INCLUDE_DIR}"
IMPORTED_LINK_INTERFACE_LIBRARIES "${_deps_link}")
endif ()
set("FFMPEG_${component}_FOUND" 1
PARENT_SCOPE)
set(version_header_path "${FFMPEG_${component}_INCLUDE_DIR}/lib${component}/version.h")
if (EXISTS "${version_header_path}")
string(TOUPPER "${component}" component_upper)
file(STRINGS "${version_header_path}" version
REGEX "#define *LIB${component_upper}_VERSION_(MAJOR|MINOR|MICRO) ")
string(REGEX REPLACE ".*_MAJOR *\([0-9]*\).*" "\\1" major "${version}")
string(REGEX REPLACE ".*_MINOR *\([0-9]*\).*" "\\1" minor "${version}")
string(REGEX REPLACE ".*_MICRO *\([0-9]*\).*" "\\1" micro "${version}")
if (NOT major STREQUAL "" AND
NOT minor STREQUAL "" AND
NOT micro STREQUAL "")
set("FFMPEG_${component}_VERSION" "${major}.${minor}.${micro}" PARENT_SCOPE)
set("FFMPEG_lib${component}_VERSION" "${major}.${minor}.${micro}" CACHE INTERNAL "")
endif ()
endif ()
else ()
set("FFMPEG_${component}_FOUND" 0
PARENT_SCOPE)
set(what)
if (NOT FFMPEG_${component}_LIBRARY)
set(what "library")
endif ()
if (NOT FFMPEG_${component}_INCLUDE_DIR)
if (what)
string(APPEND what " or headers")
else ()
set(what "headers")
endif ()
endif ()
set("FFMPEG_${component}_NOT_FOUND_MESSAGE"
"Could not find the ${what} for ${component}."
PARENT_SCOPE)
endif ()
endif ()
endfunction ()
_ffmpeg_find(avutil avutil.h)
_ffmpeg_find(avresample avresample.h
avutil)
_ffmpeg_find(swresample swresample.h
avutil)
_ffmpeg_find(swscale swscale.h
avutil)
_ffmpeg_find(avcodec avcodec.h
avutil)
_ffmpeg_find(avformat avformat.h
avcodec avutil)
_ffmpeg_find(avfilter avfilter.h
avutil)
_ffmpeg_find(avdevice avdevice.h
avformat avutil)
if(NOT FFMPEG_FIND_COMPONENTS)
set(FFMPEG_FIND_COMPONENTS avutil swresample swscale avcodec avformat avfilter avdevice) # optional avresample
endif()
if (TARGET FFMPEG::avutil)
set(_ffmpeg_version_header_path "${FFMPEG_avutil_INCLUDE_DIR}/libavutil/ffversion.h")
if (EXISTS "${_ffmpeg_version_header_path}")
file(STRINGS "${_ffmpeg_version_header_path}" _ffmpeg_version
REGEX "FFMPEG_VERSION")
string(REGEX REPLACE ".*\"n?\(.*\)\"" "\\1" FFMPEG_VERSION "${_ffmpeg_version}")
unset(_ffmpeg_version)
else ()
set(FFMPEG_VERSION FFMPEG_VERSION-NOTFOUND)
endif ()
unset(_ffmpeg_version_header_path)
endif ()
set(FFMPEG_INCLUDE_DIRS)
set(FFMPEG_LIBRARIES)
set(__ffmpeg_version_vars)
set(_ffmpeg_required_vars)
foreach (_ffmpeg_component IN LISTS FFMPEG_FIND_COMPONENTS)
if (TARGET "FFMPEG::${_ffmpeg_component}")
set(FFMPEG_${_ffmpeg_component}_INCLUDE_DIRS
"${FFMPEG_${_ffmpeg_component}_INCLUDE_DIR}")
set(FFMPEG_${_ffmpeg_component}_LIBRARIES
"${FFMPEG_${_ffmpeg_component}_LIBRARY}")
list(APPEND FFMPEG_INCLUDE_DIRS
"${FFMPEG_${_ffmpeg_component}_INCLUDE_DIRS}")
list(APPEND FFMPEG_LIBRARIES
"${FFMPEG_${_ffmpeg_component}_LIBRARIES}")
if (FFMEG_FIND_REQUIRED_${_ffmpeg_component})
list(APPEND _ffmpeg_required_vars
"FFMPEG_${_ffmpeg_required_vars}_INCLUDE_DIRS"
"FFMPEG_${_ffmpeg_required_vars}_LIBRARIES")
endif ()
endif ()
endforeach ()
unset(_ffmpeg_component)
if(FFMPEG_INCLUDE_DIRS)
list(REMOVE_DUPLICATES FFMPEG_INCLUDE_DIRS)
endif ()
include(FindPackageHandleStandardArgs)
find_package_handle_standard_args(FFMPEG
REQUIRED_VARS FFMPEG_INCLUDE_DIRS FFMPEG_LIBRARIES ${_ffmpeg_required_vars}
VERSION_VAR FFMPEG_VERSION
HANDLE_COMPONENTS)
unset(_ffmpeg_required_vars)