Windows 平台下使用ffmepg

秒速五厘米 2023-01-01 02:52 229阅读 0赞

本文记录下windows平台下测试ffmpeg的过程。

项目源码已上传github，[https://github.com/whcx/FFmpegPrj/tree/master][https_github.com_whcx_FFmpegPrj_tree_master]

1，首先ffmpeg库的编译，可以从ffmepg官网下载编译好的库。

2，Visual studio中创建window 项目。

引用第三方头文件、库文件的配置，可以在项目属性中配置头文件、库文件的路径，这种方式不利于项目的合作开发，这里使用cmake的形式做编译配置。

cmake_minimum_required(VERSION 3.16)
    project(FFmpegWin)
    
    message("begain compile ...")
    message("CMAKE_CURRENT_LIST_DIR... ${CMAKE_CURRENT_LIST_DIR}")
    message("CMAKE_CURRENT_SOURCE_DIR...${CMAKE_CURRENT_SOURCE_DIR}")
    message("CMAKE_BINARY_DIR... ${CMAKE_BINARY_DIR}")
    
    set(CONFIG_NAME "$<$<CONFIG:Debug>:Debug>$<$<CONFIG:Release>:Release>$<$<CONFIG:RelWithDebInfo>:RelWithDebInfo>")
    
    set(CMAKE_RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin")
    
    file(GLOB_RECURSE SRC_FILES ${CMAKE_CURRENT_LIST_DIR}/src/*.cpp)
    
    message("srcs ... ${SRC_FILES}")
    
    add_executable(FFmpegWin ${SRC_FILES})
    
    set_property(TARGET FFmpegWin PROPERTY VS_DEBUGGER_WORKING_DIRECTORY "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${CONFIG_NAME}/")
    
    target_include_directories(FFmpegWin
    	PUBLIC
    	${CMAKE_CURRENT_LIST_DIR}/include)
    
    target_link_libraries(FFmpegWin
    	PUBLIC
    	${CMAKE_CURRENT_LIST_DIR}/lib/avcodec.lib
    	${CMAKE_CURRENT_LIST_DIR}/lib/avformat.lib
    	${CMAKE_CURRENT_LIST_DIR}/lib/avutil.lib
    	${CMAKE_CURRENT_LIST_DIR}/lib/swresample.lib
    	${CMAKE_CURRENT_LIST_DIR}/lib/swscale.lib)
    
    add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_COMMAND} -E
    	copy_if_different "${CMAKE_CURRENT_LIST_DIR}/lib/avcodec-58.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${CONFIG_NAME}")
    add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_COMMAND} -E
    	copy_if_different "${CMAKE_CURRENT_LIST_DIR}/lib/avformat-58.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${CONFIG_NAME}")
    add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_COMMAND} -E
    	copy_if_different "${CMAKE_CURRENT_LIST_DIR}/lib/avutil-56.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${CONFIG_NAME}")
    add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_COMMAND} -E
    	copy_if_different "${CMAKE_CURRENT_LIST_DIR}/lib/swresample-3.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${CONFIG_NAME}")
    add_custom_command(TARGET ${PROJECT_NAME} POST_BUILD COMMAND ${CMAKE_COMMAND} -E
    	copy_if_different "${CMAKE_CURRENT_LIST_DIR}/lib/swscale-5.dll" "${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${CONFIG_NAME}")

在target\_include\_directories中包含头文件，在target\_link\_libraries中指定库文件的链接，同时把dll拷贝到程序可执行文件所在目录。

在源码中加入指令，设置库的链接。

#pragma comment (lib,"avcodec.lib")
    #pragma comment (lib,"avformat.lib")
    #pragma comment (lib,"avutil.lib")
    #pragma comment (lib,"swresample.lib")

项目中只做了使用ffmpeg解码MP4的视频帧，没有做显示，后续会补充。

void executeFFmpeg()
    {
    	char file_path[] = "http://clips.vorwaerts-gmbh.de/big_buck_bunny.mp4";
    	std::string s_file_Path("D:\\VisualStudioWorkspace\\FFmpegWin\\bin\\Debug\\test-video.mp4");
    
    	vidoPlayer = std::make_shared<VideoPlayerWin>();
    	vidoPlayer.get()->SetUrl(s_file_Path);
    	vidoPlayer.get()->Start(s_file_Path);
    
    	while (1)
    	{
    		std::this_thread::sleep_for(std::chrono::milliseconds(1000));
    	}
    }
    
    int main(int argc, char* argv[])
    {
    	
    	std::thread t_ffmpeg(executeFFmpeg);
    	t_ffmpeg.join();
    
    	return 0;
    }

ffmepg解码，保存yuv的实现在VideoPlayerWin.cpp, WriteYuv.cpp文件中，可以在通过：播放yuv文件： ffplay -f rawvideo -video\_size 1280\*720 frame1280x720-0.yuv 本地文件 来检查解码是否正确。

[https_github.com_whcx_FFmpegPrj_tree_master]: https://github.com/whcx/FFmpegPrj/tree/master