Qt Creator 配置ffmpeg 开发环境
实际上这就是一个Qt增加第三方库的例子。实际上添加第三方库，就是配置include 和lib 到qt的 pro文件中。
需要下载ffmpeg的dev 和share包。其中include 和lib在dev包中。dll在share包中。
一、方法一：
1.使用Qt的图形化界面，添加库。
2.在弹出的添加库对话框中选择外部库，点下一步。
3.在这一步选择外部库文件（这种图形操作每次只能添加一个lib文件）
4.最终预览通过图形化界面即将增加的pro配置语句。
win32: LIBS += -L$$PWD/../../ffmpeg/ffmpeg-4.2.3-win64-dev/lib/ -lavcodecINCLUDEPATH += $$PWD/../../ffmpeg/ffmpeg-4.2.3-win64-dev/includeDEPENDPATH += $$PWD/../../ffmpeg/ffmpeg-4.2.3-win64-dev/include
很不推荐这种方法，ffmpeg 的lib 库是多个文件，include都在一个目录下。首先他不支持多个库文件添加，第二include文件夹虽然是相同，但是程序依旧会死死的重复添加。所以如果通过图形化添加最终的结果会是这样。虽然系统能够正常识别并编译。但是看着就不爽。
win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lavcodec
INCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lavdeviceINCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lavfilterINCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lavformatINCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lavutilINCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lpostprocINCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lswresampleINCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'win32: LIBS += -L$$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/lib/' -lswscaleINCLUDEPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'DEPENDPATH += $$PWD/'../../ffmpeg 4.3.1/ffmpeg-4.3.1-win64-dev/include'
二、方法二：
自己直接修改pro文件
INCLUDEPATH += $$PWD/ffmpeg-4.2.3-win64-dev/include
LIBS += -L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lavcodec \-L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lavdevice \-L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lavfilter \-L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lavformat \-L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lavutil \-L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lpostproc \-L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lswresample \-L$$PWD/"ffmpeg-4.2.3-win64-dev/lib" -lswscale \
这种办法效率很高。说一下语法
$$PWD：是项目根目录
-L 是寻找目录，注意跟后面的路径buneng 有空格。
-l 是寻找库 ，同样不能有空格
对于多个库 用“\” 符合结尾。
另外相对于QT 图形化工具，我这里少了 DEPENDPATH(应用程序所依赖的搜索路径)。实际操作发现不配置这个变量，程序也可以正常编译执行。
三、其他：
1.最后需要把share包里的dll放到编译后exe相同的目录下。一般是qt 的debug目录。
2.我们是可以把ffmpeg的dev包甚至源文件文件直接放到项目里的。方法是右击项目——add Existing Directiry。
它实际上也是在pro文件里面增加配置代码,但是添加了DISTFILES 和include 环境变量依旧还需要配置libs环境变量。
DISTFILES += \
ffmpeg-4.2.3-win64-dev/lib/avcodec-58.def \ffmpeg-4.2.3-win64-dev/lib/avcodec.lib \ffmpeg-4.2.3-win64-dev/lib/avdevice-58.def \ffmpeg-4.2.3-win64-dev/lib/avdevice.lib \ffmpeg-4.2.3-win64-dev/lib/avfilter-7.def \ffmpeg-4.2.3-win64-dev/lib/avfilter.lib \ffmpeg-4.2.3-win64-dev/lib/avformat-58.def \ffmpeg-4.2.3-win64-dev/lib/avformat.lib \ffmpeg-4.2.3-win64-dev/lib/avutil-56.def \ffmpeg-4.2.3-win64-dev/lib/avutil.lib \ffmpeg-4.2.3-win64-dev/lib/libavcodec.dll.a \ffmpeg-4.2.3-win64-dev/lib/libavdevice.dll.a \ffmpeg-4.2.3-win64-dev/lib/libavfilter.dll.a \ffmpeg-4.2.3-win64-dev/lib/libavformat.dll.a \ffmpeg-4.2.3-win64-dev/lib/libavutil.dll.a \ffmpeg-4.2.3-win64-dev/lib/libpostproc.dll.a \ffmpeg-4.2.3-win64-dev/lib/libswresample.dll.a \ffmpeg-4.2.3-win64-dev/lib/libswscale.dll.a \ffmpeg-4.2.3-win64-dev/lib/postproc-55.def \ffmpeg-4.2.3-win64-dev/lib/postproc.lib \ffmpeg-4.2.3-win64-dev/lib/swresample-3.def \ffmpeg-4.2.3-win64-dev/lib/swresample.lib \ffmpeg-4.2.3-win64-dev/lib/swscale-5.def \ffmpeg-4.2.3-win64-dev/lib/swscale.libHEADERS += \ffmpeg-4.2.3-win64-dev/include/libavcodec/ac3_parser.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/adts_parser.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/avcodec.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/avdct.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/avfft.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/d3d11va.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/dirac.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/dv_profile.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/dxva2.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/jni.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/mediacodec.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/qsv.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/vaapi.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/vdpau.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/version.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/videotoolbox.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/vorbis_parser.h \ffmpeg-4.2.3-win64-dev/include/libavcodec/xvmc.h \ffmpeg-4.2.3-win64-dev/include/libavdevice/avdevice.h \ffmpeg-4.2.3-win64-dev/include/libavdevice/version.h \ffmpeg-4.2.3-win64-dev/include/libavfilter/avfilter.h \ffmpeg-4.2.3-win64-dev/include/libavfilter/buffersink.h \ffmpeg-4.2.3-win64-dev/include/libavfilter/buffersrc.h \ffmpeg-4.2.3-win64-dev/include/libavfilter/version.h \ffmpeg-4.2.3-win64-dev/include/libavformat/avformat.h \ffmpeg-4.2.3-win64-dev/include/libavformat/avio.h \ffmpeg-4.2.3-win64-dev/include/libavformat/version.h \ffmpeg-4.2.3-win64-dev/include/libavutil/adler32.h \ffmpeg-4.2.3-win64-dev/include/libavutil/aes.h \ffmpeg-4.2.3-win64-dev/include/libavutil/aes_ctr.h \ffmpeg-4.2.3-win64-dev/include/libavutil/attributes.h \ffmpeg-4.2.3-win64-dev/include/libavutil/audio_fifo.h \ffmpeg-4.2.3-win64-dev/include/libavutil/avassert.h \ffmpeg-4.2.3-win64-dev/include/libavutil/avconfig.h \ffmpeg-4.2.3-win64-dev/include/libavutil/avstring.h \ffmpeg-4.2.3-win64-dev/include/libavutil/avutil.h \ffmpeg-4.2.3-win64-dev/include/libavutil/base64.h \ffmpeg-4.2.3-win64-dev/include/libavutil/blowfish.h \ffmpeg-4.2.3-win64-dev/include/libavutil/bprint.h \ffmpeg-4.2.3-win64-dev/include/libavutil/bswap.h \ffmpeg-4.2.3-win64-dev/include/libavutil/buffer.h \ffmpeg-4.2.3-win64-dev/include/libavutil/camellia.h \ffmpeg-4.2.3-win64-dev/include/libavutil/cast5.h \ffmpeg-4.2.3-win64-dev/include/libavutil/channel_layout.h \ffmpeg-4.2.3-win64-dev/include/libavutil/common.h \ffmpeg-4.2.3-win64-dev/include/libavutil/cpu.h \ffmpeg-4.2.3-win64-dev/include/libavutil/crc.h \ffmpeg-4.2.3-win64-dev/include/libavutil/des.h \ffmpeg-4.2.3-win64-dev/include/libavutil/dict.h \ffmpeg-4.2.3-win64-dev/include/libavutil/display.h \ffmpeg-4.2.3-win64-dev/include/libavutil/downmix_info.h \ffmpeg-4.2.3-win64-dev/include/libavutil/encryption_info.h \ffmpeg-4.2.3-win64-dev/include/libavutil/error.h \ffmpeg-4.2.3-win64-dev/include/libavutil/eval.h \ffmpeg-4.2.3-win64-dev/include/libavutil/ffversion.h \ffmpeg-4.2.3-win64-dev/include/libavutil/fifo.h \ffmpeg-4.2.3-win64-dev/include/libavutil/file.h \ffmpeg-4.2.3-win64-dev/include/libavutil/frame.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hash.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hdr_dynamic_metadata.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hmac.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_cuda.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_d3d11va.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_drm.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_dxva2.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_mediacodec.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_qsv.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_vaapi.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_vdpau.h \ffmpeg-4.2.3-win64-dev/include/libavutil/hwcontext_videotoolbox.h \ffmpeg-4.2.3-win64-dev/include/libavutil/imgutils.h \ffmpeg-4.2.3-win64-dev/include/libavutil/intfloat.h \ffmpeg-4.2.3-win64-dev/include/libavutil/intreadwrite.h \ffmpeg-4.2.3-win64-dev/include/libavutil/lfg.h \ffmpeg-4.2.3-win64-dev/include/libavutil/log.h \ffmpeg-4.2.3-win64-dev/include/libavutil/lzo.h \ffmpeg-4.2.3-win64-dev/include/libavutil/macros.h \ffmpeg-4.2.3-win64-dev/include/libavutil/mastering_display_metadata.h \ffmpeg-4.2.3-win64-dev/include/libavutil/mathematics.h \ffmpeg-4.2.3-win64-dev/include/libavutil/md5.h \ffmpeg-4.2.3-win64-dev/include/libavutil/mem.h \ffmpeg-4.2.3-win64-dev/include/libavutil/motion_vector.h \ffmpeg-4.2.3-win64-dev/include/libavutil/murmur3.h \ffmpeg-4.2.3-win64-dev/include/libavutil/opt.h \ffmpeg-4.2.3-win64-dev/include/libavutil/parseutils.h \ffmpeg-4.2.3-win64-dev/include/libavutil/pixdesc.h \ffmpeg-4.2.3-win64-dev/include/libavutil/pixelutils.h \ffmpeg-4.2.3-win64-dev/include/libavutil/pixfmt.h \ffmpeg-4.2.3-win64-dev/include/libavutil/random_seed.h \ffmpeg-4.2.3-win64-dev/include/libavutil/rational.h \ffmpeg-4.2.3-win64-dev/include/libavutil/rc4.h \ffmpeg-4.2.3-win64-dev/include/libavutil/replaygain.h \ffmpeg-4.2.3-win64-dev/include/libavutil/ripemd.h \ffmpeg-4.2.3-win64-dev/include/libavutil/samplefmt.h \ffmpeg-4.2.3-win64-dev/include/libavutil/sha.h \ffmpeg-4.2.3-win64-dev/include/libavutil/sha512.h \ffmpeg-4.2.3-win64-dev/include/libavutil/spherical.h \ffmpeg-4.2.3-win64-dev/include/libavutil/stereo3d.h \ffmpeg-4.2.3-win64-dev/include/libavutil/tea.h \ffmpeg-4.2.3-win64-dev/include/libavutil/threadmessage.h \ffmpeg-4.2.3-win64-dev/include/libavutil/time.h \ffmpeg-4.2.3-win64-dev/include/libavutil/timecode.h \ffmpeg-4.2.3-win64-dev/include/libavutil/timestamp.h \ffmpeg-4.2.3-win64-dev/include/libavutil/tree.h \ffmpeg-4.2.3-win64-dev/include/libavutil/twofish.h \ffmpeg-4.2.3-win64-dev/include/libavutil/tx.h \ffmpeg-4.2.3-win64-dev/include/libavutil/version.h \ffmpeg-4.2.3-win64-dev/include/libavutil/xtea.h \ffmpeg-4.2.3-win64-dev/include/libpostproc/postprocess.h \ffmpeg-4.2.3-win64-dev/include/libpostproc/version.h \ffmpeg-4.2.3-win64-dev/include/libswresample/swresample.h \ffmpeg-4.2.3-win64-dev/include/libswresample/version.h \ffmpeg-4.2.3-win64-dev/include/libswscale/swscale.h \ffmpeg-4.2.3-win64-dev/include/libswscale/version.h
四、调试
创建一个测试文件
#include <iostream>
#include <stdio.h>using namespace std;extern "C" {#include "libavcodec/avcodec.h"#include "libavformat/avformat.h"#include "libswscale/swscale.h"#include "libavdevice/avdevice.h"}int main(){printf("Hello World!\n");cout << "Test FFmpeg!" << endl;// av_register_all();unsigned version = avcodec_version();cout << "version :" << version;return 0;}
执行后。
