Qt+ffmpeg environment construction

download FFmpeg library

FFmpeg The library can be compiled using the source code or downloaded from the Internet , Here we use the compiled library file downloaded from the Internet .
1. From the website ：https://ffmpeg.zeranoe.com/builds/ Download compiled FFmpeg library . I choose to download 64 Bit Library .
2. Download the compiled library address https://github.com/BtbN/FFmpeg-Builds/releases

Static,Share,Dev Download all three , The three downloaded files are ：
Download compiled ffmpeg library

add to FFmpeg Library to Qt project

Use QtCreator Create a Qt gui project , After creating the project ：

Create... In the project root directory ffmpeg Folder , stay ffmpeg Create in folder include and lib Folder

1. decompression ffmpeg-3.4-win64-dev.zip Compressed files
2. After unzipping ffmpeg-3.4-win64-dev Under the folder include Copy all header files in the directory to the newly created ffmpeg In the catalog include Folder in
3. After unzipping ffmpeg-3.4-win64-dev Under the folder lib All in catalog dll.a Copy the ending file to ffmpeg Of lib In the folder
4. After unzipping ffmpeg-3.4-win64-shared Under the folder bin All in catalog dll Copy the ending file to ffmpeg Of bin In the folder
   
   

Modification item pro file , stay pro Add the following to the file ：

INCLUDEPATH += ../ffmpeg/include

LIBS += -L../ffmpeg/lib \
        -lavcodec \
        -lavfilter \
        -lavformat \
        -lavutil \
        -lswscale

LIBS += -L../ffmpeg/bin \
        -lavcodec \
        -lavfilter \
        -lavformat \
        -lavutil \
        -lswscale

test FFmpeg Whether the library can be used normally

1. In the project FFmpegLibTestFrm.cpp Add... To the file FFmpeg The header file

extern "C"
{
    
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libswscale/swscale.h>
#include <libavdevice/avdevice.h>
#include <libavformat/version.h>
#include <libavutil/time.h>
#include <libavutil/mathematics.h>
}

2. stay FFmpegLibTestFrm Add the following code to the constructor

FFmpegLibTestFrm::FFmpegLibTestFrm(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::FFmpegLibTestFrm)
{
    
    ui->setupUi(this);

    qDebug("------------------------------------------------------------------");
    qDebug("%s", avcodec_configuration());
    qDebug("version: %d", avcodec_version());
    qDebug("------------------------------------------------------------------");
}

3. Compile run program , Compile successfully
   

The effect is as follows