This chapter describes ffmpeg on ubuntu18.04 compiler and development environment to build, with reference to the relevant cross compiler may also be present section.

FFmpeg Download

This chapter using multiple versions of current use, previous chapter is compiled ffmpeg4, the actual 4 to 3 to change something, I do not go into these specific.

Use this section 3.2.14 version.

Official Download: http://ffmpeg.org/download.html#releases

CSND Download: https://download.csdn.net/download/qq21497936/12104638

The latest version of the 3.2 series.

Compile ffmpeg

Step one: download, compile placed in a folder

Step two: Configure lack yasm (looks like a support assembly instructions optimization, do not control)

(Note: The prefix parameter is not specified, the default installed directly into the system)

./configure

Change parameters continue configuration, change the dynamic library:

./configure --disable-yasm --enable-shared

Step Three: compiler make

make

Step four: Install sudo make install

sudo make install

Step Five (supplement): For developers need to reload after installation

ldconfig

Command-Line Test

View version

Yuv turn mpeg4 format and packaged as mp4

ffmpeg -s 176x144 -pix_fmt yuv420p -i 176_144.yuv -vcodec mpeg4 176_144.mp4

Qt + FFmpeg project template and built environment ubuntu

Add the library (header files included by default in include system)

FFmpeg add and configure the search path, build step can also refer to " FFmpeg Development Notes (a): ffmpeg introduction, windows development environment to build (mingw and MSVC) " in the " New FFmpeg project ," The main difference is the presence of the configuration file, as follows:

FFmpegServer.pri (I use the system header files and libraries, where no additional introduced)

LIBS +=  \
        -lavcodec \
        -lavdevice \
        -lavfilter \
        -lavformat \
        -lavutil \
        -lpostproc \
        -lswscale

FFmpegMnager.h

#ifndef FFMPEGMANAGER_H
#define FFMPEGMANAGER_H

#include <QObject>

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>
}

class FFmpegManager : public QObject
{
    Q_OBJECT
public:
    explicit FFmpegManager(QObject *parent = nullptr);

signals:

public:
    void testEnv();

};

#endif // FFMPEGMANAGER_H

FFmpegManager.cpp

#include "FFmpegManager.h"
#include <QDebug>

FFmpegManager::FFmpegManager(QObject *parent) : QObject(parent)
{

}

void FFmpegManager::testEnv()
{
    qDebug() << __FILE__ << __LINE__ << avcodec_configuration();
}

测试运行输出

工程模板v1.0.0

工程模板v1.0.0：

使用系统ffmpeg库；
使用系统ffmpeg头文件；
模板不带ffmpeg库（使用系统库文件）；
不单独带ffmpeg头文件（使用系统头文件）；
包含一个测试函数测试环境是否搭建成功。

入坑

入坑一：播放器播放不出yuv格式，专用播放器可以播放yuv（需要设置w、h，甚至是格式：yuv420p，yuv444等等）

原因：

yuv格式用播放器是播放不出来的，因为yuv是原始数据格式，需要设置播放的宽度和高度才能正确解析，大部分播放器不会这么智能。

解决方法：

不播放，直接使用ffmpeg命令进行转换

ffmpeg -s 176x144 -pix_fmt yuv420p -i 176_144.yuv -vcodec mpeg4 176_144.mp4

入坑二：安装ffmpeg后，工程编译成功，但是运行提示失败

原因：

安装完ffmpeg，但是库的路径没有更新。

解决方法：

需要重启计算机或者使用命令ldconfig进行库路径更新，当然也可以设置

QT_LIBRARY_PATH=/usr/local/lib

直接引入。

原博主博客地址：https://blog.csdn.net/qq21497936
原博主博客导航：https://blog.csdn.net/qq21497936/article/details/102478062
本文章博客地址：https://blog.csdn.net/qq21497936/article/details/104081729

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