FFmpeg库之ffplay

FFmpeg环境搭建

FFmpeg官网

FFmpeg环境搭建

./configure \
  --prefix="$HOME/ffmpeg" \
  --extra-cflags="-I$HOME/ffmpeg/include" \
  --extra-ldflags="-L$HOME/ffmpeg/lib" \
  --extra-libs=-lpthread \
  --extra-libs=-lm \
  --bindir="$HOME/ffmpeg/bin" \
  --enable-gpl \
  --enable-nonfree \
  --enable-shared \
  --enable-decoder=h264 \
  --enable-parser=h264 

我这里用的是cmake配置，mingw编译，不用移动文件夹

• CMakeLists.txt

cmake_minimum_required ( VERSION 3.16 )

project ( ffmpegTest VERSION 0.1 LANGUAGES CXX )

set ( CMAKE_AUTOUIC ON )
set ( CMAKE_AUTOMOC ON )
set ( CMAKE_AUTORCC ON )

set ( CMAKE_CXX_STANDARD 17 )
set ( CMAKE_CXX_STANDARD_REQUIRED ON )

# 查找FFmpeg库
find_package ( PkgConfig REQUIRED )
set ( ENV{PKG_CONFIG_PATH} "G:/msys64/home/PVer/ffmpeg/lib/pkgconfig" )
pkg_check_modules ( FFMPEG REQUIRED libavcodec libavformat libavutil libswscale libavdevice )

if ( FFMPEG_FOUND )
    include_directories ( ${FFMPEG_INCLUDE_DIRS} )
    link_directories ( ${FFMPEG_LIBRARY_DIRS} )
endif ()

find_package ( QT NAMES Qt6 Qt5 REQUIRED COMPONENTS Widgets )
find_package ( Qt${QT_VERSION_MAJOR} REQUIRED COMPONENTS Widgets )

set ( PROJECT_SOURCES
    main.cpp
    Widget.cpp
    Widget.h
    Widget.ui
)

qt_add_executable ( ffmpegTest
        MANUAL_FINALIZATION
        ${PROJECT_SOURCES}
)

target_link_libraries ( ffmpegTest PRIVATE Qt${QT_VERSION_MAJOR}::Widgets )
target_link_libraries ( ffmpegTest PRIVATE ${FFMPEG_LIBRARIES} )

set_target_properties ( ffmpegTest PROPERTIES
    MACOSX_BUNDLE ON
    WIN32_EXECUTABLE OFF
)

include ( GNUInstallDirs )

install ( TARGETS ffmpegTest
    BUNDLE DESTINATION .
    LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
    RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
)

• Widget.cpp

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

Widget::Widget(QWidget *parent)
    : QWidget(parent), ui(new Ui::Widget)
{
    ui->setupUi(this);
    av_log_set_level(AV_LOG_DEBUG);
    av_log(nullptr, AV_LOG_INFO, "Hello World!\n"); // 初始化FFmpeg
    av_log(nullptr, AV_LOG_INFO, "ffmpeg version:%s\n", av_version_info());
}

Widget::~Widget()
{
    delete ui;
}

ffplay使用

需要把之前编译好的bin文件夹加入环境变量，我的是G:\msys64\home\PVer\ffmpeg\bin
FFplay是一个非常简单的便携式媒体播放器，使用FFmpeg库和SDL库。它主要用作各种FFmpeg api的测试平台。

语法格式：

ffplay [options] [input_url]

通用选项

视频选项

音频选项

快捷键使用

滤镜

直播拉流

ffplay rtmp地址
例如
ffplay rtmp://127.0.0.1/live/room