FFMpeg示例程序 [英] FFMpeg sample program

问题描述

我正在学习Martin Bohme的ffmpeg教程教程这里

，我想使用代码块IDE编译ffmpeg示例程序，但不能

  #include< stdio.h> 
 #include< stdlib.h> 
 
 #includelibavcodec / avcodec.h
 #includelibavformat / avformat.h
 
 int main（int argc，char * argv []） 
 {
 av_register_all（）; 
 
 return 0; 
} 
  

请帮助我。如何编译我正在使用Linux（Ubuntu）

解决方案

你必须告诉编译器头文件和库文件的位置。这是由 -I 标志来告诉哪些目录包含头文件， -L 来告诉哪些目录包含库。您还需要 -l <​​/ code>来告诉哪些库可以链接。

标志可以这样使用：

 
 $ g ++ -I / path / to / headers myprogram.cpp -L / path / to / libraries -lthelibrary 
 

有关库的注意事项：在Linux（和UNIX系统）上，它们是名称以lib开头并以.a扩展名结尾的文件。所以。当使用 -l <​​/ code>标志指定库时，请执行 写入。所以对于一个库文件libfoo.a，你只能使用 -lfoo 来链接。

有关gcc和g ++选项的更多信息，请参阅 http：//gcc.gnu。 org / onlinedocs / gcc / Invoking-GCC.html 。

编辑：对于像Code :: Blocks这样的IDE，可能是一些项目设置，您可以添加包含和库目录和链接库。检查项目菜单中的设置或属性选项。

Edit2：参见例如此常见问题在Code ::块，预处理器设置应该靠近。

I am currently learning ffmpeg tutorial of Martin Bohme Tutorial Here

and I want to compile an ffmpeg sample program using Code Block IDE but, it can't

#include <stdio.h>
#include <stdlib.h>

#include "libavcodec/avcodec.h"
#include "libavformat/avformat.h"

int main(int argc, char *argv[])
{
av_register_all();

    return 0;
}

Please help me. How to compile it. I am using Linux (Ubuntu)

解决方案

You have to tell the compiler where the header and library files are. This is done by the -I flag to tell which directories contain header files, and -L to tell which directories contains libraries. You will also need -l to tell which libraries to link with.

The flags can be used like this:

$ g++ -I/path/to/headers myprogram.cpp -L/path/to/libraries -lthelibrary

A note about libraries: On Linux (and UNIX systems) they are files with names that start with "lib" and end with the extension ".a" or ".so". When specifying the library with the -l flag you do not write those. So for a library file "libfoo.a", you only use -lfoo to link with it.

For more information about the options of gcc and g++, see http://gcc.gnu.org/onlinedocs/gcc/Invoking-GCC.html.

Edit: For an IDE like Code::Blocks there most likely is some project setting where you can add include and library directories and link libraries. Check the "Project" menu for a "Settings" or "Properties" alternative.

Edit2: See for example this FAQ where to find linker settings in Code::Blocks, the pre-processor settings should be close by.

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