【ffmpeg】编译时报错：error: undefined reference to `av...

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1、问题描述

昨天使用ffmpeg库编译demo一切正常，今天再次链接ffmpeg库时报了一堆错误：

error: undefined reference to `av_frame_alloc()'
error: undefined reference to `avio_close(AVIOContext*)'
error: undefined reference to `avcodec_find_encoder(AVCodecID)'
error: undefined reference to `avcodec_alloc_context3(AVCodec const*)'
error: undefined reference to `av_opt_set(void*, char const*, char const*, int)'
error: undefined reference to `avcodec_open2(AVCodecContext*, AVCodec const*, AVDictionary**)'
error: undefined reference to `av_frame_alloc()'
error: undefined reference to `av_image_alloc(unsigned char**, int*, int, int, AVPixelFormat, int)'
error: undefined reference to `avformat_alloc_context()'
error:

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