DLNA它 Error, can't findlibavformat ! 解

DLNA库版本号为libdlna-0.2.4

运行./configure出错：

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Error, can't findlibavformat !

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查看config.log文件：

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…

/usr/local/lib/libavformat.a(rtp.o):In function `ff_rtp_get_payload_type':

/home/won/Downloads/ffmpeg/libavformat/rtp.c:99:undefined reference to `av_opt_get_int'

/home/won/Downloads/ffmpeg/libavformat/rtp.c:109:undefined reference to `av_opt_flag_is_set'

/usr/local/lib/libavformat.a(rtp.o):In function `ff_rtp_codec_id':

/home/won/Downloads/ffmpeg/libavformat/rtp.c:148:undefined reference to `av_strcasecmp'

collect2: ldreturned 1 exit status

Error, can't findlibavformat !

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用pkg-config命令查下avformat库使用的共享库的链接CFLAGS：

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$pkg-config libavformat --libs

-pthread-L/usr/local/lib -lavformat -lavcodec -lswresample -lavutil -lrt -lm

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关于pkg-config命令我也是刚接触，关于它的原理的使用方法，能够看下pkg-config的使用方法

改动configure（加上红色部分的这些库）：

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echolog"Checking for libavformat ..."

check_liblibavformat/avformat.h av_register_all -lavformat-pthread -lavformat -lavcodec -lswresample -lavutil -lrt -lm|| die"Error, can't find
libavformat !"

echolog"Checking for libavcodec ..."

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再运行./configure，问题解决。

运行make的出错信息：

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…

gcc test-libdlna.c-W -Wall -Wno-unused-but-set-variable -D_LARGEFILE_SOURCE-D_FILE_OFFSET_BITS=64 -D_REENTRANT -O3 -Isrc -Lsrc -ldlna -lavformat -pthread -lavcodec -lswresample -lavutil
-lrt-lm -o test-libdlna

src/libdlna.so:undefined reference to `av_close_input_file'

src/libdlna.so:undefined reference to `av_find_stream_info'

collect2: ldreturned 1 exit status

make: ***[test-libdlna] Error 1

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解决方法：undefined
reference to `av_close_input_file' 原因分析

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