真的非常感谢您那么耐心，我现在的情况是我就把之前的arm-gcc编译器给删除了，重新弄了一个，然后恩是把ffmpeg重新编译了一遍，报所得库和头文件包含在/usr/local/lib和/usr/local/include
arm-linux-g++ -g -O2 -Wall -I/usr/local/include  -o camera libswscale.cpp -L/usr/local/lib -lavutil -lavformat -lavcodec -lavutil  -lswscale -lgcc
libswscale.cpp:37: warning: deprecated conversion from string constant to 'char*'
libswscale.cpp:43: warning: deprecated conversion from string constant to 'char*'
libswscale.cpp:44: warning: deprecated conversion from string constant to 'char*'
libswscale.cpp: In function 'int read_frame()':
libswscale.cpp:135: warning: unused variable 'i'
libswscale.cpp: In function 'int main(int, char**)':
libswscale.cpp:287: warning: label 'unmap' defined but not used
libswscale.cpp: At global scope:
libswscale.cpp:46: warning: 'file_name' defined but not used
/usr/local/arm/4.4.3/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.3/../../../../arm-none-linux-gnueabi/bin/ld: warning: libx264.so.115, needed by /usr/local/lib/libavutil.so, not found (try using -rpath or -rpath-link)
/usr/local/arm/4.4.3/bin/../lib/gcc/arm-none-linux-gnueabi/4.4.3/../../../../arm-none-linux-gnueabi/bin/ld: warning: libz.so.1, needed by /usr/local/lib/libavformat.so, not found (try using -rpath or -rpath-link)
/tmp/ccCKrf27.o: In function `Convert422_420':
/home/andyhx/Desktop/libcreate/libswscale.cpp:100: undefined reference to `sws_getContext(int, int, PixelFormat, int, int, PixelFormat, int, SwsFilter*, SwsFilter*, double*)'
/home/andyhx/Desktop/libcreate/libswscale.cpp:115: undefined reference to `sws_scale(SwsContext*, unsigned char**, int*, int, int, unsigned char**, int*)'
/home/andyhx/Desktop/libcreate/libswscale.cpp:125: undefined reference to `sws_freeContext(SwsContext*)'
/usr/local/lib/libavcodec.so: undefined reference to `inflateReset'
/usr/local/lib/libavformat.so: undefined reference to `inflateEnd'
/usr/local/lib/libavcodec.so: undefined reference to `compress'
/usr/local/lib/libavcodec.so: undefined reference to `deflate'
/usr/local/lib/libavcodec.so: undefined reference to `deflateInit_'
/usr/local/lib/libavcodec.so: undefined reference to `x264_encoder_encode'
/usr/local/lib/libavformat.so: undefined reference to `inflate'
/usr/local/lib/libavcodec.so: undefined reference to `inflateSync'
/usr/local/lib/libavcodec.so: undefined reference to `compress2'
/usr/local/lib/libavcodec.so: undefined reference to `crc32'
/usr/local/lib/libavcodec.so: undefined reference to `deflateEnd'
/usr/local/lib/libavcodec.so: undefined reference to `deflateReset'
/usr/local/lib/libavcodec.so: undefined reference to `x264_param_default'
/usr/local/lib/libavcodec.so: undefined reference to `x264_encoder_headers'
/usr/local/lib/libavformat.so: undefined reference to `inflateInit_'
/usr/local/lib/libavcodec.so: undefined reference to `deflateInit2_'
/usr/local/lib/libavcodec.so: undefined reference to `x264_encoder_close'
/usr/local/lib/libavcodec.so: undefined reference to `x264_encoder_open_115'
/usr/local/lib/libavformat.so: undefined reference to `uncompress'
collect2: ld returned 1 exit status
make: *** [camera] Error 1

如下是/etc/ld.so.conf文件 root@andyhx-virtual-machine:~/Desktop/libcreate# cat /etc/ld.so.conf
include /etc/ld.so.conf.d/*.conf
/usr/local/lib
如下我的makefile
CC=arm-linux-g++
CFLAGS=-g -O2 -Wall -I/usr/local/include
LDFLAGS= -L/usr/local/lib -lavutil -lavformat -lavcodec -lavutil  -lswscale -lgcc
TARGETS=camera
all: $(TARGETS)
camera:libswscale.cpp
    $(CC) $(CFLAGS) -o $@ $^ $(LDFLAGS)
clean:
    rm -rf $(TARGETS)

非常感谢你，我现在已经ok了，可能原因是之前的 ffmpeg没有编译好，还有个原因是 makefile里的LDflags要增加 -lbx264和-lz，非常 感谢您的帮助

恭喜问题解决。
其实解决问题最终靠的还是你自己，仔细分析出错信息是关键。