ubuntu xvid x264 交叉编译
使用的环境是3.4.1
xvidcore1.1.3
键入：#CC=arm-linux-gcc ./configure --prefix=/usr/local/arm/arm-linux --build=i686-pc-linux --host=arm-linux --target=arm-linux
#make
#make install
在进入example目录
输入
arm-linux-gcc -o xvid_encraw xvid_encraw.c -lc -lm -I../src/ -L../build/generic/=build -lxvidcore
即可生成xvid_encraw
file 这个文件：for linux 2.4.3
x264-20060805-2245:
./configure --prefix=/usr/local/arm/arm-linux --enable-shared --enable-debug
得到的文件，需要修改config.mak
ARCH = ARM
CC=arm-linux-gcc
去掉CFLAGS中 -DHAVE_MMXEXT -DHAVE_SSE2 -DARCH_X86
LDFLAGS中添加 -s
修改Makefile 文件66~68
arm-linux-ar rc
arm-linux-ranlib
然后make && make install
出现错误：
common/cpu.c: In function `x264_cpu_num_processors':
common/cpu.c:172: error: `cpu_set_t' undeclared (first use in this function)
common/cpu.c:172: error: (Each undeclared identifier is reported only once
common/cpu.c:172: error: for each function it appears in.)
common/cpu.c:172: error: parse error before ')' token
make: *** [common/cpu.o] Error 1
解决办法：
在common/cpu.c中找到x264_cpu_num_processors这个函数，在这个函数中有如下代码，功能是得到你的电脑cpu的个数：
#elif defined(SYS_LINUX) || defined(WIN32)
int np;
#if defined(WIN32)
uint32_t p_aff, s_aff;
GetProcessAffinityMask( GetCurrentProcess(), &p_aff, &s_aff );
#else
// uint64_t p_aff;
// sched_getaffinity( 0, sizeof(p_aff), (cpu_set_t*)&p_aff );
#endif
// for( np = 0; p_aff != 0; p_aff >>= 1 )
// np += p_aff&1;
np =1;//此处就是你电脑cpu的个数
return np;
然后重新make,这个问题就解决了。
ffmpeg0.5:
root@ubuntu:/home/thinkpad/tools/ffmpeg-0.5# ./configure --prefix=/usr/local/arm/arm-linux/ --enable-cross-compile --arch=libavcodec/armv4l/ --cross-prefix=/usr/local/arm/3.4.1/bin/arm-linux- --cc=gcc --enable-static --disable-ipv6 --enable-libx264 --enable-gpl --enable-pthreads --target-os=linux --disable-network --enable-swscale --enable-shared --extra-libs=/usr/local/arm/arm-linux/lib/
然后再configure，如果还有错误，如：
ERROR: x264 not found 你在configure时把libx264库加上就可以了：--extra-libs=/usr/local/lib/ 此路径是你的x264的安装路径。
WARNING: Unknown CPU "./libavcodec/armv4l/", ignored.这个错误要将--cpu=libavcodec/armv4l/改成--arch=libavcodec/armv4l/
如果出现如下错误，
/usr/local/arm/2.95.3/bin/arm-linux-gcc is unable to create an executable file.
C compiler test failed.
会发现只要去掉--extra-libs=/usr/local/lib/后，这个错误就没了，但是有ERROR: x264 not found 那个错误，郁闷，怎么解决呢？
......
查看config.log 如下：
gcc /usrlocal/arm/arm-linux/lib/libx264.a -o /tmp/ffconf.** /tmp/
****
/usrlocal/arm/arm-linux/lib/libx264.so could not read symbols : file in wrong format
于是修改--c=/usr/local/arm/3.4.1/bin/arm-linux-gcc 编译再次出现x264找不到，查看log x264.h:no such file or directory
修改：--extra-libs=-L/usr/local/arm/arm-linux/lib/ --extra-ldflags=-L/usr/local/arm/arm-linux/lib/ --extra-cflags=-I/usr/local/arm/arm-linux/include/
报错：libx264 version must be >= 0.99
使用ffmpeg 0.4.9:
./configure --prefix=/usr/local/arm/arm-linux/ --cpu=libavcodec/arm/ --cross-prefix=/usr/local/arm/3.4.1/bin/arm-linux- --cc=gcc --enable-xvid --enable-x264 --enable-gpl --disable-opts --disable-dv1394 --disable-network --enable-shared --extra-libs=-L/usr/local/arm/arm-linux/lib/ --extra-ldflags=-L/usr/local/arm/arm-linux/lib/ --extra-cflags=-I/usr/local/arm/arm-linux/include/
make 的时候错误：
x264.c: In function `X264_init':
x264.c:151: error: structure has no member named `b_cbr'
make[1]: *** [x264.o] Error 1
make[1]: Leaving directory `/home/thinkpad/tools/ffmpeg-0.4.9-p20060302/libavcodec'
make: *** [lib] Error 2
代码不匹配，还是重新下载一个x264：
ftp://ftp.videolan.org/pub/videolan/x264/snapshots/x264-snapshot-20070416-2245.tar.bz2
有人说这样搭配：
Use ffmpeg-0.4.9_p20060816 for x264-svn-20060810 and ffmpeg-0.4.9_p20061016 forx264-svn-20061014.
Closing.
# /usr/local/ffmpeg/bin/ffmpeg -i /tmp/test.avi -y -f image2 -ss 00:00:02 -t 0.001 -s 320x240 /tmp/test.jpg
其中/tmp/test.avi为视频文件，/tmp/test.jpg为截图文件，00:00:02表示截2秒时候的一屏。
如果这时遇到“error while loading shared libraries”，是因为找不到库文件。编辑/etc/ld.so.conf，加入/usr/local/ffmpeg/lib，执行ldconfig即可。
此文件是在window下写的，所以在每行后面会加个ctrl+m就是^M，所以后面的sh就变成sh^M当然是没有这个命令的，所以脚本就不能运行了，把^M去掉就应该没问题了。
输入命令：dos2unix configure 把它转化成linux文件。
如果没有dos2unix此命令，可用此方法：
cat ./configure.sh | tr -d ‘/r’ > temp.sh
mv temp.sh configure.sh
报错：You must include stdint.h or inttypes.h before x264.h
是应为在usr/local/include/ 目录存在一个之前编译的x264.h文件，把他酸楚就可以了。
每次configure 之前都要注意 make distclean 清除之前的痕迹最后ffmpeg的configure 的内容：
root@ubuntu:/home/thinkpad/tools/ffmpeg_x264_src_20071007/ffmpeg# ./configure --prefix=/usr/local/arm/arm-linux/ --disable-static --enable-shared --enable-gpl --enable-swscaler --enable-libx264 --enable-libxvid --disable-strip --arch=libavcodec/armv4l/ --disable-ffplay --disable-ffserver --disable-armv5te --disable-armv6 --disable-zlib --cross-compile --cross-prefix=/usr/local/arm/3.4.1/bin/arm-linux- --cc=gcc --enable-gpl --disable-opts --disable-network --extra-libs=-L/usr/local/arm/arm-linux/lib/ --extra-ldflags=-L/usr/local/arm/arm-linux/lib/ --extra-cflags=-I/usr/local/arm/arm-linux/include/ --disable-ipv6 --enable-pthreads
。。。。
install prefix /usr/local/arm/arm-linux/
source path /home/thinkpad/tools/ffmpeg_x264_src_20071007/ffmpeg
C compiler /usr/local/arm/3.4.1/bin/arm-linux-gcc
make make
.align is power-of-two yes
ARCH unknown (generic)
big-endian no
gprof enabled no
debug symbols yes
strip symbols no
optimize no
static no
shared yes
postprocessing support no
software scaler enabled yes
video hooking yes
Imlib2 support no
FreeType support no
network support no
threading support pthreads
SDL support no
Sun medialib support no
AVISynth enabled no
liba52 support no
liba52 dlopened no
libamr-nb support no
libamr-wb support no
libdc1394 support no
libfaac enabled no
libfaad enabled no
libfaad dlopened no
libgsm enabled no
libmp3lame enabled no
libnut enabled no
libogg enabled no
libtheora enabled no
libvorbis enabled no
x264 enabled yes
XviD enabled yes
zlib enabled no
License: GPL
Creating config.mak and config.h...