移植ffmpeg至海思平台

一、xvid、x264、ffmpeg源码下载

链接：https://pan.baidu.com/s/13phSFrLqkGrKDGF3_a2cSA
提取码：ls2s

二、交叉编译

1. xvid

1. tar zxvf xvidcore-1.3.3.tar.gz
2. cd xvidcore/build/generic
3. ./configure --prefix=/home/workspace/arm_soft/ --host=arm-hisiv100nptl-linux --target=arm-linux
4. make -j 8
5. make install
   

xvidcore-1.1.3这个版本有点问题，后面编译ffmpeg的时候会提示找不到 libxvid，但还是记录下。

make 出现错误

root@chenwr-pc:/home/workspace/soft/ffmpeg/xvidcore-1.1.3/build/generic# make
  D: =build
  C: ./decoder.c
cc1: error: unrecognized command line option "-freduce-all-givs"

编辑configure 搜索freduce 这两处屏蔽掉


make -j 8
make install

2. x264

1. tar jxvf last_x264.tar.bz2
2. cd x264-snapshot-20161225-2245
3. ./configure --prefix=/home/workspace/arm_soft --host=arm-hisiv100nptl-linux --enable-shared --disable-asm
4. 修改config.mak
   修改内容如下：
   CC=gcc 改为 CC=arm-hisiv100nptl-linux-gcc
   LD=gcc -o 改为 LD=arm-hisiv100nptl-linux-gcc -o
   RANLIB=ranlib 改为 RANLIB=arm-hisiv100nptl-linux-ranlib
   STRIP=strip 改为 STRIP=arm-hisiv100nptl-linux-strip
5. 修改common目录下的cpu.c文件，详情见错误记录
6. make -j 8
7. make install

错误记录：

make出现错误

libx264.a(cpu.o): In function `x264_cpu_num_processors':
cpu.c:(.text+0x44): undefined reference to `CPU_COUNT'
collect2: ld returned 1 exit status

解决办法：
修改common目录下的cpu.c文件，搜索关键字x264_cpu_num_processors，屏蔽CPU_COUNT，具体如图所示。

编译成功

3. ffmpeg

1. tar jxvf ffmpeg-3.0.2.tar.bz2
2. cd ffmpeg-3.0.2/
3. ./configure --prefix=/home/workspace/arm_soft/ffmpeg --disable-static --enable-shared --disable-debug --disable-asm --disable-ffplay --disable-ffprobe --disable-ffserver --enable-small --disable-doc --enable-demuxer=rtsp --enable-parser=h264 --enable-cross-compile --enable-libx264 --enable-libxvid --enable-nonfree --enable-gpl --arch=arm --target-os=linux --cross-prefix=arm-hisiv100nptl-linux- --extra-cflags=-I/home/workspace/arm_soft/include --extra-ldflags=-L/home/workspace/arm_soft/lib
4. make -j 8
5. make install

错误记录：

libavcodec/libx264.c: In function 'X264_frame':
libavcodec/libx264.c:271: error: 'x264_bit_depth' undeclared (first use in this function)
libavcodec/libx264.c:271: error: (Each undeclared identifier is reported only once
libavcodec/libx264.c:271: error: for each function it appears in.)
libavcodec/libx264.c:371: warning: 'coded_frame' is deprecated (declared at libavcodec/avcodec.h:2945)
libavcodec/libx264.c:381: warning: 'coded_frame' is deprecated (declared at libavcodec/avcodec.h:2945)
libavcodec/libx264.c: In function 'X264_init':
libavcodec/libx264.c:539: warning: 'chromaoffset' is deprecated (declared at libavcodec/avcodec.h:2210)
libavcodec/libx264.c:540: warning: 'chromaoffset' is deprecated (declared at libavcodec/avcodec.h:2210)
libavcodec/libx264.c:553: warning: 'scenechange_threshold' is deprecated (declared at libavcodec/avcodec.h:2108)
libavcodec/libx264.c:554: warning: 'scenechange_threshold' is deprecated (declared at libavcodec/avcodec.h:2108)
libavcodec/libx264.c:600: warning: 'noise_reduction' is deprecated (declared at libavcodec/avcodec.h:2112)
libavcodec/libx264.c:601: warning: 'noise_reduction' is deprecated (declared at libavcodec/avcodec.h:2112)
libavcodec/libx264.c:610: warning: 'b_frame_strategy' is deprecated (declared at libavcodec/avcodec.h:1830)
libavcodec/libx264.c:611: warning: 'b_frame_strategy' is deprecated (declared at libavcodec/avcodec.h:1830)
libavcodec/libx264.c:618: warning: 'coder_type' is deprecated (declared at libavcodec/avcodec.h:2576)
libavcodec/libx264.c:619: warning: 'coder_type' is deprecated (declared at libavcodec/avcodec.h:2576)
libavcodec/libx264.c:715: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:717: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:719: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:721: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c:723: warning: 'me_method' is deprecated (declared at libavcodec/avcodec.h:1759)
libavcodec/libx264.c: In function 'X264_init_static':
libavcodec/libx264.c:898: error: 'x264_bit_depth' undeclared (first use in this function)
make: *** [libavcodec/libx264.o] Error 1
make: *** Waiting for unfinished jobs....

定位到报错的源码位置

在我交叉编译x264 make install成功的/home/workspace/arm_soft目录下搜索x264_bit_depth，发现有定义，但是是大写的。

原来是海思编译器的问题，没有去区分大小写，于是在x264_config.h新增一个小写的宏定义

编译成功。

ffmpeg configure选项说明，转发了一个整理很不错的博客，参考该博客，根据自己实际需求去配置相关编解码器就好了。

ffmpeg configure配置选项 - chenwr2018的博客 - CSDN博客 https://blog.csdn.net/chenwr2018/article/details/101023811

三、验证

将ffmpeg x264 xvid 相关的include与lib拷贝到设备上。由于我没有裁剪，并且设备根目录空间有限，暂时拷贝到U盘，先测试下转码功能是否ok。

设置好环境变量：

export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:/mnt/udisk/ffmpeg/lib
export PATH=$PATH:/mnt/udisk/ffmpeg/include:/mnt/udisk/ffmpeg/bin

在开发板进行测试

成功压缩视频文件

来源：https://blog.csdn.net/chenwr2018/article/details/101035310