解决(ARM64-ARMV8)嵌入式Linux系统下X264编码提示：libx264 ：use cpu capability none！

一、开发环境介绍

X264库的版本: x264-snapshot-20181217-2245

开发板：友善之臂 RK3399

RK3399芯片是国内优秀芯片厂商瑞芯微的六核64位芯片。

开发板运行的系统是: FriendlyDesktop ubuntu系统。

开发板的官网使用介绍链接：http://wiki.friendlyarm.com/wiki/index.php/NanoPC-T4/zh#FriendlyDesktop.E7.B3.BB.E7.BB.9F.E7.9A.84.E4.BD.BF.E7.94.A8

二、编译NASM

下载NASM库: http://distfiles.macports.org/nasm/

下载nasm-2.14.02 .tar.bz2 进行解压。

nasm-2.14.02CSDN下载地址: https://download.csdn.net/download/xiaolong1126626497/12339734

注意: 下面代码是直接在RK3399系统里运行的，不是在PC电脑上，使用的编译器是aarch64-linux-gcc

aarch64位的编译器下载地址: https://download.csdn.net/download/xiaolong1126626497/12203205

编译安装NASM库示例：

wbyq@wbyq:~$ tar xvf nasm-2.14.02 .tar.bz2
wbyq@wbyq:~$ ./configure
wbyq@wbyq:~$ make
wbyq@wbyq:~$ sudo make install

三、编译X264

下载x264库：https://download.csdn.net/download/xiaolong1126626497/12339693

编译x264库：

wbyq@wbyq:~$ ./configure --prefix=$PWD/_install --enable-static --enable-shared
wbyq@wbyq:~$ make && make install

编码运行时提示：

[libx264 @ 0x7f34004aa0] using cpu capabilities: ARMv8 NEON [libx264 @ 0x7f34004aa0] profile High, level 2.2, 4:2:0, 8-bit [libx264 @ 0x7f34004aa0] 264 - core 157 - H.264/MPEG-4 AVC codec - Copyleft 2003-2018 - http://www.videolan.org/x264.html - options: cabac=1 ref=1 deblock=1:0:0 analyse=0x3:0x3 me=dia subme=1 psy=1 psy_rd=1.00:0.00 mixed_ref=0 me_range=16 chroma_me=1 trellis=0 8x8dct=1 cqm=0 deadzone=21,11 fast_pskip=1 chroma_qp_offset=0 threads=9 lookahead_threads=1 sliced_threads=0 nr=0 decimate=1 interlaced=0 bluray_compat=0 constrained_intra=0 bframes=0 weightp=1 keyint=10 keyint_min=1 scenecut=40 intra_refresh=0 rc=abr mbtree=0 bitrate=400 ratetol=1.0 qcomp=0.60 qpmin=10 qpmax=51 qpstep=4 ip_ratio=1.40 aq=1:1.00

X264库编译好之后，就可以编译FFMPEG库了。

编译好的ffmpeg库下载地址: https://download.csdn.net/download/xiaolong1126626497/12339799

wbyq@wbyq:~/work/rk3399/ffmpeg-4.2.2$ make clean
wbyq@wbyq:~/work/rk3399/ffmpeg-4.2.2$ ./configure --enable-shared --enable-static --prefix=$PWD/_install --enable-gpl --enable-ffmpeg --enable-libx264 --extra-cflags=-I/home/wbyq/work/rk3399/x264-snapshot-20181217-2245/_install/include --extra-ldflags=-L/home/wbyq/work/rk3399/x264-snapshot-20181217-2245/_install/lib
wbyq@wbyq:~/work/rk3399/ffmpeg-4.2.2$ make && make install