1 获取源代码

git clone -b "branch" https://git.ffmpeg.org/ffmpeg.git

“branch” 可以是以下的master、release/3.1等等，具体看需要使用哪个分支。

4 days ago	release/3.1	shortlog \| log \| tree
4 days ago	release/3.2	shortlog \| log \| tree
4 days ago	release/3.3	shortlog \| log \| tree
3 weeks ago	release/3.0	shortlog \| log \| tree
2 months ago	release/2.8	shortlog \| log \| tree
12 months ago	release/2.7	shortlog \| log \| tree
12 months ago	release/2.6	shortlog \| log \| tree
12 months ago	release/2.5	shortlog \| log \| tree

2 Configure配置

在源码的目录下调用configure脚本，通过 -h 查看相应的帮助，这里写了一个简单的脚本build-ffmpeg.sh；

#!/bin/bash

PREFIX=out

TOOLCHAINS=/mnt/diska/X3399/source/buildroot/output/host/opt/ext-toolchain/bin

CROSS_COMPILE=${TOOLCHAINS}/aarch64-linux-gnu-

LOCAL_PATH=`pwd`

CFLAGS="-Wall -pipe -fpic \

   -finline-limit=300 -ffast-math \

   -fstrict-aliasing -Werror=strict-aliasing \

   -fmodulo-sched -fmodulo-sched-allow-regmoves \

   -Wno-psabi -Wa,--noexecstack"

EXTRA_CFLAGS=

EXTRA_LDFLAGS=

CPU_NAME=cortex-a72

FFMPEG_FLAGS="--prefix=${PREFIX} \

   --target-os=linux \

   --arch=arm \

   --cpu=$CPU_NAME \

   --enable-cross-compile \

   --cross-prefix=${CROSS_COMPILE} \

   --enable-shared \

   --disable-symver \

   --disable-doc \

   --disable-ffplay \

   --disable-ffmpeg \

   --disable-ffprobe \

   --disable-ffserver \

   --disable-avdevice \

   --disable-avfilter \

   --disable-muxers \

   --disable-filters \

   --disable-devices \

   --disable-everything \

   --enable-protocols  \

   --enable-parsers \

   --enable-demuxers \

   --disable-demuxer=sbg \

   --enable-decoders \

   --enable-bsfs \

   --enable-network \

   --enable-swscale  \

   --enable-neon \

   --enable-version3 \

   --disable-yasm \

   --disable-asm"

 #--enable-debug \

 #--disable-stripping \

 #--disable-optimizations \

 ./configure $FFMPEG_FLAGS --extra-cflags="$CFLAGS $EXTRA_CFLAGS" --extra-ldflags="$LDFLAGS $EXTRA_LDFLAGS"

 #make && make install

3 报错处理

如果在根目录下直接执行build-ffmpeg.sh脚本是无法成功安装ffmpeg的，首先这里会出现以下几个问题。

报错1:

错误内容：

{your path to toolchians}/aarch64-linux-gnu-gcc is unable to create an executable file. C compiler test failed.

解决方案：

打开configure文件；

搜索报错内容“C compiler test failed”，定位到以下内容，注释掉 die “C compiler test failed.” 或者修改 if 条件使得条件一直成立也是可以的。

if test "$?" != 0; then

echo "$cc is unable to create an executable file."

if test -z "$cross_prefix" && ! enabled cross_compile ; then

    echo "If $cc is a cross-compiler, use the --enable-cross-compile option."

    echo "Only do this if you know what cross compiling means."

fi

#   die "C compiler test failed."

fi

报错2

错误内容：

If you think configure made a mistake, make sure you are using the latest

version from Git. If the latest version fails, report the problem to the

[email protected] mailing list or IRC #ffmpeg on irc.freenode.net.

Include the log file “config.log” produced by configure as this will help

solve the problem.

解决方案：

和报错1的解决方案类似，需要定位configure文件中的错误信息提示内容，

 die(){

     echolog "$@"

     cat <<EOF

 If you think configure made a mistake, make sure you are using the latest

 version from Git.  If the latest version fails, report the problem to the

 [email protected] mailing list or IRC #ffmpeg on irc.freenode.net.

 EOF

     if disabled logging; then

         cat <<EOF

 Rerun configure with logging enabled (do not use --disable-logging), and

 include the log this produces with your report.

 EOF

     else

         cat <<EOF

 Include the log file "$logfile" produced by configure as this will help

 solve the problem.

 EOF

     fi

 #    exit 1

 }

简单粗暴一点将exit 1直接注释掉，这样就不会退出了，但是会遇到什么问题不得而知，至少目前可以成功安装了。

报错3

错误内容：

aarch64-linux-gnu-gcc: error: missing argument to ‘-mcpu=’

解决方案：

configure 参数中加入 –cpu=$CPU_NAME 选项

4 At last

最后将out文件夹下的文件copy到目标板上即可

ago

Linux下ffmpeg交叉编译

1 获取源代码

2 Configure配置

3 报错处理

报错1:

报错2

报错3

4 At last