https://forum.synology.com/enu/viewtopic.php?f=37&t=64609 

• ipkg update
• ipkg install optware-devel
• ipkg install git
• ipkg install gcc
• ipkg install bash
• git clone git://git.videolan.org/x264
• cd x264
• sed -i 's/^#!.*$/#!\/opt\/bin\/bash/g' configure version.sh
• sh configure --prefix=/opt --enable-shared --disable-asm
• make
• make install
• git clone git://source.ffmpeg.org/ffmpeg.git ffmpeg
• cd ffmpeg
• sed -i 's/^#!.*$/#!\/opt\/bin\/bash/g' configure
• ./configure --enable-shared --enable-gpl --enable-memalign-hack --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --enable-libfaac --disable-armv6 --disable-armv6t2 --disable-ffplay --disable-ffserver --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te
• cp /opt/lib/libx264.so.* /lib
• make
• make install

제가 아직 많이 미숙하지만 윗 글을 보고 진행중이 였습니다.

libx264 까진 어떻게 잘 설치가 되었습니다.

이제 문제는 ffmpeg에서 시작되었습니다.  15번 코드부터 처음엔 unknown option --enable-memalign-hack 이게떠서 찾아보니 윈도우 경우에만 사용된다는

http://greenday96.blogspot.com/2013/07/mingw-ffmpeg-x264-mingw-ffmpeg-with.html 

위의 링크의 글을 보게 되었고 그 옵션을 지웠습니다.

• ./configure --enable-shared --enable-gpl --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --enable-libfaac --disable-armv6 --disable-armv6t2 --disable-ffplay --disable-ffserver --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te

이어서 

• root@JJONG_NAS:~/opt/ffmpeg# ./configure --enable-shared --enable-gpl --enable-memalign-hack --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --enable-libfaac --disable-armv6 --disable-armv6t2 --disable-ffplay --disable-ffserver --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te

  Unknown option "--enable-memalign-hack".

  See ./configure --help for available options.

• root@JJONG_NAS:~/opt/ffmpeg# ./configure --enable-shared --enable-gpl --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --enable-libfaac --disable-armv6 --disable-armv6t2 --disable-ffplay --disable-ffserver --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te
  Unknown option "--enable-libfaac".
  See ./configure --help for available options.

• root@JJONG_NAS:~/opt/ffmpeg# ./configure --enable-shared --enable-gpl --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --disable-armv6 --disable-armv6t2 --disable-ffplay --disable-ffserver --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te
  Unknown option "--disable-ffserver".
  See ./configure --help for available options.

• root@JJONG_NAS:~/opt/ffmpeg# ./configure --enable-shared --enable-gpl --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --disable-armv6 --disable-armv6t2 --disable-ffplay --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te
  gcc is unable to create an executable file.
  If gcc is a cross-compiler, use the --enable-cross-compile option.
  Only do this if you know what cross compiling means.
  C compiler test failed.
  
  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
  ***********@******.org mailing list or IRC #ffmpeg on irc.freenode.net.
  Include the log file "ffbuild/config.log" produced by configure as this will help
  solve the problem.

위 처럼 unknown이 발생할때마다 옵션을 하나씩 제거해보았는 데 결국 C compiler test failed. 뜨고 위의 에러를 보고

• ./configure --enable-shared --enable-gpl --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --disable-armv6 --disable-armv6t2 --disable-ffplay --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te --enable-cross-compile

를 추가해서 해도

• root@JJONG_NAS:~/opt/ffmpeg#  ./configure --enable-shared --enable-gpl --enable-libmp3lame --enable-version3 --enable-nonfree --enable-libx264 --disable-armv6 --disable-armv6t2 --disable-ffplay --prefix=/opt --disable-neon --disable-asm --enable-avcodec --arch=arm --cpu=armv5te --enable-pthreads --disable-decoder=zmbv --target-os=linux --enable-armv5te --enable-cross-compile

  gcc is unable to create an executable file.

  C compiler test failed.

  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

  ***********@******.org mailing list or IRC #ffmpeg on irc.freenode.net.

  Include the log file "ffbuild/config.log" produced by configure as this will help

  solve the problem.

이런 상황인데 어케 해야 하나요? 전에 g530으로 NAS 돌리다 이제 자동으로 x264로 인코딩하는 환경을 만들려고 하는데 막막하네요...

조언 부탁드립니다.