FFmpeg编译

本页的FFMPEG版本n0.9，x264版本(snapshot-20130606-2245)

1】本地跟踪调试（用于本地跟踪调试，开启了debug，关闭了编译器优化）

./configure --disable-asm --disable-optimizations --disable-yasm --enable-encoder=libx264 --enable-libx264 --enable-gpl --enable-static --enable-debug

2】本地裁剪编译

为FFmpeg安装x264编码器

1)首先安装x264，

./configure --enable-shared --enable-static

2)安装ffmpeg

./configure --disable-yasm --enable-libx264 --enable-gpl

裁剪FFMPEG

1）粗略裁剪配置

./configure --disable-everything --disable-muxers --disable-avdevice --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-armvfp --disable-zlib --disable-bzlib --disable-debug --disable-ffmpeg --disable-ffserver --disable-ffplay --disable-filters --disable-devices --disable-encoders --disable-hwaccels --enable-static --enable-memalign-hack --enable-small --enable-demuxers --enable-parsers --enable-protocols --disable-yasm --enable-libx264 --enable-gpl --enable-muxer=mp4 --enable-encoder=aac --enable-encoder=libx264

2）AAC encoder + H264 Encoder --> MP4裁剪配置

./configure --disable-everything --disable-muxers --disable-avdevice --disable-armv5te --disable-armv6 --disable-armv6t2 --disable-armvfp --disable-zlib --disable-bzlib --disable-debug --disable-ffmpeg --disable-ffserver --disable-ffplay --disable-filters --disable-devices --disable-encoders --disable-hwaccels --enable-static --enable-small --disable-demuxers --enable-demuxer=mp4 --disable-parsers --enable-parser=aac --enable-parser=h264 --disable-yasm --enable-libx264 --enable-gpl --enable-muxer=mp4 --enable-encoder=aac --enable-encoder=libx264 --enable-protocol=file

3】交叉编译

x264

CC=arm-hisiv200-linux-gnueabi-gcc ./configure --host=arm-linux --prefix=/usr/local/arm-x264 --enable-shared --disable-asm --enable-static

FFMPEG

LDFLAGS=-L/usr/local/arm-x264/lib/ CFLAGS=-I/home/iskey/work/x264-arm-hisi/ ./configure --disable-everything --disable-muxers --disable-avdevice --disable-zlib --disable-bzlib --disable-debug --disable-ffmpeg --disable-ffserver --disable-ffplay --disable-filters --disable-devices --disable-encoders --disable-hwaccels --enable-static --enable-small --disable-demuxers --enable-demuxer=mp4 --disable-parsers --enable-parser=aac --enable-parser=h264 --disable-yasm --enable-libx264 --enable-gpl --enable-muxer=mp4 --enable-encoder=aac --enable-encoder=libx264 --enable-protocol=file --target-os=linux --arch=arm --enable-cross-compile --cross-prefix=arm-hisiv200-linux-gnueabi- --cc=arm-hisiv200-linux-gnueabi-gcc

 

4】遇到的问题

1）利用前边生成的库文件，编写程序时，出现如下错误

libswscale.a(utils.o): in function sws_init_context:libswscale/utils.c:791: error: undefined reference to 'av_get_cpu_flags'
libswscale.a(swscale.o): in function swScale:libswscale/swscale.c:2588: error: undefined reference to 'av_get_cpu_flags'

原因及解决：由于链接顺序造成，把lavutil放在链接库最后，问题解决。