ffmpeg移植Android方法以及常见问题汇总

1、ffmpeg移植Android方法以及常见问题汇总：在ffmpeg官网下载源码包，比如ffmpeg-2.3。在ffmpeg目录下增加Android.mk和av.mkconfig.sh三个文件。config.sh用于配置ffmpeg环境脚本，可键入#!/bin/shPREBUILT=.android-ndk-r7b/toolchains/arm-linux-androideabi-4.4.3/prebuilt/linux-x86PLATFORM=.android-ndk-r7b/platforms/android-14/arch-armexportTMPDIR=./tmp./configure-

2、target-os=linux-arch=arm-enable-cross-compile-cc=$PREBUILT/bin/arm-linux-androideabi-gcc-4.4.3-cross-prefix=$PREBUILT/bin/arm-linux-androideabi-nm=$PREBUILT/bin/arm-linux-androideabi-nm-extra-cflags=-fPIC-DANDROID-enable-static-disable-shared-disable-asm-disable-yasm-extra-ldflags=-Wl,-T,$PREBUILT/a

3、rm-linux-androideabi/lib/ldscripts/armelf_linux_eabi.x-Wl,-rpath-link=$PLATFORM/usr/lib-L$PLATFORM/usr/lib-nostdlib$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtbegin.o$PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/crtend.o-lc-lm-ldlPREBUILT、PLATFORM、TMPDIR是需要修改的，配置自己的ndk路径，通常这一步出错概率极高。TMPDIR路径一定要

4、存在且可以访问。常见错误：armlinuxandroideabigccisunabletocreateanexecutablefile，000tmp文件没有设置。UnknownCcompiler/toolchains/armlinuxandroideabi4.4.3/prebuilt/windows/bin/armlinuxandroideabigcc,000NDK配置错误。./config.sh:line8:arch:commandnotfound,./configure每一个参数后的转行符号，注意后面不要有空格符，另外也有可能是字符格式错误，要转为unix,在vim里:setff二unix

5、保存退出。否则脚本执行失败。cc、一crossprefix、一nm、一extraldflags注意配置路径要正确，否则脚本执行失败。./configure是配置ffmpeg选项的，可以按个人需求添加删减，不赘述。执行该脚本，如果正确，大约数分钟后执行结束，会自动生成config.h和config.mak。如果执行出错，一般是配置问题。av.mk文件键入include$(LOCAL_PATH)/./config.makOBJS:=OBJS-yes:=MMX-OBJS-yes:=include$(LOCAL_PATH)/Makefile#collectobjectsOBJS-$(HAVE_MMX)

6、+=$(MMX-OBJS-yes)OBJS+=$(OBJS-yes)FFNAME:=lib$(NAME)FFLIBS:=$(foreach,NAME,$(FFLIBS),lib$(NAME)FFCFLAGS=-DHAVE_AV_CONFIG_H-Wno-sign-compare-Wno-switch-Wno-pointer-signFFCFLAGS+=-DTARGET_CONFIG=config-$(TARGET_ARCH).hALL_S_FILES:=$(wildcard$(LOCAL_PATH)/$(TARGET_ARCH)/*.S)ALL_S_FILES:=$(addprefix$(TA

7、RGET_ARCH)/,$(notdir$(ALL_S_FILES)ifneq($(ALL_S_FILES),)ALL_S_OBJS:=$(patsubst%.S,%.o,$(ALL_S_FILES)C_OBJS:=$(filter-out$(ALL_S_OBJS),$(OBJS)S_OBJS:=$(filter$(ALL_S_OBJS),$(OBJS)elseC_OBJS:=$(OBJS)S_OBJS:=endifC_FILES:=$(patsubst%.o,%.c,$(C_OBJS)S_FILES:=$(patsubst%.o,%.S,$(S_OBJS)FFFILES:=$(sort$(S

8、_FILES)$(sort$(C_FILES)即可。在需要编译的目录(不同版本ffmpeg有区别)，比如在libavcodec、ibavdevice、libavfilter、libavformat、libavutil、libpostproc、libswscale、libswresample目录下分别放入一个Android.mk别放入一个Android.mk文件，键入LOCAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)include$(LOCAL_PATH)/./av.mkLOCAL_SRC_FILES:=$(FFFILES)LOCAL_C_INCLUDES

9、:=$(LOCAL_PATH)$(LOCAL_PATH)/.LOCAL_CFLAGS+=$(FFCFLAGS)LOCAL_STATIC_LIBRARIES:=$(FFLIBS)LOCAL_MODULE:=$(FFNAME)include$(BUILD_STATIC_LIBRARY)即可，这几个目录下的Android.mk是一样的。也可以自己配置L0CAL_M0DULE和L0CAL_STATIC_LIBRARIES,不过上述脚本配置简单。然后删除libavcodec、ibavdevice、libavfilter、libavformat、libavutil、libpostproc、libswsca

10、le、libswresample目录下的Makefile中的include$(SUBDIR)./config.mak和include$(SUBDIR)./subdir.mak，后者在2.3版本中并不存在，确保自己的Makefile000D2句就可以了。5.编写Android.mk，放置ffmpeg根目录，即av.mk、config.sh同级目录这里有2个，一个是用于编译libffmpeg.so的脚本，如下：L0CAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)L0CAL_STATIC_LIBRARIES:=libavformatlibavcodeclibav

11、utillibpostproclibswscalelibavfilterlibavdeviceL0CAL_M0DULE_TAGS:=optionalL0CAL_M0DULE:=libffmpeginclude$(BUILD_SHARED_LIBRARY)include$(callall-makefiles-under,$(L0CAL_PATH)也可以写一个生产ffmpeg的执行文件的mk脚本：L0CAL_PATH:=$(callmy-dir)include$(CLEAR_VARS)LOCAL_MODULE_TAGS:=optionalLOCAL_PRELINK_MODULE:=falseLOC

12、AL_SRC_FILES:=cmdutils.cffmpeg.cffmpeg_opt.cffmpeg_filter.cLOCAL_SHARED_LIBRARIES:=libffmpegLOCAL_MODULE:=ffmpeg#include$(BUILD_SHARED_LIBRARY)include$(BUILD_EXECUTABLE)include$(callall-makefiles-under,$(LOCAL_PATH)cmdutils.c和ffmpeg.c,编译后其中，LOCAL_SRC_FILEScmdutils.c和ffmpeg.c,编译后6.常用的移植修改和编译报错因为是移植，所

13、以有些文件必须修改才能编译通过，对config.h修改：老的ffmpeg是将#definerestrictrestrict改为#definerestrict新版本是#defineav_restrictav_restrict改为#defineav_restrict将ffmpeg/libavutil/libm.h中所有static的函数删除。然后编译，如果报错/works/workspace/android-console/jni/ffmpeg.c:3636:19:error:storagesizeofrusageisntknown/works/workspace/android-console/

14、jni/ffmpeg.c:3638:15:error:RUSAGE_SELFundeclared(firstuseinthisfunction)将config.h中#defineHAVE_GETRUSAGE1修改为#defineHAVE_GETRUSAGE0报错/works/workspace/android-console/jni/cmdutils.c:270:19:error:storagesizeofrlisntknown/works/workspace/android-console/jni/cmdutils.c:271:19:error:RLIMIT_CPUundeclared(fi

15、rstuseinthisfunction)将config.h中#defineHAVE_SETRLIMIT1修改为#defineHAVE_SETRLIMIT0报错/works/workspace/android-console/jni/cmdutils.c:41:21:fatalerror:version.h:Nosuchfileordirectory在在ffmpeg根目录下运行./version.sh.version.h报错android-ndk-r8d/build/core/build-binary.mk:41:*targetfilecleanhasboth:and:entries.Stop.把libavfilter目录中的Makefile末尾的clean命令注释掉报错./platforms/android-18/arch-arm/usr/include/stdlib.h:54:14:error:expectedidentifieror(beforevoid./platforms/android-18/arch-arm/usr/inc