I spent several days trying to compile ffmpeg on android-ndk1.5. Just want to share to others. Hopefully, it can save you some time.
STEP1:
First, I get the source code from ~olvaffe/ffmpeg/ffmpeg-android. I will need to use its *.mk files.
STEP2:
Get the ffmpeg source code from I used svn, instead of git, so that I won’t need to get libswscale separately.
STEP3:
configure my ffmpeg with following cmd.
#!/bin/sh
PREBUILT=/home/myhome/android-ndk/build/prebuilt/linux-x86/arm-eabi-4.2.1
./configure
–target-os=linux \
–arch=armv41 \
–enable-cross-compile
\
–cc=$PREBUILT/bin/arm-eabi-gcc \
–cross-prefix=$PREBUILT/bin/arm-eabi-
\
–nm=$PREBUILT/bin/arm-eabi-nm \
–extra-cflags=”-fPIC -DANDROID ”
\
–enable-static \
–disable-shared \
–disable-asm \
–disable-yasm
\
–prefix=/home/myhome/work/ffmpeg-android-bin
\
–extra-ldflags=”-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.x
-Wl,-rpath-link=/home/myhome/android-ndk/build/platforms/android-1.5/arch-arm/usr/lib
-L/home/myhome/android-ndk/build/platforms/android-1.5/arch-arm/usr/lib
-nostdlib
/home/myhome/android-ndk/build/prebuilt/linux-x86/arm-eabi-4.2.1/lib/gcc/arm-eabi/4.2.1/crtbegin.o
/home/myhome/android-ndk/build/prebuilt/linux-x86/arm-eabi-4.2.1/lib/gcc/arm-eabi/4.2.1/crtend.o
-lc -lm -ldl”
** I referenced this one at http://blog.csdn.net/anakiagmail/archive/2009/08/14/4446986.aspx ** If you don’t understand chinese, I’ll show you what it describe in following steps.
STEP4:
By now, configure should be passed successfully. Copy *.mk from olvaffe’s ffmpeg source tree to your ffmpeg-original source tree. There should be a Android.mk, av.mk under ffmpeg root dir. And, Android.mk under each libavcodec, libavutil, libavformat, libpostproc, libswscale dirs. If you don’t have Android.mk under libswscale/libpostproc, just copy one from libavutil. I don’t use libavdevice, so I just ignore it. Then, comment out all config.mak & subdir.mak in */Makefile.
STEP5:
cd to your NDK root dir, type make TARGET_ARCH=arm APP=ffmpeg-org
STEP6:
you should have a lot of compilation errors. That’s okay. I’ll show you how to fix them.
* edit libavutil/internal.h, comment out all error func(s).
* comment out all “restrict” keyword related “restrict” errors. They should
in libavcodec/dsputil.h, libavformat/rtpenc_h263.c,
libavcodec/dnxhdenc.c,
libavcodec/dsputil.c, libavcodec/ituh263dec.c,
libavcodec/mpegvideo.c.
Try make again, and here we go. Those static *.a files are now in your NDK_ROOT/out/apps/ffmpeg-org/android-1.5-arm/.
=======================================================================
I spent several days trying to compile ffmpeg on android-ndk1.5. Just want to share to others. Hopefully, it can save you some time.
STEP1:
First, I get the source code from ~olvaffe/ffmpeg/ffmpeg-android. I will need to use its *.mk files.
STEP2:
Get the ffmpeg source code from I used svn, instead of git, so that I won’t need to get libswscale separately.
STEP3:
configure my ffmpeg with following cmd.
#!/bin/sh
PREBUILT=/home/myhome/android-ndk/build/prebuilt/linux-x86/arm-eabi-4.2.1
./configure –target-os=linux \
–arch=armv41 \
–enable-cross-compile \
–cc=$PREBUILT/bin/arm-eabi-gcc \
–cross-prefix=$PREBUILT/bin/arm-eabi- \
–nm=$PREBUILT/bin/arm-eabi-nm \
–extra-cflags=”-fPIC -DANDROID ” \
–enable-static \
–disable-shared \
–disable-asm \
–disable-yasm \
–prefix=/home/myhome/work/ffmpeg-android-bin \
–extra-ldflags=”-Wl,-T,$PREBUILT/arm-eabi/lib/ldscripts/armelf.x
-Wl,-rpath-link=/home/myhome/android-ndk/build/platforms/android-1.5/arch-arm/usr/lib
-L/home/myhome/android-ndk/build/platforms/android-1.5/arch-arm/usr/lib
-nostdlib
/home/myhome/android-ndk/build/prebuilt/linux-x86/arm-eabi-4.2.1/lib/gcc/arm-eabi/4.2.1/crtbegin.o
/home/myhome/android-ndk/build/prebuilt/linux-x86/arm-eabi-4.2.1/lib/gcc/arm-eabi/4.2.1/crtend.o
-lc -lm -ldl”
** I referenced this one at http://blog.csdn.net/anakiagmail/archive/2009/08/14/4446986.aspx ** If you don’t understand chinese, I’ll show you what it describe in following steps.
STEP4:
By now, configure should be passed successfully. Copy *.mk from olvaffe’s ffmpeg source tree to your ffmpeg-original source tree. There should be a Android.mk, av.mk under ffmpeg root dir. And, Android.mk under each libavcodec, libavutil, libavformat, libpostproc, libswscale dirs. If you don’t have Android.mk under libswscale/libpostproc, just copy one from libavutil. I don’t use libavdevice, so I just ignore it. Then, comment out all config.mak & subdir.mak in */Makefile.
STEP5:
cd to your NDK root dir, type make TARGET_ARCH=arm APP=ffmpeg-org
STEP6:
you should have a lot of compilation errors. That’s okay. I’ll show you how to fix them.
* edit libavutil/internal.h, comment out all error func(s).
* comment out all “restrict” keyword related “restrict” errors. They
should in libavcodec/dsputil.h, libavformat/rtpenc_h263.c,
libavcodec/dnxhdenc.c,
libavcodec/dsputil.c, libavcodec/ituh263dec.c, libavcodec/mpegvideo.c.
Try make again, and here we go. Those static *.a files are now in your NDK_ROOT/out/apps/ffmpeg-org/android-1.5-arm/.
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编译出来的静态库可以用吗？我在一个动态 库里面调用ffmpeg里面的功能，提示undefined reference to ***这样的错误。同时发现，那些libavcodec.a什么的确实都生成了，并且指向的路径也对，不知道什么原因。
Thanks for this tutorial!
But I am not sure how to realize step 4 to step 5. What is your folder structure in ~/android-ndk/app did you check out the source code in
~/android-ndk/app/ffmpeg-org or did you a symbolic link?
So I was only able to realize your tutorial to step 4.
. I am using android-ndk release 3.
best regards Matthias
as long as there is a ffmpeg-org under your android-ndk/sources, doesn’t matter it is symbolic link or not. And under your android-ndk/apps/, there is a ffmpeg-org dir too. So, under android-ndk root dir, you just need to type “make APP=ffmpeg-org” cmd.
There’s gotta be a better way than commenting out the restrict qualifier everywhere. Anybody figure out a way to get around this in one of the config files?
I tryed step 3, but it says :
/Users/jb/Documents/android/android-ndk-r3/build/prebuilt/darwin-x86/arm-eabi-4.2.1/bin/arm-eabi-gcc is unable to create an executable file.
C compiler test failed.
I don’t understand why…
can anyone help me ?
On step 5, I got the error
“Android NDK: The APP variable contains unknown app names: ffmpeg-org
Android NDK: Please use one of: hello-gl2 hello-jni san-angeles two-libs unit-tests “.
So I ignored it and do the step 6, but when I try to make again, the error still there.
Please help on this issue.
under your $Android-NDK-root/apps/, there should be a “ffmpeg-org” dir. and under ffmpeg-org, you will need to have a Application.mk. Please read Android-NDK tutorial/doc
I don’t understand how to make understand the compiler that it will not result in an executable program… : “… is unable to create an executable file…”
How did you manage that ??
Thanks for the help