“未定义的参考”当在Android上使用librtmp编译FFMPEG时 [英] "Undefined Reference" when compiling FFMPEG with librtmp on Android

问题描述

我已经搜索过，而使用librtmp for android构建FFMPEG 回答在我的问题的一部分，我在编译过程中进一步遇到了其他问题。

I have searched, and while Building FFMPEG with librtmp for android answered part of my question, I ran into other issues further along in the compilation process.

首先，我试图在这个github repo ，将标志更改为包含

First, I am trying to use the script in this github repo, changing the flags to include

  --enable-librtmp \
  --extra-cflags=-I/home/bradford/Development/FFMPEG/rtmp/rtmpdump/librtmp/ \
  --extra-ldflags=-L/home/bradford/Development/FFMPEG/rtmp/rtmpdump/librtmp"

我使用polarSSL在S74ck3r的他的github repo 和流记录器线程。这似乎正常工作，我有一个librtmp.so，librtmp.a和rtmp.h

I build librtmp with polarSSL following S74ck3r's instructions on his github repo and stream-recorder thread. That appears to work correctly, and I have a librtmp.so, librtmp.a and rtmp.h

当我尝试使用librtmp编译ffmpeg时，我收到错误

When I try to compile ffmpeg with librtmp, I get the error

ERROR: librtmp not found

这个SO问题帮助，我修改了ffmpeg的配置文件，以便它不会看到pkg-config的librtmp（即使pkg-config知道librtmp ...）：

This SO question helped, and I modified ffmpeg's config file so that it wouldn't look at pkg-config for librtmp (even though pkg-config was aware of librtmp...):

#enabled librtmp    && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket

当我建立起来，它开始成功，我得到希望的行：

When I build now, it starts successfully, and I get the hopeful line:

librtmp enabled           yes

稍后我看到更多的好消息：

And later on I see more good news:

...
Enabled protocols:
applehttp       http            mmsh
cache           httpproxy       mmst
concat          librtmp         mmsu
crypto          librtmpe        pipe
fd          librtmps        rtp
file            librtmpt        tcp
gopher          librtmpte       udp
hls         md5
...

但是最后，在编译一切和在安装阶段，我收到以下类型的错误：

but finally, after compiling everything and during the installation phase, I get these types of errors:

INSTALL   libavutil/libavutil.pc
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_get_file_handle:libavformat/librtmp.c:190: error: undefined reference to 'RTMP_Socket'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_read_seek:libavformat/librtmp.c:180: error: undefined reference to 'RTMP_SendSeek'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_read_pause:libavformat/librtmp.c:161: error: undefined reference to 'RTMP_Pause'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_close:libavformat/librtmp.c:64: error: undefined reference to 'RTMP_Close'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_write:libavformat/librtmp.c:145: error: undefined reference to 'RTMP_Write'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_read:libavformat/librtmp.c:153: error: undefined reference to 'RTMP_Read'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_open:libavformat/librtmp.c:96: error: undefined reference to 'RTMP_LogSetLevel'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_open:libavformat/librtmp.c:97: error: undefined reference to 'RTMP_LogSetCallback'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_open:libavformat/librtmp.c:118: error: undefined reference to 'RTMP_Init'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_open:libavformat/librtmp.c:119: error: undefined reference to 'RTMP_SetupURL'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_open:libavformat/librtmp.c:127: error: undefined reference to 'RTMP_Connect'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_open:libavformat/librtmp.c:127: error: undefined reference to 'RTMP_ConnectStream'
/tmp/FFMPEG/bin/../lib/gcc/arm-linux-androideabi/4.6/../../../../arm-linux-androideabi/bin/ld: libavformat/librtmp.o: in function rtmp_open:libavformat/librtmp.c:125: error: undefined reference to 'RTMP_EnableWrite'
collect2: ld returned 1 exit status

我不能超过他们。它听起来像是找不到rtmp.h，其中包括对这些函数的引用，但是它应该是（afaik）。

And I can't get past them. It sounds like it can't find rtmp.h, which includes references to those functions, but that is present where it should be (afaik).

另外，我的项目需要librtmp - ffmpeg的内置rtmp功能是不够的，因为我需要librtmp的身份验证功能。

Also, my project requires librtmp - the built-in rtmp features of ffmpeg are not sufficient because I require the authentication features of librtmp.

推荐答案

记录我的程序，使用librtmp for Android成功构建FFmpeg 2.1.3。

I've documented my process of successfully building FFmpeg 2.1.3 with librtmp for Android.

简而言之，一旦建立Open / PolarSSL和librtmp，请下载最新的FFmpeg发布，并对FFmpeg的配置进行以下更改：：

Briefly, once you build Open/PolarSSL and librtmp, download the latest FFmpeg release and make the following changes to FFmpeg's configure:

# ffmpegX.X.X/configure
...
# Replace the following lines:

#SLIBNAME_WITH_MAJOR='$(SLIBNAME).$(LIBMAJOR)'
#LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
#SLIB_INSTALL_NAME='$(SLIBNAME_WITH_VERSION)'
#SLIB_INSTALL_LINKS='$(SLIBNAME_WITH_MAJOR) $(SLIBNAME)'

# With: 

SLIBNAME_WITH_MAJOR='$(SLIBPREF)$(FULLNAME)-$(LIBMAJOR)$(SLIBSUF)'
LIB_INSTALL_EXTRA_CMD='$$(RANLIB) "$(LIBDIR)/$(LIBNAME)"'
SLIB_INSTALL_NAME='$(SLIBNAME_WITH_MAJOR)'
SLIB_INSTALL_LINKS='$(SLIBNAME)'

...

# Replace this:
#enabled librtmp    && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket
# With:
enabled librtmp    && require librtmp librtmp/rtmp.h RTMP_Socket -L/path/to/rtmpdump/librtmp/android/arm/lib -lrtmp

然后使用以下构建脚本编译FFmpeg：

Then use the following build script to compile FFmpeg:

# ffmpegX.X.X/build_ffmpeg_with_librtmp_for_android.sh
#!/bin/bash
NDK=/path/to/android-ndk-r9c
SYSROOT=$NDK/platforms/android-19/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.8/prebuilt/darwin-x86_64

OPENSSL_DIR=/path/to/openssl-android/
LIBRTMP_DIR=/path/to/rtmpdump/librtmp/
# Note: Change above variables to match your system
function build_one
{
./configure \
    --prefix=$PREFIX \
    --enable-librtmp \
    --enable-shared \
    --disable-static \
    --disable-doc \
    --disable-programs \
    --disable-doc \
    --disable-symver \
    --cross-prefix=$TOOLCHAIN/bin/arm-linux-androideabi- \
    --target-os=linux \
    --arch=arm \
    --enable-cross-compile \
    --sysroot=$SYSROOT \
    --extra-cflags="-Os -fpic $ADDI_CFLAGS" \
    --extra-ldflags="$ADDI_LDFLAGS" \
    $ADDITIONAL_CONFIGURE_FLAG
make clean
make -j8
make install
}
CPU=arm
PREFIX=$(pwd)/android/$CPU 
ADDI_CFLAGS="-marm -I${OPENSSL_DIR}include -I${LIBRTMP_DIR}android/arm/include -L${LIBRTMP_DIR}android/arm/lib -lrtmp"
ADDI_LFLAGS="-L${OPENSSL_DIR}libs/armeabi -L${LIBRTMP_DIR}android/arm/lib -lrtmp" 
build_one

感谢我的朋友 Chris 帮助我。

这篇关于“未定义的参考”当在Android上使用librtmp编译FFMPEG时的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！