Building FFMPEG with librtmp for android
android, android-ndk, configuration, ffmpeg, rtmp
Solution
This is challenging, but I think I have a solution. The problem at configure-time is that FFmpeg wants to detect a proper librtmp installation via the pkg-config management system.
I'm assuming your have successfully cross-compiled librtmp in the directory referenced by ../rtmpdump. Edit the FFmpeg configure script and search for the line:
enabled librtmp && require_pkg_config librtmp librtmp/rtmp.h RTMP_Socket
Comment that out (put a '#' at the front of the line). Now, re-run configure, only with these modifications:
--extra-cflags="-I/full/path/to/rtmpdump"
It may help to have an absolute path here. Also, omit /librtmp/ at the end since the #include directives already prefix the header files with librtmp/. Next:
--extra-ldflags="-L/full/path/to/rtmpdump -lrtmp"
Again, absolute path, and specify the library to link against since we commented out that logic via configure.
Now, configure should succeed and the cross-compilation should also be happy. The final ffmpeg binary should report the family of RTMP modules under protocols:
ffmpeg -protocols
[...]
rtmp
rtmpe
rtmps
rtmpt
rtmpte
Note that I don't have an NDK dev environment to test this on. But I tested on my desktop Ubuntu system by compiling librtmp (without the package being installed via pkg-config) and then performing the above steps.
Problem
I'm trying to build all-in-one static binary of FFMPEG with NDK r7b and everything works fine untill i try to build it with RTMP support. I'm usind sources from https://github.com/guardianproject/android-ffmpeg with librtmp2.4 and custom config like this ``` .configure \ --target-os=linux \ --cross-prefix=arm-linux-androideabi- \ --arch=arm \ --sysroot=/home/andrey/android-ndk-r7b/platforms/android-3/arch-arm \ --enable-static \ --disable-shared \ --disable-symver \ --enable-small \ --disable-devices \ --disable-avdevice \ --enable-gpl \ --enable-librtmp \ --prefix=../build/ffmpeg/armeabi \ --extra-cflags=-I../rtmpdump/librtmp \ --extra-ldflags=-L../rtmpdump/librtmp \ ``` and rtmpdump directory lays on the same level as ffmpeg. As i understand last two strings in my config says where compiler may find sources of librtmp. But all i get is `ERROR: librtmp not found` I'm not expereienced with NDK and obviosly i missing some important part but i can't find it by myself.