FFmpeg 3.2.4 + libx264 Windows compilation summary

___________________________ compilation Environment __________________________________

NDK Environment: android-ndk-r13b

MinGW Environment: Basic setup under Mark all projects, ffmpeg need to use Msys environment to compile

ffmpeg:3.2.4

libx264: Latest website

_____________________________________________________________________

___________________________ Compiling configuration ___________________________________

Create a new sh file under the extracted FFmpeg directory and fill in the following content

The key variable setting is the NDK path

 #!/bin/bash ndk=e:/android-ndk-r13bsysroot= $NDK/platforms/android-19/arch-arm/toolchain= $NDK/toolchains/      Arm-linux-androideabi-4.9/prebuilt/windows-x86_64function build_one {./configure--prefix= $PREFIX--enable-asm --enable-neon--enable-static--enable-small--disable-shared--disable-ffmpeg--DISABLE-FFP Lay--disable-ffprobe--disable-ffserver--disable-avdevice--disable-doc--disable-symver- -cross-prefix= $TOOLCHAIN/bin/arm-linux-androideabi---target-os=linux--arch=arm--cpu=armv7-a--enabl E-cross-compile--sysroot= $SYSROOT--extra-cflags= "-fpic-dandroid-mfpu=neon-mfloat-abi=softfp-i$ndk/platform  S/android-19/arch-arm/usr/include "--extra-ldflags=" $ADDI _ldflags "make, make, make install} Cpu=arm prefix=$ (pwd)/android/$CPU addi_cflags= "-marm" Build_one 

The

comes with a compile script that joins the libx264 library (extra_lib points to the libx264 compiled directory, including header files [include] and static library [LIB] folders):

#!/bin/bash ndk=e:/android-ndk-r13bsysroot= $NDK/platforms/android-19/arch-arm/toolchain= $NDK/toolchains/ Arm-linux-androideabi-4.9/prebuilt/windows-x86_64extra_lib=e:/ffmpeg/android-libfunction Build_one {./configure- -prefix= $PREFIX--enable-asm--enable-neon--enable-static--enable-small--enable-libx264- -ENABLE-GPL--enable-encoder=libx264--disable-shared--disable-doc--disable-ffmpeg--disable-ff Play--disable-ffprobe--disable-ffserver--disable-avdevice--disable-symver--cross-prefix= $TOO      lchain/bin/arm-linux-androideabi---target-os=linux--arch=arm--cpu=armv7-a--enable-cross-compile --sysroot= $SYSROOT--extra-cflags= "-I$EXTRA_LIB/INCLUDE-FPIC-DANDROID-MFPU=NEON-MFLOAT-ABI=SOFTFP-I$NDK/PLATF      Orms/android-19/arch-arm/usr/include "--extra-ldflags="-l$extra_lib/lib-lx264 $ADDI _ldflags "Make clean Make make install} cpu=arm prefix=$ (PWD)/android/x264_lib/$CPU addi_cflags= "-marm" Build_one 

After compiling, Eclipse creates a new project, adds C + + library support, writes a Java JNI interface, and, under the bin classes directory, uses Javah to generate the header file.

Attach the main implementation code, as well as two compiled MK file notation:

Android.mk

Local_path: = $ (call my-dir) # Prepare Libxinclude $ (clear_vars) Target_arch_abi: = armeabi-v7alocal_export_c_includes: = $ (local_path)/includelocal_module: = avcodeclocal_src_files: = Libavcodec.ainclude $ (prebuilt_static_library) # Prepare Libxinclude $ (clear_vars) Target_arch_abi: = Armeabi-v7alocal_export_c_includes: = $ (Local_path)/includeLOCAL _module: = avfilterlocal_src_files: = Libavfilter.ainclude $ (prebuilt_static_library) # Prepare Libxinclude $ (CLEAR_VAR S) Target_arch_abi: = Armeabi-v7alocal_export_c_includes: = $ (local_path)/includelocal_module: = AvformatLOCAL_SRC_ FILES: = Libavformat.ainclude $ (prebuilt_static_library) # Prepare Libxinclude $ (clear_vars) Target_arch_abi: = Armeabi-v7alocal_export_c_includes: = $ (local_path)/includelocal_module: = Avutillocal_src_files: = Libavutil.ainclude $ (prebuilt_static_library) # Prepare Libxinclude $ (clear_vars) Target_arch_abi: = Armeabi-v7aLOCAL_ Export_c_includes: = $ (local_path)/includelocal_module: = Postproclocal_src_fileS: = Libpostproc.ainclude $ (prebuilt_static_library) # Prepare Libxinclude $ (clear_vars) Target_arch_abi: = Armeabi-v7alocal_export_c_includes: = $ (local_path)/includelocal_module: = Swresamplelocal_src_files: = Libswresample.ainclude $ (prebuilt_static_library) # Prepare Libxinclude $ (clear_vars) Target_arch_abi: = Armeabi-v7alocal_export_c_includes: = $ (local_path)/includelocal_module: = Swscalelocal_src_files: = Libswscale.ainclude $ (prebuilt_static_library) # Prepare Libxinclude $ (clear_vars) Target_arch_abi: = Armeabi-v7aLOCAL _export_c_includes: = $ (local_path)/includelocal_module: = x264local_src_files: = Libx264.ainclude $ (PREBUILT_STATIC_ LIBRARY) include $ (clear_vars) Target_arch_abi: = Armeabi-v7alocal_module: = nativeapptestlocal_src_files: = Nativeapptest.cpplocal_c_includes + = $ (local_path)/includelocal_cflags: =-d__stdc_constant_macros- Wno-sign-compare-wno-switch-wno-pointer-sign-dhave_neon=1-mfpu=neon-mfloat-abi=softfp-fpic-dandroidlocal_ Static_libraries:= Avfilter Avformat avcodec postproc swresample swscale avutil x264local_ldlibs: =-l$ (ndk_root)/platforms/$ (APP_PLATF ORM)/arch-arm/usr/lib-l$ (Local_path)-llog-ljnigraphics-lz-ldlinclude $ (build_shared_library)

Application.mk

App_stl: = gnustl_staticapp_ldflags: =-latomicapp_abi: = armeabi-v7aapp_platform: = android-19

NativeApp.cpp (because FFmpeg is a pure C implementation, so when referring to the header in the CPP file, add [extern "C"] package) Otherwise the compilation will appear the following error:

jni/nativeapptest.cpp:21:error:undefined reference to ' avcodec_configuration () ' Clang++.exe:error:linker command Failed with exit code 1 (use-v to see invocation) Make: * * * [obj/local/armeabi-v7a/libnativeapptest.so] Error 1

#include <jni.h>extern "C"{#include"libavcodec/avcodec.h"} #include<com_ltz_nativeapptest_anative_DoInFastMode.h>/** Class:com_ltz_nativeapptest_anative_doinfastmode * method:getversion * Signature: () I*/jniexport jint jnicall java_com_ltz_nativeapptest_anative_doinfastmode_getversion (jnienv*, Jclass) {    return 0;} Jniexport jstring jnicalljava_com_ltz_nativeapptest_anative_doinfastmode_getcfg (JNIEnv*env, Jclass) {    //TODO    Charinfo[10000] = {0}; sprintf (Info,"%s\n", Avcodec_configuration ()); returnEnv->Newstringutf (info);}

In addition, the JNI directory structure is attached:

______________________________ Failure Part Summary ________________________________________

FFmpeg uses the latest code from the Master branch, with the NDK r10c and r13b having a confusing error in compiling AVCODEC:

1 is the Search_for_ms function in the aaccoder.c file that initializes the B0,B1 report symbol error. Suspect variable name and macro conflict, so instead of BC0,BC1, change the file compiled by.

2: Macro definitions for HEVC_MVS.C files

#define TAB_MVF_PU (v)                                                       TAB_MVF ((((x # # V) >> s->ps.sps->log2_min_pu_size), ((                                 y # # V) >> s-> Ps.sps->log2_min_pu_size))

The prompt cannot find x, y because it is unclear what the operator "# #" means, so the problem has not been resolved for the time being.

FFmpeg 3.2.4 + libx264 Windows compilation summary