openssl脚本：

#!/bin/bash

API=21
export ANDROID_NDK_HOME=/home/xxx/ndk

CC=clang
CPU=arm64
PLATFORM=aarch64-linux-android
CPU_ARCH="arm64-v8a"
echo "\n======================================================================"
echo "[*] start compile openssl for android $CPU_ARCH ..."
echo "======================================================================\n"
echo "\n======================================================================"
echo "[*] make clean ..."
echo "======================================================================\n"
make clean
rm -rf $(pwd)/android/$CPU_ARCH	

export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
echo "\n======================================================================"
echo "[*] configure ..."
echo "======================================================================\n"
   ./Configure \
        android-$CPU \
        -D__ANDROID_API__=$API \
        --prefix=$(pwd)/android/$CPU_ARCH \
        --openssldir=$(pwd)/android/$CPU_ARCH \
        no-shared no-ssl2 no-ssl3 no-comp no-hw no-engine
make
make install

x264脚本:

#!/bin/bash
export ANDROID_NDK_HOME=/home/xxx/ndk
export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
NDK=/home/xxx/ndk
HOST_TAG=linux-x86_64
TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/$HOST_TAG
CPU=armv8-a
HOST=aarch64-linux-android
ANDROID_LIB_PATH="$(pwd)/android"
API=21
export CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang
export CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++

echo "build for android $CPU"
./configure \
 --host=$HOST \
 --disable-shared \
 --enable-static \
 --prefix="$ANDROID_LIB_PATH/$CPU" \
 --enable-pic \
 --enable-strip \
 --extra-cflags="-fPIC"

make clean
make -j8
make install

#export AR=$TOOLCHAIN/bin/aarch64-linux-android-ar
#export AS=$TOOLCHAIN/bin/aarch64-linux-android-a
#export LD=$TOOLCHAIN/bin/aarch64-linux-android-ld
#export RANLIB=$TOOLCHAIN/bin/aarch64-linux-android-ranlib
#export STRIP=$TOOLCHAIN/bin/aarch64-linux-android-strip

ffmpeg脚本:

#!/bin/bash
export PATH=$ANDROID_NDK_HOME/toolchains/llvm/prebuilt/linux-x86_64/bin:$PATH
NDK=/home/xxx/ndk
TOOLCHAIN=$NDK/toolchains/llvm/prebuilt/linux-x86_64/
API=21


#armv8-a
ARCH=arm64
CPU=armv8-a
CC=$TOOLCHAIN/bin/aarch64-linux-android$API-clang
CXX=$TOOLCHAIN/bin/aarch64-linux-android$API-clang++
SYSROOT=$NDK/toolchains/llvm/prebuilt/linux-x86_64/sysroot
CROSS_PREFIX=$TOOLCHAIN/bin/aarch64-linux-android-
PREFIX=$(pwd)/android/$CPU
OPTIMIZE_CFLAGS="-march=$CPU"
#第三方库

OPENSSL_INCLUDE=/home/xxx/openssl/android/arm64-v8a/include
OPENSSL_LIB=/home/xxx/openssl/android/arm64-v8a/lib

X264_INCLUDE=/home/xxx/x264/android/armv8-a/include
X264_LIB=/home/xxx/x264/android/armv8-a/lib


echo "Compiling FFmpeg for $CPU"
./configure \
    --prefix=$PREFIX \
    --disable-neon \
    --disable-hwaccels \
    --disable-gpl \
    --disable-postproc \
    --enable-shared \
    --enable-jni \
    --disable-mediacodec \
    --disable-decoder=h264_mediacodec \
    --disable-decoder=hevc \
    --disable-decoder=hevc_v4l2m2m \
    --disable-encoder=hevc_v4l2m2m \
    --disable-static \
    --disable-doc \
    --disable-symver \
    --disable-ffmpeg \
    --disable-ffplay \
    --disable-ffprobe \
    --disable-doc \
    --disable-symver \
    --extra-cflags="-I$X264_INCLUDE  -I$OPENSSL_INCLUDE " \
    --extra-ldflags="-L$OPENSSL_LIB -L$X264_LIB" \
    --enable-nonfree \
    --enable-gpl \
    --enable-libx264 \
    --enable-openssl \
    --enable-protocols \
    --enable-protocol=https \
    --enable-protocol=http \
    --enable-network \
    --enable-demuxer=rtsp \
    --enable-avresample \
    --cross-prefix=$CROSS_PREFIX \
    --target-os=android \
    --arch=$ARCH \
    --cpu=$CPU \
    --cc=$CC \
    --cxx=$CXX \
    --sysroot=$SYSROOT \
    --extra-cflags="-Os -fpic $OPTIMIZE_CFLAGS" \
    --extra-ldflags="$ADDI_LDFLAGS" \
    $ADDITIONAL_CONFIGURE_FLAG
make clean
make
make install
echo "The Compilation of FFmpeg for $CPU is completed"

编译好的ffmpeg文件（arm-v8a）放在：
https://gitee.com/ys1879615351/ndk22-ffmpeg