使用 Android-NDK-16.1 构建 FFMPEG-3.4 时出错

Question

尝试使用 Android-NDK-16.1 编译 FFMPEG-3.4。

在 Mac 上编译源代码。

低于警告/错误：

1. 警告：/Users/strehan/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-pkg-config未找到，库检测可能失败。

2. 错误：在 libavdevice/avdevice.c:19:0:./libavutil/avassert.h:30:20 包含的文件中：致命错误：stdlib.h：没有这样的文件或目录

3. 错误：/Users/strehan/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9 .x/include/stdint.h:9:26：致命错误：stdint.h：没有这样的文件或目录

4. 错误：/libavutil/common.h:33:19：致命错误：errno.h：没有这样的文件或目录

下面是用于构建的build_script.sh：

#!/bin/bash
NDK=/Users/strehan/Library/Android/sdk/ndk-bundle
SYSROOT=$NDK/platforms/android-21/arch-arm/
TOOLCHAIN=$NDK/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64
function build_one
{
./configure \
--prefix=$PREFIX \
--enable-shared \
--disable-static \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffprobe \
--disable-doc \
--disable-symver \
--enable-protocol=concat \
--enable-protocol=file \
--enable-muxer=mp4 \
--enable-demuxer=mpegts \
--cross-prefix=$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" \
$ADDITIONAL_CONFIGURE_FLAG
make clean
make -j3
make install
}
CPU=arm
PREFIX=$(pwd)/android/$CPU
ADDI_CFLAGS="-marm"
build_one

终端输出：

Enabled indevs:
lavfi

Enabled outdevs:

License: LGPL version 2.1 or later

WARNING: /Users/strehan/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/bin/arm-linux-androideabi-pkg-config not found, library detection may fail.
config.h is unchanged
libavutil/avconfig.h is unchanged
libavcodec/bsf_list.c is unchanged
libavformat/protocol_list.c is unchanged
ffbuild/config.sh is unchanged
GEN libavutil/libavutil.version
GEN libswscale/libswscale.version
GEN libswresample/libswresample.version
GEN libavcodec/libavcodec.version
GEN libavformat/libavformat.version
GEN libavfilter/libavfilter.version
GEN libavdevice/libavdevice.version
CC  libavdevice/alldevices.o
CC  libavdevice/avdevice.o
CC  libavdevice/lavfi.o
In file included from libavdevice/avdevice.c:19:0:
./libavutil/avassert.h:30:20: fatal error: stdlib.h: No such file or directory
 #include <stdlib.h>
                    ^
compilation terminated.
make: *** [libavdevice/avdevice.o] Error 1
make: *** Waiting for unfinished jobs....
In file included from ./libavutil/avutil.h:296:0,
                 from ./libavutil/log.h:25,
                 from libavdevice/avdevice.h:48,
                 from libavdevice/alldevices.c:23:
./libavutil/common.h:33:19: fatal error: errno.h: No such file or directory
 #include <errno.h>
                   ^
compilation terminated.
In file included from ./libavutil/avstring.h:25:0,
                 from ./libavutil/bprint.h:27,
                 from libavdevice/lavfi.c:30:
/Users/strehan/Library/Android/sdk/ndk-bundle/toolchains/arm-linux-androideabi-4.9/prebuilt/darwin-x86_64/lib/gcc/arm-linux-androideabi/4.9.x/include/stdint.h:9:26: fatal error: stdint.h: No such file or directory
 # include_next <stdint.h>
                          ^
make: *** [libavdevice/alldevices.o] Error 1
compilation terminated.
make: *** [libavdevice/lavfi.o] Error 1
INSTALL doc/examples/avio_dir_cmd.c
INSTALL doc/examples/avio_reading.c
INSTALL doc/examples/decode_audio.c
INSTALL doc/examples/decode_video.c
INSTALL doc/examples/demuxing_decoding.c
INSTALL doc/examples/encode_audio.c
INSTALL doc/examples/encode_video.c
INSTALL doc/examples/extract_mvs.c
INSTALL doc/examples/filter_audio.c
INSTALL doc/examples/filtering_audio.c
INSTALL doc/examples/filtering_video.c
INSTALL doc/examples/http_multiclient.c
INSTALL doc/examples/hw_decode.c
INSTALL doc/examples/metadata.c
INSTALL doc/examples/muxing.c
INSTALL doc/examples/qsvdec.c
INSTALL doc/examples/remuxing.c
INSTALL doc/examples/resampling_audio.c
INSTALL doc/examples/scaling_video.c
INSTALL doc/examples/transcode_aac.c
INSTALL doc/examples/transcoding.c
INSTALL doc/examples/vaapi_encode.c
INSTALL doc/examples/README
INSTALL doc/examples/Makefile
INSTALL doc/examples/avio_dir_cmd.c
INSTALL doc/examples/avio_reading.c
INSTALL doc/examples/decode_audio.c
INSTALL doc/examples/decode_video.c
INSTALL doc/examples/demuxing_decoding.c
INSTALL doc/examples/encode_audio.c
INSTALL doc/examples/encode_video.c
INSTALL doc/examples/extract_mvs.c
INSTALL doc/examples/filter_audio.c
INSTALL doc/examples/filtering_audio.c
INSTALL doc/examples/filtering_video.c
INSTALL doc/examples/http_multiclient.c
INSTALL doc/examples/hw_decode.c
INSTALL doc/examples/metadata.c
INSTALL doc/examples/muxing.c
INSTALL doc/examples/qsvdec.c
INSTALL doc/examples/remuxing.c
INSTALL doc/examples/resampling_audio.c
INSTALL doc/examples/scaling_video.c
INSTALL doc/examples/transcode_aac.c
INSTALL doc/examples/transcoding.c
INSTALL doc/examples/vaapi_encode.c
INSTALL doc/examples/README
INSTALL doc/examples/Makefile
CC  libavdevice/alldevices.o
In file included from ./libavutil/avutil.h:296:0,
                 from ./libavutil/log.h:25,
                 from libavdevice/avdevice.h:48,
                 from libavdevice/alldevices.c:23:
./libavutil/common.h:33:19: fatal error: errno.h: No such file or directory
 #include <errno.h>
                   ^
compilation terminated.
make: *** [libavdevice/alldevices.o] Error 1

请帮助解决这些错误。由于这些错误/警告，编译正在终止。

注意： 即使出现这些错误，Android 目录也会被创建。但我认为由于上述错误，库没有正确编译。

如果还有其他需要，请告诉我。请帮忙。

Answer 1

您的构建脚本已过时，并且与现代 NDK 不兼容（它不遵循 https://android.googlesource.com/platform/ndk/+/master/docs/UnifiedHeaders.md#supporting-unified-headers-in-your-build-system）。

我建议您为自己省点麻烦，并使用standalone toolchain 为您处理组织方面的问题。