使用cygwin在windows上编译ffmpeg的问题

时间：2013-08-12 15:12:10

标签： windows bash ffmpeg cygwin

最近我在Windows上编译ffmpeg时遇到了很多麻烦。我目前正在使用cgywin终端来运行代码。我试过在网上关注许多最受欢迎的教程，但我似乎无法让它工作。我目前正在使用本教程作为指南http://www.roman10.net/how-to-build-ffmpeg-for-android/

我在哪里：

我已经创建了一个bash脚本

#!/bin/bash

NDK=C:/Users/jrblain/Development/adt-bundle-windows-x86_64-20130514/android-ndk-r9
PLATFORM=$NDK/platforms/android-8/arch-arm/
PREBUILT=$NDK/toolchains/arm-linux-androideabi-4.6/prebuilt/windows-x86_64
function build_one
{
./configure --target-os=linux \
    --prefix=$PREFIX \
    --enable-cross-compile \
    --extra-libs="-lgcc" \
    --arch=arm \
    --cc=$PREBUILT/bin/arm-linux-androideabi-gcc \
    --cross-prefix=$PREBUILT/bin/arm-linux-androideabi- \
    --nm=$PREBUILT/bin/arm-linux-androideabi-nm \
    --sysroot=$PLATFORM \
    --extra-cflags=" -O3 -fpic -DANDROID -DHAVE_SYS_UIO_H=1 -Dipv6mr_interface=ipv6mr_ifindex -fasm -Wno-psabi -fno-short-enums -fno-strict-aliasing -finline-limit=300 $OPTIMIZE_CFLAGS " \
    --disable-shared \
    --enable-static \
    --extra-ldflags="-Wl,-rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib -nostdlib -lc -lm -ldl -llog" \
    --disable-everything \
    --enable-demuxer=mov \
    --enable-demuxer=h264 \
    --disable-ffplay \
    --enable-protocol=file \
    --enable-avformat \
    --enable-avcodec \
    --enable-decoder=rawvideo \
    --enable-decoder=mjpeg \
    --enable-decoder=h263 \
    --enable-decoder=mpeg4 \
    --enable-decoder=h264 \
    --enable-parser=h264 \
    --disable-network \
    --enable-zlib \
    --disable-avfilter \
    --disable-avdevice \
    $ADDITIONAL_CONFIGURE_FLAG

make clean
make  -j4 install
$PREBUILT/bin/arm-linux-androideabi-ar d libavcodec/libavcodec.a inverse.o
$PREBUILT/bin/arm-linux-androideabi-ld -rpath-link=$PLATFORM/usr/lib -L$PLATFORM/usr/lib  -soname libffmpeg.so -shared -nostdlib  -z,noexecstack -Bsymbolic --whole-archive --no-undefined -o $PREFIX/libffmpeg.so libavcodec/libavcodec.a libavformat/libavformat.a libavutil/libavutil.a libswscale/libswscale.a -lc -lm -lz -ldl -llog  --warn-once  --dynamic-linker=/system/bin/linker $PREBUILT/lib/gcc/arm-linux-androideabi/4.4.3/libgcc.a
}

#arm v6
#CPU=armv6
#OPTIMIZE_CFLAGS="-marm -march=$CPU"
#PREFIX=./android/$CPU 
#ADDITIONAL_CONFIGURE_FLAG=
#build_one

#arm v7vfpv3
CPU=armv7-a
OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfpv3-d16 -marm -march=$CPU "
PREFIX=./android/$CPU
ADDITIONAL_CONFIGURE_FLAG=
build_one

#arm v7vfp
#CPU=armv7-a
#OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU "
#PREFIX=./android/$CPU-vfp
#ADDITIONAL_CONFIGURE_FLAG=
#build_one

#arm v7n
#CPU=armv7-a
#OPTIMIZE_CFLAGS="-mfloat-abi=softfp -mfpu=neon -marm -march=$CPU -mtune=cortex-a8"
#PREFIX=./android/$CPU 
#ADDITIONAL_CONFIGURE_FLAG=--enable-neon
#build_one

#arm v6+vfp
#CPU=armv6
#OPTIMIZE_CFLAGS="-DCMP_HAVE_VFP -mfloat-abi=softfp -mfpu=vfp -marm -march=$CPU"
#PREFIX=./android/${CPU}_vfp 
#ADDITIONAL_CONFIGURE_FLAG=
#build_one

然后我按照这篇文章Does anyone find this useful? - Compiling FFMPEG on Windows with Cywin and NDK r5的步骤4-6进行了操作，其中包含

4 - Open the file 'configure' in the root of the FFMPEG directory in a text editor.

5 - Comment out lines 2073, 2074 and 2075.

6 - Below 2075, add the following line:

TMPDIR=c:/cygwin/tmp

当我在cgywin中运行脚本时，我得到了这个结果：

    install prefix            ./android/armv7-a
source path               .
C compiler                C:/Users/jrblain/Development/adt-bundle-windows-x86_64-20130514/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/windows-x86_64/bin/arm-linux-androideabi-gcc
ARCH                      arm (armv7-a)
big-endian                no
runtime cpu detection     yes
ARMv5TE enabled           yes
ARMv6 enabled             yes
ARMv6T2 enabled           yes
VFP enabled               yes
NEON enabled              yes
THUMB enabled             no
debug symbols             yes
strip symbols             yes
optimize for size         no
optimizations             yes
static                    yes
shared                    no
postprocessing support    no
new filter support        no
network support           no
threading support         pthreads
safe bitstream reader     yes
SDL support               no
opencl enabled            no
texi2html enabled         no
perl enabled              no
pod2man enabled           no
makeinfo enabled          no

External libraries:
zlib

Enabled decoders:
h263                    mjpeg                   rawvideo
h264                    mpeg4

Enabled encoders:

Enabled hwaccels:

Enabled parsers:
h263                    h264                    mpeg4video

Enabled demuxers:
h264                    mov

Enabled muxers:

Enabled protocols:
file

Enabled filters:

Enabled bsfs:

Enabled indevs:

Enabled outdevs:

License: LGPL version 2.1 or later
Creating config.mak, config.h, and doc/config.texi...
libavutil/avconfig.h is unchanged

WARNING: C:/Users/jrblain/Development/adt-bundle-windows-x86_64-20130514/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/windows-x86_64/bin/arm-linux-androideabi-pkg-config not found, library detection may fail.
library.mak:105: *** missing separator.  Stop.
library.mak:105: *** missing separator.  Stop.
C:\Users\jrblain\Development\adt-bundle-windows-x86_64-20130514\android-ndk-r9\toolchains\arm-linux-androideabi-4.6\prebuilt\windows-x86_64\bin\arm-linux-androideabi-ld.exe: ,noexecstack: unknown -z option
C:\Users\jrblain\Development\adt-bundle-windows-x86_64-20130514\android-ndk-r9\toolchains\arm-linux-androideabi-4.6\prebuilt\windows-x86_64\bin\arm-linux-androideabi-ld.exe: use the --help option for usage information

运行此脚本后，我在ffmpeg文件夹中获得了一些新文件。它们是.config，config（header），config.mak，config.fate。 android文件夹永远不会像它应该的那样创建。考虑到它随ffmpeg下载，我也不确定library.mak错误的来源。

我不确定这一切我在哪里出错了。我觉得我使用Windows会使这个构建过程与众不同。

1 个答案:

答案 0 :(得分：1)

第一个错误说“警告：未找到C：/.../ arm-linux-androideabi-pkg-config，库检测可能会失败。”所以我建议修复这条路。

'C：/'不是POSIX路径。 Cygwin程序能够翻译它（带警告）。

cd 'c:' # works. cd is a built-in command
ls 'c:' # doesn't work
ls 'c:/' # works (edited)

有关Cygwin如何映射POSIX- and Win32-style paths的文档。

根据我的经验，当您混合使用斜杠和反斜杠或从Cygwin调用Windows本机命令时，您会遇到问题。 Example：

javac -cp "$(cygpath -pw "$CLASSPATH")" hello.java

在我看来，您应该硬编码POSIX路径，或使用以下命令：

cygpath -u 'c:' # the relevant command provided by Cygwin
(cd 'c:' && pwd) # a tip, useful if you want a portable syntax

但也许我错了。我想你已经检查了路径

ls 'C:/Users/jrblain/Development/adt-bundle-windows-x86_64-20130514/android-ndk-r9/toolchains/arm-linux-androideabi-4.6/prebuilt/windows-x86_64/bin/arm-linux-androideabi-pkg-config'

我认为您已经检查了mk文件的第105行（制表符和linux 换行符）。

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