iphone - 为 armv6-7 构建 ffmpeg 失败
<p><p>我一直在尝试以我能想到的所有可能方式构建 ffmpeg。我正在尝试使用他们的 git 存储库中的最新版本和一个构建脚本，我已经确认它可以工作，它来自这个问题:<a href="https://stackoverflow.com/questions/5516170/iphone-sdk-4-3-libav-compiling-problem/6075920#comment-8351950" rel="noreferrer noopener nofollow">iPhone SDK 4.3 libav compiling problem</a> .该脚本昨天更新，显然适用于问题中的那个人。</p>
<p>我的问题是它不会为 armv6 anc armv7 生成 .a 文件(或实际上任何文件)。因此 <strong>lipo</strong> 命令连接到通用库中失败。我也尝试过使用 <a href="https://github.com/lajos/iFrameExtractor" rel="noreferrer noopener nofollow">iFrameExtractor</a> 中的构建脚本如果没有任何成功，它最终也会因 lipo-commands 而失败，我得到以下信息:</p>
<pre><code>lipo: can't open input file: ./compiled/armv6/lib/libavcodec.a (No such file or directory)
lipo: can't open input file: ./compiled/armv6/lib/libavdevice.a (No such file or directory)
lipo: can't open input file: ./compiled/armv6/lib/libavfilter.a (No such file or directory)
lipo: can't open input file: ./compiled/armv6/lib/libavformat.a (No such file or directory)
lipo: can't open input file: ./compiled/armv6/lib/libavutil.a (No such file or directory)
lipo: can't open input file: ./compiled/armv6/lib/libpostproc.a (No such file or directory)
lipo: can't open input file: ./compiled/armv6/lib/libswscale.a (No such file or directory)
</code></pre>
<p>我还发布了整个输出 <a href="https://rapidshare.com/files/3444142529/output.txt" rel="noreferrer noopener nofollow">here</a>如果有人知道在那里寻找什么(因为我不知道从哪里开始，它几乎有 5000 行输出。)
我还应该提到我正在为 <strong>armv6</strong>、<strong>armv7</strong> 和 <strong>i386</strong> 编译它。我想将它导入 XCode 以从视频源中获取 H.264 帧。</p>
<p>当我尝试为 armv6 构建时，我使用以下配置:</p>
<pre><code>./configure \
--enable-cross-compile \
--arch=arm \
--extra-cflags='-arch armv6' \
--extra-ldflags='-arch armv6' \
--target-os=darwin \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk \
--cpu=arm1176jzf-s \
--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneSimulator4.3.sdk/usr/lib/system \
--prefix=compiled/armv6
</code></pre>
<p>并得到以下输出:</p>
<pre><code>/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc is unable to create an executable file.
C compiler test failed.
If you think configure made a mistake, make sure you are using the latest
version from Git. If the latest version fails, report the problem to the
[email protected] mailing list or IRC #ffmpeg on irc.freenode.net.
Include the log file "config.log" produced by configure as this will help
solving the problem.
</code></pre>
<p>所以问题是，我应该使用什么 c 编译器？我尝试过不同的:
arm-apple-darwin10-gcc-4.2.1
arm-apple-darwin10-llvm-gcc-4.2
海合会</p>
<p>但结果相同。 gcc 适用于 i386 和 armv7，所以我想它也适用于 armv6</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>我使用以下内容仅针对 armv6 和 armv7 进行编译。我无法让它为 i386 工作，我收到 cputype 和 subcputype 错误的错误。显然 cputype 应该是 x86 而 subcputype 应该是 intel。 </p>
<p>无论如何，我使用以下构建脚本来编译 arm 架构(我最终使用 gcc 并且它起作用了，我猜是配置标志从一开始就错了):</p>
<p>构建脚本:</p>
<pre><code>#!/bin/sh
set -e
SCRIPT_DIR=$( (cd -P $(dirname $0) && pwd) )
DIST_DIR_BASE=${DIST_DIR_BASE:="$SCRIPT_DIR/dist"}
if [ -d ffmpeg ]
then
echo "Found ffmpeg source directory, no need to fetch from git..."
else
echo "Fetching ffmpeg from git://git.videolan.org/ffmpeg.git..."
git clone git://git.videolan.org/ffmpeg.git
fi
ARCHS=${ARCHS:-"armv6 armv7"}
for ARCH in $ARCHS
do
FFMPEG_DIR=ffmpeg-$ARCH
if [ -d $FFMPEG_DIR ]
then
echo "Removing old directory $FFMPEG_DIR"
rm -rf $FFMPEG_DIR
fi
echo "Copying source for $ARCH to directory $FFMPEG_DIR"
cp -a ffmpeg $FFMPEG_DIR
cd $FFMPEG_DIR
DIST_DIR=$DIST_DIR_BASE-$ARCH
mkdir -p $DIST_DIR
case $ARCH in
armv6)
EXTRA_FLAGS="--enable-cross-compile --target-os=darwin --arch=arm --cpu=arm1176jzf-s"
EXTRA_CFLAGS="-arch $ARCH"
EXTRA_LDFLAGS="-arch $ARCH"
;;
armv7)
EXTRA_FLAGS="--enable-cross-compile --target-os=darwin --arch=arm --cpu=cortex-a8 --enable-pic"
EXTRA_CFLAGS="-arch $ARCH"
EXTRA_LDFLAGS="-arch $ARCH"
;;
x86_64)
EXTRA_CC_FLAGS="-mdynamic-no-pic"
;;
esac
echo "Configuring ffmpeg for $ARCH..."
./configure \
--prefix=$DIST_DIR \
--extra-ldflags=-L/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk/usr/lib/system \
--disable-bzlib \
--disable-doc \
--disable-ffmpeg \
--disable-ffplay \
--disable-ffserver \
--cc=/Developer/Platforms/iPhoneOS.platform/Developer/usr/bin/gcc \
--sysroot=/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS4.3.sdk \
--extra-ldflags="$EXTRA_LDFLAGS" \
--extra-cflags="$EXTRA_CFLAGS" \
$EXTRA_FLAGS
echo "Installing ffmpeg for $ARCH..."
make && make install
cd $SCRIPT_DIR
if [ -d $DIST_DIR/bin ]
then
rm -rf $DIST_DIR/bin
fi
if [ -d $DIST_DIR/share ]
then
rm -rf $DIST_DIR/share
fi
done
</code></pre>
<p>并结合 libs 脚本:</p>
<pre><code>#!/bin/bash
set -e
ARCHS="armv6 armv7"
for ARCH in $ARCHS
do
if [ -d dist-$ARCH ]
then
MAIN_ARCH=$ARCH
fi
done
if [ -z "$MAIN_ARCH" ]
then
echo "Please compile an architecture"
exit 1
fi
OUTPUT_DIR="dist-uarch"
rm -rf $OUTPUT_DIR
mkdir -p $OUTPUT_DIR/lib $OUTPUT_DIR/include
for LIB in dist-$MAIN_ARCH/lib/*.a
do
LIB=`basename $LIB`
LIPO_CREATE=""
for ARCH in $ARCHS
do
if [ -d dist-$ARCH ]
then
LIPO_CREATE="$LIPO_CREATE-arch $ARCH dist-$ARCH/lib/$LIB "
fi
done
OUTPUT="$OUTPUT_DIR/lib/$LIB"
echo "Creating: $OUTPUT"
lipo -create $LIPO_CREATE -output $OUTPUT
lipo -info $OUTPUT
done
echo "Copying headers from dist-$MAIN_ARCH..."
cp -R dist-$MAIN_ARCH/include/* $OUTPUT_DIR/include
</code></pre>
<p>然后我从 BUILD-FOLDER/dist-uarch 导入 .a 文件，它像魅力一样在 xcode 中构建!</p></p>
<p style="font-size: 20px;">关于iphone - 为 armv6-7 构建 ffmpeg 失败，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/7007305/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/7007305/
</a>
</p>
页:
[1]