ffmpeg xcode 中的使用

時間  2019-11-18
標籤 ffmpeg xcode 使用 欄目 iOS 简体版
原文   原文鏈接

    最近比較閒,苦於ios設備上沒有直接播放torrent 文件的軟件,開始折騰了.找了很多資料有了思路.可是其中用到了ffmpeg 這個東西.ios

　　ffmpeg 是通用的一個視頻解決框架,用C語言編寫,通用性很強.git

  1. 編譯ffmpeg.
    1. 下載源碼後能夠本身手動編譯 ,反正是經過各類命令 配置configure 
    2. 經過一個很牛逼的腳本:git@github.com:kewlbear/FFmpeg-iOS-build-script.git     下載以後,檢查ffmpeg的版本號,替換成最新的 而後運行腳本就好了
      #!/bin/sh

# directories
SOURCE="ffmpeg-2.5"
FAT="FFmpeg-iOS"

SCRATCH="scratch"
# must be an absolute path
THIN=`pwd`/"thin"

# absolute path to x264 library
#X264=`pwd`/fat-x264

#FDK_AAC=`pwd`/fdk-aac/fdk-aac-ios

CONFIGURE_FLAGS="--enable-cross-compile --disable-debug --disable-programs \
                 --disable-doc --enable-pic"

if [ "$X264" ]
then
	CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-gpl --enable-libx264"
fi

if [ "$FDK_AAC" ]
then
	CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-libfdk-aac"
fi

# avresample
#CONFIGURE_FLAGS="$CONFIGURE_FLAGS --enable-avresample"

ARCHS="arm64 armv7s armv7 x86_64 i386"

COMPILE="y"
LIPO="y"

DEPLOYMENT_TARGET="6.0"

if [ "$*" ]
then
	if [ "$*" = "lipo" ]
	then
		# skip compile
		COMPILE=
	else
		ARCHS="$*"
		if [ $# -eq 1 ]
		then
			# skip lipo
			LIPO=
		fi
	fi
fi

if [ "$COMPILE" ]
then
	if [ ! `which yasm` ]
	then
		echo 'Yasm not found'
		if [ ! `which brew` ]
		then
			echo 'Homebrew not found. Trying to install...'
			ruby -e "$(curl -fsSL https://raw.github.com/Homebrew/homebrew/go/install)" \
				|| exit 1
		fi
		echo 'Trying to install Yasm...'
		brew install yasm || exit 1
	fi
	if [ ! `which gas-preprocessor.pl` ]
	then
		echo 'gas-preprocessor.pl not found. Trying to install...'
		(curl -L https://github.com/libav/gas-preprocessor/raw/master/gas-preprocessor.pl \
			-o /usr/local/bin/gas-preprocessor.pl \
			&& chmod +x /usr/local/bin/gas-preprocessor.pl) \
			|| exit 1
	fi

	if [ ! -r $SOURCE ]
	then
		echo 'FFmpeg source not found. Trying to download...'
		curl http://www.ffmpeg.org/releases/$SOURCE.tar.bz2 | tar xj \
			|| exit 1
	fi

	CWD=`pwd`
	for ARCH in $ARCHS
	do
		echo "building $ARCH..."
		mkdir -p "$SCRATCH/$ARCH"
		cd "$SCRATCH/$ARCH"

		CFLAGS="-arch $ARCH"
		if [ "$ARCH" = "i386" -o "$ARCH" = "x86_64" ]
		then
		    PLATFORM="iPhoneSimulator"
		    CFLAGS="$CFLAGS -mios-simulator-version-min=$DEPLOYMENT_TARGET"
		else
		    PLATFORM="iPhoneOS"
		    CFLAGS="$CFLAGS -mios-version-min=$DEPLOYMENT_TARGET"
		    if [ "$ARCH" = "arm64" ]
		    then
		        EXPORT="GASPP_FIX_XCODE5=1"
		    fi
		fi

		XCRUN_SDK=`echo $PLATFORM | tr '[:upper:]' '[:lower:]'`
		CC="xcrun -sdk $XCRUN_SDK clang"
		CXXFLAGS="$CFLAGS"
		LDFLAGS="$CFLAGS"
		if [ "$X264" ]
		then
			CFLAGS="$CFLAGS -I$X264/include"
			LDFLAGS="$LDFLAGS -L$X264/lib"
		fi
		if [ "$FDK_AAC" ]
		then
			CFLAGS="$CFLAGS -I$FDK_AAC/include"
			LDFLAGS="$LDFLAGS -L$FDK_AAC/lib"
		fi

		TMPDIR=${TMPDIR/%\/} $CWD/$SOURCE/configure \
		    --target-os=darwin \
		    --arch=$ARCH \
		    --cc="$CC" \
		    $CONFIGURE_FLAGS \
		    --extra-cflags="$CFLAGS" \
		    --extra-cxxflags="$CXXFLAGS" \
		    --extra-ldflags="$LDFLAGS" \
		    --prefix="$THIN/$ARCH" \
		|| exit 1

		make -j3 install $EXPORT || exit 1
		cd $CWD
	done
fi

if [ "$LIPO" ]
then
	echo "building fat binaries..."
	mkdir -p $FAT/lib
	set - $ARCHS
	CWD=`pwd`
	cd $THIN/$1/lib
	for LIB in *.a
	do
		cd $CWD
		echo lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB 1>&2
		lipo -create `find $THIN -name $LIB` -output $FAT/lib/$LIB || exit 1
	done

	cd $CWD
	cp -rf $THIN/$1/include $FAT
fi

echo Done
  2. 導入項目,有靜態包經驗的就就不用看了,這個對於我這個半路出家的和尚仍是處理了老半天才解決.
    .a文件直接導入 .h文件要導入文件夾結構   配置header search 環境變量  使用的時候導入文件 結構:#import "文件夾/文件.h"
  3. 編譯.
    1. 首次編譯.
      Undefined symbols for architecture armv7:
  "_deflateInit2_", referenced from:
      _encode_frame in libavcodec.a(pngenc.o)
  "_crc32", referenced from:
      _encode_frame in libavcodec.a(pngenc.o)
  "_deflateReset", referenced from:
      _encode_frame in libavcodec.a(lclenc.o)
      _encode_frame in libavcodec.a(zmbvenc.o)
  "_compress", referenced from:
      _encode_strip in libavcodec.a(tiffenc.o)
  "_deflateBound", referenced from:
      _flashsv_decode_frame in libavcodec.a(flashsv.o)
      _encode_frame in libavcodec.a(pngenc.o)
      _encode_frame in libavcodec.a(lclenc.o)
  "_inflateSync", referenced from:
      _flashsv_decode_frame in libavcodec.a(flashsv.o)
  "_inflateReset", referenced from:
      _flashsv_decode_frame in libavcodec.a(flashsv.o)
      _zlib_decomp in libavcodec.a(lcldec.o)
      _decode_frame in libavcodec.a(tscc.o)
      _zerocodec_decode_frame in libavcodec.a(zerocodec.o)
      _decode_frame in libavcodec.a(zmbv.o)
  "_iconv_open", referenced from:
      _avcodec_open2 in libavcodec.a(utils.o)
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  "_BZ2_bzDecompress", referenced from:
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
  "_inflate", referenced from:
      _http_read_stream in libavformat.a(http.o)
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
      _rtmp_open in libavformat.a(rtmpproto.o)
      _zlib_refill in libavformat.a(swfdec.o)
      _decode_frame_common in libavcodec.a(pngdec.o)
      _decode_text_chunk in libavcodec.a(pngdec.o)
      _flashsv_decode_frame in libavcodec.a(flashsv.o)
      ...
  "_inflateInit_", referenced from:
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
      _rtmp_open in libavformat.a(rtmpproto.o)
      _swf_read_header in libavformat.a(swfdec.o)
      _decode_frame_apng in libavcodec.a(pngdec.o)
      _decode_frame_png in libavcodec.a(pngdec.o)
      _decode_text_chunk in libavcodec.a(pngdec.o)
      _flashsv_decode_init in libavcodec.a(flashsv.o)
      ...
  "_iconv", referenced from:
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  "_BZ2_bzDecompressEnd", referenced from:
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
  "_inflateInit2_", referenced from:
      _http_read_header in libavformat.a(http.o)
  "_deflateEnd", referenced from:
      _flashsv_decode_frame in libavcodec.a(flashsv.o)
      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)
      _flashsv_encode_init in libavcodec.a(flashsvenc.o)
      _flashsv_encode_end in libavcodec.a(flashsvenc.o)
      _encode_frame in libavcodec.a(pngenc.o)
      _encode_end in libavcodec.a(lclenc.o)
      _encode_init in libavcodec.a(zmbvenc.o)
      ...
  "_BZ2_bzDecompressInit", referenced from:
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
  "_deflateInit_", referenced from:
      _flashsv_decode_frame in libavcodec.a(flashsv.o)
      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)
      _encode_init in libavcodec.a(lclenc.o)
      _encode_init in libavcodec.a(zmbvenc.o)
  "_zlibCompileFlags", referenced from:
      _http_read_header in libavformat.a(http.o)
  "_compress2", referenced from:
      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)
      _flashsv_encode_frame in libavcodec.a(flashsvenc.o)
  "_deflate", referenced from:
      _flashsv_decode_frame in libavcodec.a(flashsv.o)
      _flashsv2_encode_frame in libavcodec.a(flashsv2enc.o)
      _encode_frame in libavcodec.a(pngenc.o)
      _encode_frame in libavcodec.a(lclenc.o)
      _encode_frame in libavcodec.a(zmbvenc.o)
  "_inflateEnd", referenced from:
      _http_close in libavformat.a(http.o)
      _http_read_header in libavformat.a(http.o)
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
      _rtmp_open in libavformat.a(rtmpproto.o)
      _swf_read_close in libavformat.a(swfdec.o)
      _decode_frame_apng in libavcodec.a(pngdec.o)
      _decode_frame_png in libavcodec.a(pngdec.o)
      ...
  "_uncompress", referenced from:
      _id3v2_read_internal in libavformat.a(id3v2.o)
      _mov_read_cmov in libavformat.a(mov.o)
      _swf_read_packet in libavformat.a(swfdec.o)
      _decode_frame in libavcodec.a(cscd.o)
      _decode_frame in libavcodec.a(dxa.o)
      _decode_block in libavcodec.a(exr.o)
      _g2m_decode_frame in libavcodec.a(g2meet.o)
      ...
  "_iconv_close", referenced from:
      _avcodec_open2 in libavcodec.a(utils.o)
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

      導入 libz.1.2.5.dylib ,再次編譯
      github

      Undefined symbols for architecture armv7:
  "_BZ2_bzDecompressInit", referenced from:
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
  "_iconv", referenced from:
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  "_BZ2_bzDecompress", referenced from:
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
  "_BZ2_bzDecompressEnd", referenced from:
      _matroska_decode_buffer in libavformat.a(matroskadec.o)
  "_iconv_open", referenced from:
      _avcodec_open2 in libavcodec.a(utils.o)
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  "_iconv_close", referenced from:
      _avcodec_open2 in libavcodec.a(utils.o)
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

      導入 libbz2.1.0.dylib ,再次編譯

      ruby

      Undefined symbols for architecture armv7:
  "_iconv", referenced from:
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  "_iconv_open", referenced from:
      _avcodec_open2 in libavcodec.a(utils.o)
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
  "_iconv_close", referenced from:
      _avcodec_open2 in libavcodec.a(utils.o)
      _avcodec_decode_subtitle2 in libavcodec.a(utils.o)
ld: symbol(s) not found for architecture armv7
clang: error: linker command failed with exit code 1 (use -v to see invocation)

      導入  libiconv.2.4.0.dylib  編譯經過   3.0 後不經過
      框架

      Undefined symbols for architecture x86_64:
  "_CMBlockBufferCreateWithMemoryBlock", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
  "_CMSampleBufferCreate", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
  "_CMVideoFormatDescriptionCreate", referenced from:
      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)
  "_VTDecompressionSessionCreate", referenced from:
      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)
  "_VTDecompressionSessionDecodeFrame", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
  "_VTDecompressionSessionInvalidate", referenced from:
      _av_videotoolbox_default_free in libavcodec.a(videotoolbox.o)
  "_VTDecompressionSessionWaitForAsynchronousFrames", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
  "_kCMFormatDescriptionExtension_SampleDescriptionExtensionAtoms", referenced from:
      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)
ld: symbol(s) not found for architecture x86_64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

      導入 CoreMedia.framework  編譯curl

      Undefined symbols for architecture x86_64:
  "_VTDecompressionSessionCreate", referenced from:
      _av_videotoolbox_default_init2 in libavcodec.a(videotoolbox.o)
  "_VTDecompressionSessionDecodeFrame", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
  "_VTDecompressionSessionInvalidate", referenced from:
      _av_videotoolbox_default_free in libavcodec.a(videotoolbox.o)
  "_VTDecompressionSessionWaitForAsynchronousFrames", referenced from:
      _videotoolbox_common_end_frame in libavcodec.a(videotoolbox.o)
ld: symbol(s) not found for architecture x86_64

      導入 VideoToolbox.framework  編譯經過ide

　　到此準備結束ui

相關文章
相關標籤/搜索
每日一句
    每一个你不满意的现在，都有一个你没有努力的曾经。
本站公眾號
   歡迎關注本站公眾號,獲取更多信息
聯繫我們 最近搜索 最新文章 沪ICP备13005482号-10 MyBatis教程 SQL 教程 MySQL教程 Java 教程 Thymeleaf 教程 Hibernate教程 Spring教程 Redis教程