iOS 开发音视频流[1]---FFmpeg
原文地址: http://www.jianshu.com/p/4811f11aed27
本文是自己实际开发过程中遇到的问题。
1、准备
1.1、Xcode
`XCode`提供了Mac平台开发环境必须的gcc编译器，要注意的是`XCode` 安装后并没有命令行的gcc可用，
还需要打开`XCode`，在某个设置里添加Command Line Tools，`XCode`就会自动下载并安装好gcc，
同时还有git也被安装了。
1.2、Homebrew
`homebre` 是 Mac 平台上的一个包管理工具，提供了许多 Mac 下没有的 Linux工具等，
而且安装工具极其简单，一句命令行 gameOver。
2、安装FFmpeg
ffmpeg的官方网站是：http://ffmpeg.org/
2.1、在终端输入以下命令行：
zhuyuhui-4:~ zhuyuhui$ brew install ffmpeg Updating Homebrew... ==> Auto-updated Homebrew! Updated 1 tap (homebrew/core). ==> New Formulae bchunk elasticsearch@5.6 kibana@5.6 logstash@5.6 ==> Updated Formulae apibuilder-cli grafana mercurial sassc arangodb grakn metricbeat scons azure-cli grpc mighttpd2 shpotify bitrise harfbuzz mosh sonarqube citus heartbeat nickle streamlink commandbox influxdb open-scene-graph supersonic couchdb itstool opencoarrays swift-protobuf cppad jfrog-cli-go opusfile terragrunt crystal-icr kibana paket traefik dbus kotlin pgrouting upscaledb elasticsearch libfaketime planck urh faac libopusenc poco vault faas-cli libphonenumber pqiv xtensor filebeat libtrace protobuf youtube-dl fn lighttpd protobuf-c zbackup folly logstash protobuf-swift zenity git-cinnabar lxc pumba zimg gjstest mariadb@10.1 purescript Error: Your Xcode (8.3.3) is too outdated. Please update to Xcode 9.1 (or delete it). Xcode can be updated from the App Store. zhuyuhui-4:~ zhuyuhui$
我的电脑上同时安装了Xcode8.3.3和Xcode9.0.1[两个Xcode都安装在Applications]。出现上述错误,找到解决方法如下：
https://stackoverflow.com/questions/40296756/homebrew-saying-xcode-is-outdated
So as @NicolasMiari mentioned in a comment above, the fix to my issue ended up having to
have both Xcode 7 and Xcode 8 on my machine. I went on the apple developer site, downloaded Xcode 8,
saved it to my documents and then used: sudo xcode-select -switch ~/Documents/Xcode.app/ and then ran my brew install which worked as expected. Afterwards I ran: sudo xcode-select -switch /Applications/Xcode.app/ to switch back to Xcode 7.3.1. Hope this helps someone else! and thanks for the suggestions!
按照上述方法,先执行
sudo xcode-select -switch /Applications/Xcode9.app/
然后执行下面代码：
Last login: Thu Nov 16 09:11:31 on console zhuyuhui-4:~ zhuyuhui$ brew install ffmpeg Updating Homebrew... ==> Auto-updated Homebrew! Updated 1 tap (homebrew/core). ==> New Formulae bchunk elasticsearch@5.6 kibana@5.6 logstash@5.6 ==> Updated Formulae apibuilder-cli grafana mercurial sassc arangodb grakn metricbeat scons azure-cli grpc mighttpd2 shpotify bitrise harfbuzz mosh sonarqube citus heartbeat nickle streamlink commandbox influxdb open-scene-graph supersonic couchdb itstool opencoarrays swift-protobuf cppad jfrog-cli-go opusfile terragrunt crystal-icr kibana paket traefik dbus kotlin pgrouting upscaledb elasticsearch libfaketime planck urh faac libopusenc poco vault faas-cli libphonenumber pqiv xtensor filebeat libtrace protobuf youtube-dl fn lighttpd protobuf-c zbackup folly logstash protobuf-swift zenity git-cinnabar lxc pumba zimg gjstest mariadb@10.1 purescript Error: Your Xcode (8.3.3) is too outdated. Please update to Xcode 9.1 (or delete it). Xcode can be updated from the App Store. zhuyuhui-4:~ zhuyuhui$ brew install ffmpeg Updating Homebrew... ==> Installing dependencies for ffmpeg: lame, x264, xvid ==> Installing ffmpeg dependency: lame ==> Downloading https://homebrew.bintray.com/bottles/lame-3.99.5.high_sierra.bot ######################################################################## 100.0% ==> Pouring lame-3.99.5.high_sierra.bottle.1.tar.gz 🍺 /usr/local/Cellar/lame/3.99.5: 27 files, 2MB ==> Installing ffmpeg dependency: x264 ==> Downloading https://homebrew.bintray.com/bottles/x264-r2795.high_sierra.bott ######################################################################## 100.0% ==> Pouring x264-r2795.high_sierra.bottle.tar.gz 🍺 /usr/local/Cellar/x264/r2795: 11 files, 3.2MB ==> Installing ffmpeg dependency: xvid ==> Downloading https://homebrew.bintray.com/bottles/xvid-1.3.4.high_sierra.bott ######################################################################## 100.0% ==> Pouring xvid-1.3.4.high_sierra.bottle.tar.gz 🍺 /usr/local/Cellar/xvid/1.3.4: 10 files, 1.2MB ==> Installing ffmpeg ==> Downloading https://homebrew.bintray.com/bottles/ffmpeg-3.4.high_sierra.bott ######################################################################## 100.0% ==> Pouring ffmpeg-3.4.high_sierra.bottle.tar.gz 🍺 /usr/local/Cellar/ffmpeg/3.4: 248 files, 50.9MB zhuyuhui-4:~ zhuyuhui$
紧接着我们执行
brew info ffmpeg
zhuyuhui-4:~ zhuyuhui$ brew ls ffmpeg node python ssh-copy-id yasm flow nvm python3 watchman gdbm openssl readline x264 lame pcre ruby xvid libyaml pkg-config sqlite xz zhuyuhui-4:~ zhuyuhui$ brew info ffmpeg ffmpeg: stable 3.4 (bottled), HEAD Play, record, convert, and stream audio and video https://ffmpeg.org/ /usr/local/Cellar/ffmpeg/3.4 (248 files, 50.9MB) * Poured from bottle on 2017-11-16 at 10:47:38 From: https://github.com/Homebrew/homebrew-core/blob/master/Formula/ffmpeg.rb ==> Dependencies Build: nasm ✘, pkg-config ✔, texi2html ✘ Recommended: lame ✔, x264 ✔, xvid ✔ Optional: chromaprint ✘, fdk-aac ✘, fontconfig ✘, freetype ✘, frei0r ✘, game-music-emu ✘, libass ✘, libbluray ✘, libbs2b ✘, libcaca ✘, libgsm ✘, libmodplug ✘, libsoxr ✘, libssh ✘, libvidstab ✘, libvorbis ✘, libvpx ✘, opencore-amr ✘, openh264 ✘, openjpeg ✘, openssl ✘, opus ✘, rtmpdump ✘, rubberband ✘, sdl2 ✘, snappy ✘, speex ✘, tesseract ✘, theora ✘, two-lame ✘, wavpack ✘, webp ✘, x265 ✘, xz ✔, zeromq ✘, zimg ✘ ==> Options --with-chromaprint Enable the Chromaprint audio fingerprinting library --with-fdk-aac Enable the Fraunhofer FDK AAC library --with-fontconfig Build with fontconfig support --with-freetype Build with freetype support --with-frei0r Build with frei0r support --with-game-music-emu Build with game-music-emu support --with-libass Enable ASS/SSA subtitle format --with-libbluray Build with libbluray support --with-libbs2b Build with libbs2b support --with-libcaca Build with libcaca support --with-libgsm Build with libgsm support --with-libmodplug Build with libmodplug support --with-libsoxr Enable the soxr resample library --with-libssh Enable SFTP protocol via libssh --with-libvidstab Enable vid.stab support for video stabilization --with-libvorbis Build with libvorbis support --with-libvpx Build with libvpx support --with-opencore-amr Enable Opencore AMR NR/WB audio format --with-openh264 Enable OpenH264 library --with-openjpeg Enable JPEG 2000 image format --with-openssl Enable SSL support --with-opus Build with opus support --with-rtmpdump Enable RTMP protocol --with-rubberband Enable rubberband library --with-sdl2 Enable FFplay media player --with-snappy Enable Snappy library --with-speex Build with speex support --with-tesseract Enable the tesseract OCR engine --with-theora Build with theora support --with-tools Enable additional FFmpeg tools --with-two-lame Build with two-lame support --with-wavpack Build with wavpack support --with-webp Enable using libwebp to encode WEBP images --with-x265 Enable x265 encoder --with-xz Enable decoding of LZMA-compressed TIFF files --with-zeromq Enable using libzeromq to receive commands sent through a libzeromq client --with-zimg Enable z.lib zimg library --without-gpl Disable building GPL licensed parts of FFmpeg --without-lame Disable MP3 encoder --without-qtkit Disable deprecated QuickTime framework --without-securetransport Disable use of SecureTransport --without-x264 Disable H.264 encoder --without-xvid Disable Xvid MPEG-4 video encoder --HEAD Install HEAD version zhuyuhui-4:~ zhuyuhui$
Game Over 安装完毕。
注意：我们之前执行 sudo xcode-select -switch /Applications/Xcode9.app/ 之后才安装FFmpeg成功，如果你之后还需要使用Xcode8.3.3，那么最好再执行 sudo xcode-select -switch /Applications/Xcode.app/
下面是我应用程序里Xcode截图：
