ffmpegコマンドでmp4からm4a音声データだけを抜き出す
中学時代の同級生から電話があり、何かと思ったら
「区民大会で使うBGMが欲しいのだけどどうにかならない？ CDとか作り方分からないし...」
それは困った...けど俺もやりたくないし、やり方が分からない。
地元の区民大会にも「必ず出るように!」と町内の先輩から念を押されているので、「そんなこと、嫌です」なんて言えないし。
「了解しました、やりましょう」ということ引き受けてしまい、さらに悪いことに、
Windows8でやろうと思ったのですが、操作方法が難しいのでGentooでやってみました
まず、youtubeで適当にmp4を拾ってくる
これはブラウザで拾ってきてね
次にffmpegパッケージをインストールする
USEフラグはaacを入れてください、自分はこんな感じです
karky7 ~ # equery u media-video/ffmpeg
[ Legend : U - final flag setting for installation]
[ : I - package is installed with flag ]
[ Colors : set, unset ]
* Found these USE flags for media-video/ffmpeg-0.10.7:
U I
- - 3dnow : Adds support for 3dnow multimedia processor instructions
- - 3dnowext : Enable manually-optimised routines using the AMD 3DNow!Ex SIMD instruction set, present in modern AMD CPUs. (Check for 3dnowext in
/proc/cpuinfo to know whether your CPU supports it).
+ + X : Adds support for X11
+ + aac : Enables support for MPEG-4 AAC Audio
- - aacplus : AAC+ encoding via media-libs/libaacplus.
+ + alsa : Adds support for media-libs/alsa-lib (Advanced Linux Sound Architecture)
- - amr : Enables Adaptive Multi-Rate Audio support
- - avx : Adds support for Advanced Vector Extensions instructions (Intel Sandy Bridge, AMD Bulldozer and later chips)
- - bindist : Enforces license compatibility constraints via REQUIRED_USE.
+ + bzip2 : Use the bzlib compression library
- - cdio : Enables audio CD grabbing with dev-libs/libcdio.
- - cpudetection : Enables runtime CPU detection (useful for bindist, compatibility on other CPUs)
- - debug : Enable extra debug codepaths, like asserts and extra output. If you want to get meaningful backtraces see
http://www.gentoo.org/proj/en/qa/backtraces.xml
- - dirac : Enable Dirac video support (an advanced royalty-free video compression format) via the reference library: dirac.
+ + doc : Adds extra documentation (API, Javadoc, etc). It is recommended to enable per package instead of globally
+ + encode : Adds support for encoding of audio or video files
- - faac : Use external faac library for AAC encoding
+ - fftools_aviocat : cat's an URL to another one, useful for dumping streams.
+ - fftools_cws2fws : converts cws files (Macromedia Flash, compressed) to fws ones (Macromedia Flash, uncompressed).
+ - fftools_ffeval : A simple expression evalutor.
+ - fftools_graph2dot : A tool to convert a libavfilter graph to a dot file.
+ - fftools_ismindex : A tool for creating smooth streaming manifests.
+ - fftools_pktdumper : Dumps packets as demuxed by libavformat.
+ - fftools_qt-faststart : Rearranges a Quicktime file to facilitate network streaming.
+ - fftools_trasher : Writes burts of random data into a file. Great for testing error robustness/resilience/concealment.
- - frei0r : Enable frei0r wrapping in libavfilter
- - gnutls : Adds support for net-libs/gnutls (TLS 1.0 and SSL 3.0 support)
- - gsm : Adds support for the gsm lossy speech compression codec
+ - hardcoded-tables : Use pre-calculated tables rather than calculating them on the fly.
- - ieee1394 : Enable FireWire/iLink IEEE1394 support (dv, camera, ...)
- - jack : Adds support for the JACK Audio Connection Kit
- - jpeg2k : Support for JPEG 2000, a wavelet-based image compression format
- - libass : SRT/SSA/ASS (SubRip / SubStation Alpha) subtitle support
- - libv4l : Uses media-libs/libv4l for video4linux instead of direct calls. Adds support for more devices via the userspace library.
+ + mmx : Adds support for optimizations for Pentium MMX and Athlon class processors
- - mmxext : Enables mmx2 support
- - modplug : Adds libmodplug support for playing SoundTracker-style music files
+ + mp3 : Add support for reading mp3 files
- - network : Enables network streaming support
- - openal : Adds support for the Open Audio Library
- - openssl : Enables dev-libs/openssl support. Adds support for encrypted network protocols (TLS/HTTPS).
- - oss : Adds support for OSS (Open Sound System)
- - pic : Force shared libraries to be built as PIC (this is slower)
+ + pulseaudio : Adds support for PulseAudio sound server
- - rtmp : Enable Real Time Messaging Protocol using librtmp
- - schroedinger : Enable Dirac video support (an advanced royalty-free video compression format) via libschroedinger (high-speed implementation in C of the
Dirac codec).
+ + sdl : Adds support for Simple Direct Layer (media library)
- - speex : Adds support for the speex audio codec (used for speech)
- - ssse3 : Faster floating point optimization for SSSE3 capable chips (Intel Core 2 and later chips)
- - static-libs : Build static libraries
- - test : Workaround to pull in packages needed to run with FEATURES=test. Portage-2.1.2 handles this internally, so don't set it in
make.conf/package.use anymore
- - theora : Adds support for the Theora Video Compression Codec
- - threads : Adds threads support for various packages. Usually pthreads
+ + truetype : Adds support for FreeType and/or FreeType2 fonts
- - v4l : Enable support for video4linux (using linux-headers or userspace libv4l libraries)
- - vaapi : Enables VAAPI (Video Acceleration API) for hardware decoding
- - vdpau : Enable the Video Decode and Presentation API for Unix acceleration interface
+ + vorbis : Adds support for the OggVorbis audio codec
- - vpx : Enables vp8 codec support using libvpx: Decoding vp8 does not require this to be enabled but libvpx can also be used for decoding; encoding
vp8 requires this useflag to be enabled though.
+ + x264 : Enable h264 encoding using x264
+ + xvid : Adds support for xvid.org's open-source mpeg-4 codec
+ + zlib : Adds support for zlib (de)compression
karky7 ~ #
次にffmpegパッケージをインストールする
USEフラグを決めたらffmpegパッケージのインストール
karky7 ~ # emerge -pv media-video/ffmpeg
These are the packages that would be merged, in order:
Calculating dependencies... done!
[ebuild U ] media-video/ffmpeg-0.10.7 [0.10.3] USE="X aac alsa bzip2 doc encode hardcoded-tables mmx mp3 pulseaudio sdl truetype vorbis x264 xvid zlib -3dnow -3dnowext -aacplus (-altivec) -amr -avx -bindist -cdio (-celt) -cpudetection -debug -dirac -faac -frei0r -gnutls -gsm -ieee1394 -jack -jpeg2k -libass -libv4l -mmxext -modplug (-neon) -network -openal -openssl -oss -pic -rtmp -schroedinger -speex -ssse3 -static-libs {-test} -theora -threads -v4l -vaapi -vdpau (-vis) -vpx" FFTOOLS="aviocat cws2fws ffeval graph2dot ismindex pktdumper qt-faststart trasher" 5,647 kB
Total: 1 package (1 upgrade), Size of downloads: 5,647 kB
* IMPORTANT: 1 news items need reading for repository 'hacking-gentoo'.
* IMPORTANT: 13 news items need reading for repository 'gentoo'.
* Use eselect news to read news items.
karky7 ~ # emerge media-video/ffmpeg
ffmpegをコマンドから使ってみる
こんな感じで変換できる、とりあえずffmpeg --helpしても膨大なヘルプが出てくるので後で確認してくださいオプションの説明
- -i
- inputファイル
- -nv
- 音声のみ抽出(disable video)
- -acodec copy
- force audio codec ('copy' to copy stream)
と言うような感じで、抜き出す
cuomo@karky7 ~/m4a $ ffmpeg -i ニンジャリバンバンキャリーパミュパミュ.mp4 -vn -acodec copy ニンジャリバンバンキャリーパミュパミュ.m4a
ffmpeg version 0.10.7 Copyright (c) 2000-2013 the FFmpeg developers
built on Apr 29 2013 16:33:56 with gcc 4.5.4
configuration: --prefix=/usr --libdir=/usr/lib64 --shlibdir=/usr/lib64 --mandir=/usr/share/man --enable-shared --cc=x86_64-pc-linux-gnu-gcc --cxx=x86_64-pc-linux-gnu-g++ --ar=x86_64-pc-linux-gnu-ar --optflags='-mtune=native -O2 -pipe' --extra-cflags='-mtune=native -O2 -pipe' --extra-cxxflags='-mtune=native -O2 -pipe' --disable-static --enable-gpl --enable-version3 --enable-postproc --enable-avfilter --disable-stripping --disable-debug --disable-network --disable-vaapi --disable-vdpau --enable-libmp3lame --enable-libvo-aacenc --enable-libvorbis --enable-libx264 --enable-libxvid --disable-indev=v4l --disable-indev=v4l2 --disable-indev=oss --disable-indev=jack --enable-x11grab --enable-libpulse --disable-outdev=oss --enable-libfreetype --disable-amd3dnow --disable-amd3dnowext --disable-altivec --disable-avx --disable-mmx2 --disable-ssse3 --disable-vis --disable-neon --cpu=host --enable-hardcoded-tables
libavutil 51. 35.100 / 51. 35.100
libavcodec 53. 61.100 / 53. 61.100
libavformat 53. 32.100 / 53. 32.100
libavdevice 53. 4.100 / 53. 4.100
libavfilter 2. 61.100 / 2. 61.100
libswscale 2. 1.100 / 2. 1.100
libswresample 0. 6.100 / 0. 6.100
libpostproc 52. 0.100 / 52. 0.100
Input #0, mov,mp4,m4a,3gp,3g2,mj2, from 'ニンジャリバンバンキャリーパミュパミュ.mp4':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2013-04-08 12:52:24
Duration: 00:04:24.31, start: 0.000000, bitrate: 725 kb/s
Stream #0:0(und): Video: h264 (Constrained Baseline) (avc1 / 0x31637661), yuv420p, 640x360, 626 kb/s, 23.98 fps, 23.98 tbr, 48k tbn, 47.95 tbc
Metadata:
handler_name : VideoHandler
Stream #0:1(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, s16, 96 kb/s
Metadata:
creation_time : 2013-04-08 12:52:25
handler_name :
Output #0, ipod, to 'ニンジャリバンバンキャリーパミュパミュ.m4a':
Metadata:
major_brand : mp42
minor_version : 0
compatible_brands: isommp42
creation_time : 2013-04-08 12:52:24
encoder : Lavf53.32.100
Stream #0:0(und): Audio: aac (mp4a / 0x6134706D), 44100 Hz, stereo, 96 kb/s
Metadata:
creation_time : 2013-04-08 12:52:25
handler_name :
Stream mapping:
Stream #0:1 -> #0:0 (copy)
Press [q] to stop, [?] for help
size= 3143kB time=00:04:24.31 bitrate= 97.4kbits/s
video:0kB audio:3098kB global headers:0kB muxing overhead 1.460185%
cuomo@karky7 ~/m4a $
一つ一つコマンドを打つのは面倒なのでhaskellで片付ける
頑張ってhaskellで変換スクリプトをシコシコ作ってみました
第１引数にmp4のファイルがあるディレクトリを指定すると全部をm4aファイルに変換する優れものです
import System.Directory
import System.Environment (getArgs)
import System.Posix
import Control.Monad (forM, filterM)
import System.Process
import Data.List.Split
import System.Exit
main :: IO()
main = do
path <- getPath
fs <- getDirectoryContents path
fullpath <- filterM isFile $ map (\filepath -> path ++ filepath) fs
_ <- forM fullpath (\file ->
do (exitCode, stdout, stderr) <- readProcessWithExitCode "ffmpeg" (createArg file) []
case exitCode of
ExitFailure _ -> putStrLn stderr >> exitFailure
_ -> putStrLn $ "Convert OK: " ++ file)
putStrLn "Complete."
getPath :: IO String
getPath = do
path <- getArgs
return (head path)
createArg :: FilePath -> [String]
createArg fname = case splitOn "." fname of
[file, _] -> ["-i" , fname, "-vn", "-acodec", "copy", file ++ ".m4a"]
_ -> []
isFile :: FilePath -> IO Bool
isFile file = getFileStatus file >>= (\fs -> return $ not $ isDirectory fs)
実行結果すると、こんな感じですcuomo@karky7 ~ $ runhaskell convert.hs ~/mp4/ Convert OK: /home/cuomo/mp4/そのまま東へ-ファンモン.mp4 Convert OK: /home/cuomo/mp4/晴伝説-湘南乃風.mp4 Convert OK: /home/cuomo/mp4/虹-福山雅治.mp4 Convert OK: /home/cuomo/mp4/キセキ-GReeeeN.mp4 Convert OK: /home/cuomo/mp4/ワイルトアットハート-嵐.mp4 Convert OK: /home/cuomo/mp4/夏色-ゆす.mp4 Convert OK: /home/cuomo/mp4/ヘヒーローテーション-AKB48.mp4 Convert OK: /home/cuomo/mp4/JAMBOREE!!-AAA.mp4 Convert OK: /home/cuomo/mp4/あの紙ヒコーキくもり空わって-19.mp4 Convert OK: /home/cuomo/mp4/女々しくて-ゴールデンボンバー.mp4 Convert OK: /home/cuomo/mp4/栄光の架け橋-ゆず.mp4 Convert OK: /home/cuomo/mp4/PartyItUp-AAA.mp4 Convert OK: /home/cuomo/mp4/パンダヒーロー-初音ミク.mp4 Convert OK: /home/cuomo/mp4/走れ-ももいろクローバー.mp4 Convert OK: /home/cuomo/mp4/つけまつける-きゃりーぱみゅぱみゅ.mp4 Convert OK: /home/cuomo/mp4/PONPONPON-きゃりーぱみゅぱみゅ.mp4 Convert OK: /home/cuomo/mp4/あなたに-MONGOL800.mp4 Convert OK: /home/cuomo/mp4/にんじゃりばんばん-きゃりーぱみゅぱみゅ.mp4 Convert OK: /home/cuomo/mp4/Sunny Day Sunday-センチメンタル・バス.mp4 Convert OK: /home/cuomo/mp4/JOINT-RIPSLYME.mp4 Convert OK: /home/cuomo/mp4/ウルトラソウル-Bz.mp4 Convert OK: /home/cuomo/mp4/楽園ベイベー-RipSlyme.mp4 Convert OK: /home/cuomo/mp4/夢叶う-MONGOL800.mp4 Convert OK: /home/cuomo/mp4/高架線-ELLEGARDEN.mp4 Convert OK: /home/cuomo/mp4/ロコローション-オレンジレンジ.mp4 Convert OK: /home/cuomo/mp4/世界はそれを愛と呼ぶんだぜ-サンボマスター.mp4 Convert OK: /home/cuomo/mp4/日曜日よりの使者.mp4 Convert OK: /home/cuomo/mp4/マトリョシカ-初音ミク.mp4 Convert OK: /home/cuomo/mp4/SPARK-三代目.mp4 Convert OK: /home/cuomo/mp4/Sabotage-Beastie Boys.mp4 Convert OK: /home/cuomo/mp4/以心電信-オレンジレンジ.mp4 Convert OK: /home/cuomo/mp4/マツケンサンバII.mp4 Convert OK: /home/cuomo/mp4/Monster-嵐.mp4 Convert OK: /home/cuomo/mp4/フライングゲット-AKB48.mp4 Convert OK: /home/cuomo/mp4/爆音男-湘南乃風.mp4 Complete. cuomo@karky7 ~ $こんな感じでm4aファイルができあがる、Shellスクリプトで書いた方が早いような気がしますが...笑 ^^;
抜いたm4aがMacで聞けるか試してみる
これをMacで聞いてみる、と
ニンジャリバンバン、松ケンとか、聞けてる、とりあえずこれでOK、区民大会はGentoo >>= Macな音楽転送で何とかなりそうです。
