ffmpeg静态库的裁剪

直接对ffmpeg的源码进行编译链接生成的静态库非常大，仅仅avcodec就有几十兆。因此根据我们自己的需求对ffmpeg进行裁剪是非常必要的。

先不说具体的，直接上代码。在ffmpeg源码的根目录下新建shell脚本，命名为ffmpeg_small(随便起的)，然后把下面的内容复制进去，修改执行权限，然后执行，大概十多分钟后就可以得到裁剪后的ffmpeg静态库啦。经过验证，生成的libavcodec.a仅有2MB，libavdevice仅有7.5KB，libavfilter仅有192.4KB，libavformat.a仅有450.2KB，libavutil为298.2KB。

另外需要说明的是，为了使得生成的静态库可以对视频进行h264编码，对音频进行aac编码，我们需要对ffmpeg添加x264和aac支持，因此需要下载编译x264和vo-aacenc的源码。x264源码从git上下载就行，vo-aacenc可以在bitbucket下载：vo-aacenc源码下载。

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#!/bin/sh
./configure --enable-gpl --enable-nonfree --enable-version3 --enable-small\
--disable-encoders --enable-libx264 --enable-libvo-aacenc --enable-encoder=libx264 --enable-encoder=libvo_aacenc\
--disable-muxers --enable-muxer=mov --enable-muxer=mp4 --enable-muxer=avi\
--disable-decoders --enable-decoder=aac --enable-decoder=aac_latm --enable-decoder=h264 --enable-decoder=mpeg4\
--disable-filters --enable-filter=anull --enable-filter=null --enable-filter=aresample --enable-filter=pad --enable-filter=scale --enable-filter=overlay --enable-filter=amix --enable-filter=aresample\
--disable-demuxers --enable-demuxer=h264 --enable-demuxer=avi --enable-demuxer=mpc --enable-demuxer=mov\
--disable-parsers --enable-parser=aac --enable-parser=h264\
--disable-protocols --enable-protocol=file\
--disable-bsfs --enable-bsf=aac_adtstoasc --enable-bsf=h264_mp4toannexb\
--disable-indevs\
--disable-outdevs --disable-ffprobe --disable-ffmpeg --disable-ffplay --disable-ffserver --disable-debug
make
sudo make install

我们可以比较./configure之后输出的信息来判断我们到底裁剪到了什么东西。

如果我们不进行裁剪，直接./configure 输出的结果如下：

我们可以看到不管是decoder还是encoder或者filter或者protocal我们都Enable了一大堆，在实际应用中我们完全不需要这么全面的库。

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<pre name="code" class="html">nstall prefix /usr/local
source path .
C compiler gcc
C library glibc
ARCH x86 (generic)
big-endian no
runtime cpu detection yes
yasm yes
MMX enabled yes
MMXEXT enabled yes
3DNow! enabled yes
3DNow! extended enabled yes
SSE enabled yes
SSSE3 enabled yes
AVX enabled yes
XOP enabled yes
FMA3 enabled yes
FMA4 enabled yes
i686 features enabled yes
CMOV is fast no
EBX available yes
EBP available yes
debug symbols yes
strip symbols yes
optimize for size no
optimizations yes
static yes
shared no
postprocessing support no
new filter support yes
network support yes
threading support pthreads
safe bitstream reader yes
SDL support no
opencl enabled no
texi2html enabled no
perl enabled yes
pod2man enabled yes
makeinfo enabled no
makeinfo supports HTML no
External libraries:
iconv
Enabled decoders:
aac bink h264
aac_latm binkaudio_dct hevc
aasc binkaudio_rdft hnm4_video
ac3 bintext huffyuv
ac3_fixed bmp iac
adpcm_4xm bmv_audio idcin
adpcm_adx bmv_video idf
adpcm_afc brender_pix iff_byterun1
adpcm_ct c93 iff_ilbm
adpcm_dtk cavs imc
adpcm_ea cdgraphics indeo2
adpcm_ea_maxis_xa cdxl indeo3
adpcm_ea_r1 cinepak indeo4
adpcm_ea_r2 cljr indeo5
adpcm_ea_r3 cllc interplay_dpcm
adpcm_ea_xas comfortnoise interplay_video
adpcm_g722 cook jacosub
adpcm_g726 cpia jpeg2000
adpcm_g726le cscd jpegls
adpcm_ima_amv cyuv jv
adpcm_ima_apc dca kgv1
adpcm_ima_dk3 dfa kmvc
adpcm_ima_dk4 dirac lagarith
adpcm_ima_ea_eacs dnxhd loco
adpcm_ima_ea_sead dpx mace3
adpcm_ima_iss dsd_lsbf mace6
adpcm_ima_oki dsd_lsbf_planar mdec
adpcm_ima_qt dsd_msbf metasound
adpcm_ima_rad dsd_msbf_planar microdvd
adpcm_ima_smjpeg dsicinaudio mimic
adpcm_ima_wav dsicinvideo mjpeg
adpcm_ima_ws dvbsub mjpegb
adpcm_ms dvdsub mlp
adpcm_sbpro_2 dvvideo mmvideo
adpcm_sbpro_3 dxtory motionpixels
adpcm_sbpro_4 eac3 movtext
adpcm_swf eacmv mp1
adpcm_thp eamad mp1float
adpcm_vima eatgq mp2
adpcm_xa eatgv mp2float
adpcm_yamaha eatqi mp3
aic eightbps mp3adu
alac eightsvx_exp mp3adufloat
alias_pix eightsvx_fib mp3float
als escape124 mp3on4
amrnb escape130 mp3on4float
amrwb evrc mpc7
amv ffv1 mpc8
anm ffvhuff mpeg1video
ansi ffwavesynth mpeg2video
ape fic mpeg4
ass flac mpegvideo
asv1 flic mpl2
asv2 flv msa1
atrac1 fourxm msmpeg4v1
atrac3 fraps msmpeg4v2
atrac3p frwu msmpeg4v3
aura g723_1 msrle
aura2 g729 mss1
avrn gif mss2
avrp gsm msvideo1
avs gsm_ms mszh
avui h261 mts2
ayuv h263 mvc1
bethsoftvid h263i mvc2
bfi h263p mxpeg
nellymoser ra_144 ulti
nuv ra_288 utvideo
on2avc ralf v210
opus rawvideo v210x
paf_audio realtext v308
paf_video rl2 v408
pam roq v410
pbm roq_dpcm vb
pcm_alaw rpza vble
pcm_bluray rv10 vc1
pcm_dvd rv20 vc1image
pcm_f32be rv30 vcr1
pcm_f32le rv40 vima
pcm_f64be s302m vmdaudio
pcm_f64le sami vmdvideo
pcm_lxf sanm vmnc
pcm_mulaw sgi vorbis
pcm_s16be sgirle vp3
pcm_s16be_planar shorten vp5
pcm_s16le sipr vp6
pcm_s16le_planar smackaud vp6a
pcm_s24be smacker vp6f
pcm_s24daud smc vp7
pcm_s24le smvjpeg vp8
pcm_s24le_planar snow vp9
pcm_s32be sol_dpcm vplayer
pcm_s32le sonic vqa
pcm_s32le_planar sp5x wavpack
pcm_s8 srt webp
pcm_s8_planar ssa webvtt
pcm_u16be stl wmalossless
pcm_u16le subrip wmapro
pcm_u24be subviewer wmav1
pcm_u24le subviewer1 wmav2
pcm_u32be sunrast wmavoice
pcm_u32le svq1 wmv1
pcm_u8 svq3 wmv2
pcm_zork tak wmv3
pcx targa wmv3image
pgm targa_y216 wnv1
pgmyuv text ws_snd1
pgssub theora xan_dpcm
pictor thp xan_wc3
pjs tiertexseqvideo xan_wc4
ppm tiff xbin
prores tmv xbm
prores_lgpl truehd xface
ptx truemotion1 xl
qcelp truemotion2 xsub
qdm2 truespeech xwd
qdraw tscc2 y41p
qpeg tta yop
qtrle twinvq yuv4
r10k txd zero12v
r210
Enabled encoders:
a64multi jpegls ppm
a64multi5 ljpeg prores
aac mjpeg prores_aw
ac3 movtext prores_ks
ac3_fixed mp2 qtrle
adpcm_adx mp2fixed r10k
adpcm_g722 mpeg1video r210
adpcm_g726 mpeg2video ra_144
adpcm_ima_qt mpeg4 rawvideo
adpcm_ima_wav msmpeg4v2 roq
adpcm_ms msmpeg4v3 roq_dpcm
adpcm_swf msvideo1 rv10
adpcm_yamaha nellymoser rv20
alac pam s302m
alias_pix pbm sgi
amv pcm_alaw snow
ass pcm_f32be sonic
asv1 pcm_f32le sonic_ls
asv2 pcm_f64be srt
avrp pcm_f64le ssa
avui pcm_mulaw subrip
ayuv pcm_s16be sunrast
bmp pcm_s16be_planar svq1
cinepak pcm_s16le targa
cljr pcm_s16le_planar tiff
comfortnoise pcm_s24be tta
dca pcm_s24daud utvideo
dnxhd pcm_s24le v210
dpx pcm_s24le_planar v308
dvbsub pcm_s32be v408
dvdsub pcm_s32le v410
dvvideo pcm_s32le_planar vorbis
eac3 pcm_s8 wavpack
ffv1 pcm_s8_planar webvtt
ffvhuff pcm_u16be wmav1
flac pcm_u16le wmav2
flv pcm_u24be wmv1
g723_1 pcm_u24le wmv2
gif pcm_u32be xbm
h261 pcm_u32le xface
h263 pcm_u8 xsub
h263p pcx xwd
huffyuv pgm y41p
jpeg2000 pgmyuv yuv4
Enabled hwaccels:
Enabled parsers:
aac dvd_nav mpegvideo
aac_latm dvdsub opus
ac3 flac png
adx gsm pnm
bmp h261 rv30
cavsvideo h263 rv40
cook h264 tak
dca hevc vc1
dirac mjpeg vorbis
dnxhd mlp vp3
dpx mpeg4video vp8
dvbsub mpegaudio vp9
Enabled demuxers:
aac h263 nc
ac3 h264 nistsphere
act hevc nsv
adf hls nut
adp hnm nuv
adx ico ogg
aea idcin oma
afc idf paf
aiff iff pcm_alaw
amr ilbc pcm_f32be
anm image2 pcm_f32le
apc image2_alias_pix pcm_f64be
ape image2_brender_pix pcm_f64le
aqtitle image2pipe pcm_mulaw
asf image_bmp_pipe pcm_s16be
ass image_dpx_pipe pcm_s16le
ast image_exr_pipe pcm_s24be
au image_j2k_pipe pcm_s24le
avi image_jpeg_pipe pcm_s32be
avr image_jpegls_pipe pcm_s32le
avs image_pictor_pipe pcm_s8
bethsoftvid image_png_pipe pcm_u16be
bfi image_sgi_pipe pcm_u16le
bink image_sunrast_pipe pcm_u24be
bintext image_tiff_pipe pcm_u24le
bit image_webp_pipe pcm_u32be
bmv ingenient pcm_u32le
boa ipmovie pcm_u8
brstm ircam pjs
c93 iss pmp
caf iv8 pva
cavsvideo ivf pvf
cdg jacosub qcp
cdxl jv r3d
cine latm rawvideo
concat live_flv realtext
data lmlm4 redspark
daud loas rl2
dfa lrc rm
dirac lvf roq
dnxhd lxf rpl
dsf m4v rsd
dsicin matroska rso
dts mgsts rtp
dtshd microdvd rtsp
dv mjpeg sami
dxa mlp sap
ea mlv sbg
ea_cdata mm sdp
eac3 mmf sdr2
epaf mov segafilm
ffm mp3 shorten
ffmetadata mpc siff
filmstrip mpc8 sln
flac mpegps smacker
flic mpegts smjpeg
flv mpegtsraw smush
fourxm mpegvideo sol
frm mpl2 sox
g722 mpsub spdif
g723_1 msnwc_tcp srt
g729 mtv stl
gif mv str
gsm mvi subviewer
gxf mxf subviewer1
h261 mxg sup
swf vc1t webvtt
tak vivo wsaud
tedcaptions vmd wsvqa
thp vobsub wtv
tiertexseq voc wv
tmv vplayer xa
truehd vqf xbin
tta w64 xmv
tty wav xwma
txd wc3 yop
vc1 webm_dash_manifest yuv4mpegpipe
Enabled muxers:
a64 image2pipe pcm_s24be
ac3 ipod pcm_s24le
adts ircam pcm_s32be
adx ismv pcm_s32le
aiff ivf pcm_s8
amr jacosub pcm_u16be
asf latm pcm_u16le
asf_stream lrc pcm_u24be
ass m4v pcm_u24le
ast matroska pcm_u32be
au matroska_audio pcm_u32le
avi md5 pcm_u8
avm2 microdvd psp
bit mjpeg rawvideo
caf mkvtimestamp_v2 rm
cavsvideo mlp roq
crc mmf rso
dash mov rtp
data mp2 rtsp
daud mp3 sap
dirac mp4 segment
dnxhd mpeg1system smjpeg
dts mpeg1vcd smoothstreaming
dv mpeg1video sox
eac3 mpeg2dvd spdif
f4v mpeg2svcd spx
ffm mpeg2video srt
ffmetadata mpeg2vob stream_segment
filmstrip mpegts swf
flac mpjpeg tee
flv mxf tg2
framecrc mxf_d10 tgp
framemd5 null truehd
g722 nut uncodedframecrc
g723_1 oga vc1
gif ogg vc1t
gxf oma voc
h261 opus w64
h263 pcm_alaw wav
h264 pcm_f32be webm
hds pcm_f32le webm_dash_manifest
hevc pcm_f64be webp
hls pcm_f64le webvtt
ico pcm_mulaw wtv
ilbc pcm_s16be wv
image2 pcm_s16le yuv4mpegpipe
Enabled protocols:
cache http rtmpt
concat httpproxy rtp
crypto icecast srtp
data md5 subfile
ffrtmphttp mmsh tcp
file mmst udp
ftp pipe udplite
gopher rtmp unix
hls
Enabled filters:
adelay crop nullsrc
aecho curves overlay
aeval dctdnoiz pad
aevalsrc decimate pan
afade dejudder perms
aformat deshake pixdesctest
ainterleave drawbox psnr
allpass drawgrid removelogo
alphaextract earwax replaygain
alphamerge edgedetect rgbtestsrc
amerge elbg rotate
amix equalizer scale
amovie extractplanes select
anull fade sendcmd
anullsink field separatefields
anullsrc fieldmatch setdar
apad fieldorder setfield
aperms flanger setpts
aphaser format setsar
aresample fps settb
aselect framepack showcqt
asendcmd framestep showinfo
asetnsamples gradfun showspectrum
asetpts haldclut showwaves
asetrate haldclutsrc shuffleplanes
asettb hflip signalstats
ashowinfo highpass silencedetect
asplit histogram silenceremove
astats hqx sine
astreamsync hue smptebars
atempo idet smptehdbars
atrim il split
avectorscope interleave swapuv
bandpass join telecine
bandreject lenscorrection testsrc
bass life thumbnail
bbox lowpass tile
biquad lut transpose
blackdetect lut3d treble
blend lutrgb trim
cellauto lutyuv unsharp
channelmap mandelbrot vflip
channelsplit mergeplanes vignette
codecview movie volume
color negate volumedetect
colorbalance noformat w3fdif
colorchannelmixer noise xbr
compand null yadif
concat nullsink zoompan
copy
Enabled bsfs:
aac_adtstoasc imx_dump_header mp3_header_decompress
chomp mjpeg2jpeg noise
dump_extradata mjpega_dump_header remove_extradata
h264_mp4toannexb mov2textsub text2movsub
Enabled indevs:
dv1394 lavfi v4l2
fbdev oss
Enabled outdevs:
fbdev oss v4l2
License: LGPL version 2.1 or later
Creating config.mak, config.h, and doc/config.texi...
config.h is unchanged
config.asm is unchanged
libavutil/avconfig.h is unchanged

如果我们对ffmpeg按照上文进行裁剪，则./configure输出的信息是这样的：
比起之前的一堆东西，裁剪之后的静态库只是有目的的Enbale了一小部分编码器和解码器，filters和muxers也去掉了大部分，因此会变得很小。

install prefix            /usr/local
source path               .
C compiler                gcc
C library                 glibc
ARCH                      x86 (generic)
big-endian                no
runtime cpu detection     yes
yasm                      yes
MMX enabled               yes
MMXEXT enabled            yes
3DNow! enabled            yes
3DNow! extended enabled   yes
SSE enabled               yes
SSSE3 enabled             yes
AVX enabled               yes
XOP enabled               yes
FMA3 enabled              yes
FMA4 enabled              yes
i686 features enabled     yes
CMOV is fast              no
EBX available             yes
EBP available             yes
debug symbols             no
strip symbols             yes
optimize for size         yes
optimizations             yes
static                    yes
shared                    yes
postprocessing support    yes
new filter support        yes
network support           no
threading support         pthreads
safe bitstream reader     yes
SDL support               no
opencl enabled            no
texi2html enabled         no
perl enabled              yes
pod2man enabled           yes
makeinfo enabled          no
makeinfo supports HTML    no

External libraries:
iconv libvo_aacenc libx264

Enabled decoders:
aac h263 mpeg4
aac_latm h264

Enabled encoders:
libvo_aacenc libx264

Enabled hwaccels:

Enabled parsers:
aac ac3 h264
aac_latm h263 mpeg4video

Enabled demuxers:
avi mov mpc
h264

Enabled muxers:
avi mov mp4

Enabled protocols:
file

Enabled filters:
amix           color           pad
anull           null           scale
aresample       overlay

Enabled bsfs:
aac_adtstoasc h264_mp4toannexb

Enabled indevs:

Enabled outdevs:

License: nonfree and unredistributable
Creating config.mak, config.h, and doc/config.texi...
config.h is unchanged
config.asm is unchanged
libavutil/avconfig.h is unchanged

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