[trans]在CentOS 5上安装FFMPEG#echo /usr/lib /etc/ld.so.conf#ldconfig到这基本就安装完了最基本的
[trans]在CentOS 5上安装FFMPEG
#echo "/usr/lib" >> /etc/ld.so.conf
#ldconfig
到这基本就安装完了
最基本的几个命令(一定要了解的)
显示支持的格式,不过好象加参数时，加其中的会有问题，看来参数和支持的格式是不一样的
$ ffmpeg -formats?
显示视频的相关信息,如时长,文件声音和视频格式之类的信息
ffmpeg -i abc.ts
查看可以加什么参数?
ffmpeg -h
mplayer获取影片信息
mplayer -identify movie-filename -nosound -vc dummy -vo null
使用ffmpeg从视频中抓图
ffmpeg -i 原视频文件路径 -y -f image2 -ss 8 -t 0.001 -s 图象大小(400×300) 图片存放路径
使用ffmpeg给视频转换成flv
ffmpeg -i 原视频文件路径 -o 目标文件路径 -of lavf -oac mp3lame -lameopts abr:br=56 -ovc lavc -lavcopts vcodec=flv:vbitrate=视频码流:mbd=2:mv0:trell:v4mv:cbp:last_pred=3:dia=4:cmp=6:vb_strategy=1 -vf scale=高:宽 -ofps 12 -srate 22050′)
ffmpeg 00:04:00 -t 00:08:00 -i -vcodec copy -acodec copy aaa.avi
FAQ
1.出现如下提示
-soname,libx264.so.65 -lm -lpthread -lgpac_static -s
/usr/bin/ld: cannot find -lgpac_static
collect2: ld returned 1 exit status
make: *** [libx264.so.65] Error 1
解决方法
yum install zlib-devel
wget http://internap.dl.sourceforge.net/sourceforge/gpac/gpac-0.4.5.tar.gz
wget http://internap.dl.sourceforge.net/sourceforge/gpac/gpac_extra_libs-0.4.5.tar.gz
tar -zxf gpac-0.4.5.tar.gz
tar -zxf gpac_extra_libs-0.4.5.tar.gz
cd gpac_extra_libs
cp -r * ../gpac/extra_lib
cd ../gpac
chmod +x configure
./configure
make lib
make apps
make install-lib
make install
cp bin/gcc/libgpac.so /usr/lib
注意,使用下面的参数出错
–enable-liba52 –enable-liba52bin
查看源码发现中包括了ac3
为了查找方便，把ffmpeg中的参数都列出来
参数英文说明-Lshow license-hshow help-versionshow version-formats显示可以使用的格式,编码,协议-f强行设置输出格式[fmt]-i输入文件名[filename]-y不询问直接覆盖输出文件-mapset input stream mapping,file:stream[:syncfile:syncstream]-map_meta_dataset meta data information of outfile from infile,outfile:infile-tset the recording time[duration]-fsset the limit file size［limit_size］-ssset the start time offset[time_off]-itsoffsetset the input ts offset[time_off]-title视频文件标题[string]-timestampset the timestamp[time]-authorset the author[string]-copyrightset the copyright[string]-commentset the comment[string]-albumset the album[string]-benchmarkadd timings for benchmarking-dumpdump each input packet-hexwhen dumping packets, also dump the payload-reread input at native frame rate-loop_inputloop (current only works with images)-loop_outputnumber of times to loop output in formats that support looping (0 loops forever)-vcontrol amount of logging[verbose]-targetspecify target file type (”vcd”, “svcd”, “dvd”, “dv”, “dv50″, “pal-vcd”, “ntsc-svcd”, …)[type]-threadsthread count[count]-vsyncvideo sync method-asyncaudio sync method-vglobalvideo global header storage type-copytscopy timestamps-shortestfinish encoding within shortest input-dts_delta_thresholdtimestamp discontinuity delta threshold以下是视频相关的命令-vframes按所提供的帧数对文件解码（例ffmpeg -i test5.flv -r 15 -s 384*288 -y -vframes 1 photos.flv）[num]-aframesset the number of audio frames to record[num]-dframesset the number of data frames to record[num]-r设置帧速率，每秒多少帧 (Hz value, fraction or abbreviation)[rate]-s设置视频的宽度和高度，格式为320×240，320*240,320:240都可以-aspectset aspect ratio (4:3, 16:9 or 1.3333, 1.7777)[aspect]-pix_fmtset pixel format[format]-croptopset top crop band size (in pixels)[size]-cropbottom“set bottom crop band size (in pixels)[size]-cropleftset left crop band size (in pixels)[size]-croprightset right crop band size (in pixels)[size]-padtopset top pad band size (in pixels)[size]-padbottomset bottom pad band size (in pixels)［size］-padleftset left pad band size (in pixels)［size］-padrightset right pad band size (in pixels)[size]-padcolorset color of pad bands (Hex 000000 thru FFFFFF)[color]-intrause only intra frames-vndisable video-vdtdiscard threshold[n]-qscaleuse fixed video quantizer scale (VBR)[q]-qdiffmax difference between the quantizer scale (VBR)[q]-rc_eqset rate control equation[equation]-rc_overriderate control override for specific intervals[override]-vcodecforce video codec (’copy’ to copy stream)［codec］-meset motion estimation method[method]-me_thresholdmotion estimaton threshold-psset packet size in bits[size]-stricthow strictly to follow the standards[strictness]-samequse same video quality as source (implies VBR)-passselect the pass number (1 or 2)[n]-passlogfileselect two pass log file name[filename]-deinterlacedeinterlace pictures-psnrcalculate PSNR of compressed frames-vstatsdump video coding statistics to file-vhookinsert video processing module[module]-intra_matrixspecify intra matrix coeffs[matrix]-inter_matrixspecify inter matrix coeffs[matrix]-toptop=1/bottom=0/auto=-1 field first-dcintra_dc_precision[precision]-vtagforce video tag/fourcc[fourcc/tag]-newvideoadd a new video stream to the current output stream-qphistshow QP histogram以下是音频相关的命令-ab声音码流(in kbit/s)[bitrate]-aq声音品质(codec-specific)[quality]-ar声音的采样频率 (in Hz)[rate]-ac设置输出的声道数[channels]-an不输出声音-acodec设置输入声音的编码格式 (’copy’ to copy stream)[codec]-atagforce audio tag/fourcc[fourcc/tag]-volchange audio volume (256=normal)[volume]-newaudioadd a new audio stream to the current output stream-alangset the ISO 639 language code (3 letters) of the current audio stream[code]以下是字幕相关的命令-scodecforce subtitle codec (’copy’ to copy stream)[codec]-newsubtitleadd a new subtitle stream to the current output stream-slangset the ISO 639 language code (3 letters) of the current subtitle stream[code]以下是不常用的命令-vdset video grab device[device]-vcset video grab channel (DV1394 only)[channel]-tvstdset television standard (NTSC, PAL (SECAM))[standard]-adset audio device[device]-grabrequest grabbing using[format]-gdset grab device[device]-muxdelayset the maximum demux-decode delay[sec]-muxpreloadset the initial demux-decode delay[sec]-absf-vbsf-defaultgeneric catch all option
(ffmpeg参数说明)
http://hi.baidu.com/lhabc/blog/item/6745898f6316c6f1503d9229.html
