目录
1.官方宣传
一个完整的跨平台解决方案，用于录制，转换和流式传输音频和视频。FFmpeg是领先的多媒体框架，能够解码，编码， 转码，复用，解复用，流式传输，过滤和播放人类和机器创建的任何内容。它支持最晦涩难懂的古代格式，直至最前沿。无论它们是由某些标准委员会，社区还是公司设计的。它还具有高度可移植性：FFmpeg 在各种构建环境，机器架构和配置下，跨Linux，Mac OS X，Microsoft Windows，BSD，Solaris等编译，运行和传递我们的测试基础架构 FATE。
2.下载与安装
2.1 下载
官网：https://ffmpeg.zeranoe.com/builds/
- FFmpeg分为3个版本：
Static、Shared、Dev - 前两个版本可以直接在命令行中使用。包含了三个
exe:ffmpeg.exe，ffplay.exe，ffprobe.exe Static版本中的exe体积较大,那是因为相关的Dll都已经编译进exe里面去了。Shared版本中exe的体积相对小很多,是因为它们运行的时候还需要到相关的dll中调用相应的功能Dev版本用于开发,里面包含了库文件xxx.lib以及头文件xxx
本博主下载的是 ffmpeg-20181028-bdfd2e3-win64-static
2.2 安装
他没有安装程序，我们需要把包含exe的那个文件夹放入环境变量，重启电脑即可。
3.用法
3.1 ...\ffmpeg\bin 下三个exe的解释
借由雷神的 https://blog.csdn.net/leixiaohua1020/article/details/15811977，我们可以了解ffmpeg.exe、ffplay.exe和ffprobe.exe 的用法
3.1.1 ffmpeg.exe
ffmpeg是用于转码的应用程序。
一个简单的转码命令可以这样写：
将input.avi转码成output.ts，并设置视频的码率为640kbps
ffmpeg -i input.avi -b:v 640k output.ts具体的使用方法可以参考： ffmpeg参数中文详细解释
详细的使用说明（英文）：http://ffmpeg.org/ffmpeg.html
3.1.2 ffplay.exe
ffplay是用于播放的应用程序。
一个简单的播放命令可以这样写：
播放test.avi
ffplay test.avi
具体的使用方法可以参考：ffplay的快捷键以及选项
详细的使用说明（英文）：http://ffmpeg.org/ffplay.html
3.1.3 ffprobe.exe
ffprobe是用于查看文件格式的应用程序。
这个就不多介绍了。
详细的使用说明（英文）：http://ffmpeg.org/ffprobe.html
3.2 ffmpeg 命令行
在cmd中 ffmpeg.exe -h 查看ffmpeg说明，可以看到：
usage: ffmpeg [options] [[infile options] -i infile]... {[outfile options] outfile}...
Getting help:
-h -- print basic options
-h long -- print more options
-h full -- print all options (including all format and codec specific options, very long)
-h type=name -- print all options for the named decoder/encoder/demuxer/muxer/filter/bsf
See man ffmpeg for detailed description of the options.
Print help / information / capabilities:
-L show license
-h topic show help
-? topic show help
-help topic show help
--help topic show help
-version show version
-buildconf show build configuration
-formats show available formats
-muxers show available muxers
-demuxers show available demuxers
-devices show available devices
-codecs show available codecs
-decoders show available decoders
-encoders show available encoders
-bsfs show available bit stream filters
-protocols show available protocols
-filters show available filters
-pix_fmts show available pixel formats
-layouts show standard channel layouts
-sample_fmts show available audio sample formats
-colors show available color names
-sources device list sources of the input device
-sinks device list sinks of the output device
-hwaccels show available HW acceleration methods
Global options (affect whole program instead of just one file:
-loglevel loglevel set logging level
-v loglevel set logging level
-report generate a report
-max_alloc bytes set maximum size of a single allocated block
-y overwrite output files
-n never overwrite output files
-ignore_unknown Ignore unknown stream types
-filter_threads number of non-complex filter threads
-filter_complex_threads number of threads for -filter_complex
-stats print progress report during encoding
-max_error_rate maximum error rate ratio of errors (0.0: no errors, 1.0: 100% errors) above which ffmpeg returns an error instead of success.
-bits_per_raw_sample number set the number of bits per raw sample
-vol volume change audio volume (256=normal)
Per-file main options:
-f fmt force format
-c codec codec name
-codec codec codec name
-pre preset preset name
-map_metadata outfile[,metadata]:infile[,metadata] set metadata information of outfile from infile
-t duration record or transcode "duration" seconds of audio/video
-to time_stop record or transcode stop time
-fs limit_size set the limit file size in bytes
-ss time_off set the start time offset
-sseof time_off set the start time offset relative to EOF
-seek_timestamp enable/disable seeking by timestamp with -ss
-timestamp time set the recording timestamp ('now' to set the current time)
-metadata string=string add metadata
-program title=string:st=number... add program with specified streams
-target type specify target file type ("vcd", "svcd", "dvd", "dv" or "dv50" with optional prefixes "pal-", "ntsc-" or "film-")
-apad audio pad
-frames number set the number of frames to output
-filter filter_graph set stream filtergraph
-filter_script filename read stream filtergraph description from a file
-reinit_filter reinit filtergraph on input parameter changes
-discard discard
-disposition disposition
Video options:
-vframes number set the number of video frames to output
-r rate set frame rate (Hz value, fraction or abbreviation)
-s size set frame size (WxH or abbreviation)
-aspect aspect set aspect ratio (4:3, 16:9 or 1.3333, 1.7777)
-bits_per_raw_sample number set the number of bits per raw sample
-vn disable video
-vcodec codec force video codec ('copy' to copy stream)
-timecode hh:mm:ss[:;.]ff set initial TimeCode value.
-pass n select the pass number (1 to 3)
-vf filter_graph set video filters
-ab bitrate audio bitrate (please use -b:a)
-b bitrate video bitrate (please use -b:v)
-dn disable data
Audio options:
-aframes number set the number of audio frames to output
-aq quality set audio quality (codec-specific)
-ar rate set audio sampling rate (in Hz)
-ac channels set number of audio channels
-an disable audio
-acodec codec force audio codec ('copy' to copy stream)
-vol volume change audio volume (256=normal)
-af filter_graph set audio filters
Subtitle options:
-s size set frame size (WxH or abbreviation)
-sn disable subtitle
-scodec codec force subtitle codec ('copy' to copy stream)
-stag fourcc/tag force subtitle tag/fourcc
-fix_sub_duration fix subtitles duration
-canvas_size size set canvas size (WxH or abbreviation)
-spre preset set the subtitle options to the indicated preset4.思考：接下来我们该做什么？
博主从来没有见过-h出来这么多命令的exe，这简直就是在劝退所有初学者......ok，我先摸索摸索路子，船到桥头自然直嘛。记录一下，我找到一个中文版的教程https://www.longqi.cf/tools/2015/02/13/ffmpegcn/，看了一下，其实就是翻译，不过没乱码~感谢感谢，还有一个新一点的http://wiki.11ten.net/Resources/ffmpeg-%E4%B8%AD%E6%96%87%E6%96%87%E6%A1%A3.html。
接下来我们慢慢剖析这些命令行，没事，博主头铁。
参考
1.https://www.jianshu.com/p/7ed3be01228b
2.https://blog.csdn.net/leixiaohua1020/article/details/15811977