编解码类

功能

-f

指定格式，包括视频和音频

-i

输入文件名

-title string

标题

-timestamp time

时间戳

-author string

作者

-copyright string

版权信息

-comment string

评论

输出打印类

功能

-h

打印基本选项

-h long

打印更多选项

-h full

打印所有的选项，包括格式和编码。

-version

显示版本

-formats

显示可以使用的格式

-codecs

显示可用编码

-decoders

显示解码器

-encoders

显示编码器

-bsfs

显示可用位流过滤器

-protocols

显示可用协议

-filters

显示可用过滤器

-pix_fmts

显示可用点格式

-layouts

显示标准通道布局

-sample_fmts

显示可用音频采样格式

全局选项

功能

-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            

do not overwrite output files

-stats          

print progress report during encoding

-bits_per_raw_sample number

设置每个采样点的位数

-vol volume     

改变音量 (256=normal)

单个文件的主要选项

功能

-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     

持续时间

-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

-timestamp time  

set the recording timestamp (‘now‘ to set the current time)

-metadata string=string 

add metadata

-target type    

specify target file type ("vcd", "svcd", "dvd", "dv", "dv50", "pal-vcd", "ntsc-svcd", ...)

-frames number 

set the number of frames to record

-filter filter_graph 

set stream filtergraph

-filter_script filename

read stream filtergraph description from a file

-reinit_filter 

reinit filtergraph on input parameter changes

Video options:

0

-vframes number 

set the number of video frames to record

-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

-b bitrate      

video bitrate (please use -b:v)

-dn            

disable data

Audio options:

-aframes number

set the number of audio frames to record

-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 preset