基本帮助信息和功能

-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):全局选项，此参数影响全局而不是只是一个文件。

-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)