foodogsquared/wiki
1
0
Fork 0
mirror of https://github.com/foo-dogsquared/wiki.git synced 2025-01-30 22:57:59 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity
master
wiki/notebook/cli.ffmpeg.org
Gabriel Arazas b088086b06 Merge evergreen notes into the notebook 
Now, it's all under the notebook umbrella. Seems to be appropriate as it
is just my notes after all.

I also updated some notes from there. I didn't keep track of what it is
this time. Something about more learning notes extracted from my
"Learning how to learn" course notes and then some. Lack of time and
hurriness just makes it difficult to track but it should be under
version control already.
2021-07-21 16:28:07 +08:00

2.2 KiB
Raw Permalink Blame History

Command line: FFmpeg

The swiss army knife for interacting with multimedia files (except images because ImageMagick).

Options

The FFmpeg command line interface is mostly picky because of order. Whatever options are given will be processed with those options in order.

  • -hide_banner - hide the annoying banner
  • -loglevel [level] | -v [level] - set the verbosity level
  • -codecs - list all codecs
  • -devices - list all devices
  • -i [file] - the input file
  • c [codec] - set the codec
  • -b [rate] - set the bitrate
  • -o [file] - set the output

Certain options have the option of specifying whether you're interacting with the audio or video track. For example, -codec:audio (-c:a) to set the audio codec.

Examples

FFmpeg is comprehensive and so needs some specific examples to fill my monkey brain.

Convert an MP3 to OGG 

ffmpeg -i $INPUT.mp3 -o $OUTPUT.ogg

By default, FFmpeg will guess if certain things are missing. In this case, it guessed the input file is an MP3 and wants to convert OGG. Sometimes, it will also use default options for converting between two formats such as the default bitrate and codec.

Transrate an audio file 

ffmpeg -i $INPUT -c $CODE -b:a $BITRATE $OUTPUT

List all available options

FFmpeg has compile options, heaps of them. You may want to know what codecs are available.

ffmpeg -codecs

It tends to be a large list so prepare to send it through a pager.

You should also know FFmpeg can print out devices.

ffmpeg -devices

Capture video device 

# Assuming /dev/video0 is your webcam.
ffmpeg -f video4linux2 -i /dev/video0 cringe-at-yourself.mpg

Extract a segment from a file

The timestamps are essentially seeking to a file. For more information, see FFmpeg documentation.

ffmpeg -nostdin -i $INPUT -ss 00:05:22 -to 00:22:43 $OUTPUT