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93 lines
2.2 KiB
Org Mode
93 lines
2.2 KiB
Org Mode
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:PROPERTIES:
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:ID: 9484532c-16c8-4b3c-8ca4-109396bbf2ef
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:END:
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#+title: Command line: FFmpeg
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#+date: "2021-05-09 16:40:50 +08:00"
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#+date_modified: "2021-07-20 23:30:49 +08:00"
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#+language: en
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#+property: header-args :eval no
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The swiss army knife for interacting with multimedia files (except images because ImageMagick).
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* Options
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The FFmpeg command line interface is mostly picky because of order.
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Whatever options are given will be processed with those options in order.
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- =-hide_banner= - hide the annoying banner
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- =-loglevel [level] | -v [level]= - set the verbosity level
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- =-codecs= - list all codecs
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- =-devices= - list all devices
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- =-i [file]= - the input file
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- =c [codec]= - set the codec
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- =-b [rate]= - set the bitrate
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- =-o [file]= - set the output
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Certain options have the option of specifying whether you're interacting with the audio or video track.
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For example, =-codec:audio= (=-c:a=) to set the audio codec.
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* Examples
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FFmpeg is comprehensive and so needs some specific examples to fill my monkey brain.
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** Convert an MP3 to OGG
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#+begin_src shell
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ffmpeg -i $INPUT.mp3 -o $OUTPUT.ogg
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#+end_src
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By default, FFmpeg will guess if certain things are missing.
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In this case, it guessed the input file is an MP3 and wants to convert OGG.
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Sometimes, it will also use default options for converting between two formats such as the default bitrate and codec.
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** Transrate an audio file
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#+begin_src shell
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ffmpeg -i $INPUT -c $CODE -b:a $BITRATE $OUTPUT
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#+end_src
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** List all available options
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FFmpeg has compile options, heaps of them.
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You may want to know what codecs are available.
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#+begin_src shell :results silent
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ffmpeg -codecs
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#+end_src
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It tends to be a large list so prepare to send it through a pager.
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You should also know FFmpeg can print out devices.
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#+begin_src shell :results silent
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ffmpeg -devices
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#+end_src
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** Capture video device
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#+begin_src shell
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# Assuming /dev/video0 is your webcam.
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ffmpeg -f video4linux2 -i /dev/video0 cringe-at-yourself.mpg
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#+end_src
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** Extract a segment from a file
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The timestamps are essentially seeking to a file.
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For more information, see [[https://trac.ffmpeg.org/wiki/Seeking][FFmpeg documentation]].
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#+begin_src shell
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ffmpeg -nostdin -i $INPUT -ss 00:05:22 -to 00:22:43 $OUTPUT
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#+end_src
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