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52 lines
1.2 KiB
Org Mode
52 lines
1.2 KiB
Org Mode
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#+title: FFmpeg
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#+date: "2021-05-09 16:40:50 +08:00"
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#+date_modified: "2021-05-09 17:13:35 +08:00"
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#+language: en
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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 you want to convert the
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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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