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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 08:28:07 +00:00
:PROPERTIES:
:ID: 9484532c-16c8-4b3c-8ca4-109396bbf2ef
:END:
Make the command line notes consistent Just the title anyways. It makes easier to find aside from the file name and also makes it clear in case I refer to them from other documents.
2021-06-20 02:22:13 +00:00
#+title: Command line: FFmpeg
Create the hierarchical notes The notes are mainly extracted from the daily fleeting notes which clutter some of the more important thoughts. I figured it would be better to create Dendron-inspired hierarchical notes. Also, some of the notes are updated. I also started to create my visual aids for whatever reason. ;p
2021-05-10 00:49:29 +00:00
#+date: "2021-05-09 16:40:50 +08:00"
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 08:28:07 +00:00
#+date_modified: "2021-07-20 23:30:49 +08:00"
Create the hierarchical notes The notes are mainly extracted from the daily fleeting notes which clutter some of the more important thoughts. I figured it would be better to create Dendron-inspired hierarchical notes. Also, some of the notes are updated. I also started to create my visual aids for whatever reason. ;p
2021-05-10 00:49:29 +00:00
#+language: en
Update my notebook as of 2021-06-05
2021-06-05 00:32:50 +00:00
#+property: header-args :eval no
Create the hierarchical notes The notes are mainly extracted from the daily fleeting notes which clutter some of the more important thoughts. I figured it would be better to create Dendron-inspired hierarchical notes. Also, some of the notes are updated. I also started to create my visual aids for whatever reason. ;p
2021-05-10 00:49:29 +00:00
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.
Update formatting on the command line notes Along with some extra updates for a note about GitHub Actions.
2021-07-10 14:20:08 +00:00
- =-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
Create the hierarchical notes The notes are mainly extracted from the daily fleeting notes which clutter some of the more important thoughts. I figured it would be better to create Dendron-inspired hierarchical notes. Also, some of the notes are updated. I also started to create my visual aids for whatever reason. ;p
2021-05-10 00:49:29 +00:00
Certain options have the option of specifying whether you're interacting with the audio or video track.
Update formatting on the command line notes Along with some extra updates for a note about GitHub Actions.
2021-07-10 14:20:08 +00:00
For example, =-codec:audio= (=-c:a=) to set the audio codec.
Create the hierarchical notes The notes are mainly extracted from the daily fleeting notes which clutter some of the more important thoughts. I figured it would be better to create Dendron-inspired hierarchical notes. Also, some of the notes are updated. I also started to create my visual aids for whatever reason. ;p
2021-05-10 00:49:29 +00:00
* Examples
FFmpeg is comprehensive and so needs some specific examples to fill my monkey brain.
** Convert an MP3 to OGG
#+begin_src shell
ffmpeg -i $INPUT.mp3 -o $OUTPUT.ogg
#+end_src
By default, FFmpeg will guess if certain things are missing.
Update my notes on stuff Some CLI tools, also forgot to commit to move the exercise solutions of SICP where it should be. The usual hierarchy notebook update.
2021-05-31 15:37:32 +00:00
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.
Create the hierarchical notes The notes are mainly extracted from the daily fleeting notes which clutter some of the more important thoughts. I figured it would be better to create Dendron-inspired hierarchical notes. Also, some of the notes are updated. I also started to create my visual aids for whatever reason. ;p
2021-05-10 00:49:29 +00:00
** Transrate an audio file
#+begin_src shell
ffmpeg -i $INPUT -c $CODE -b:a $BITRATE $OUTPUT
#+end_src
Update my notes on stuff Some CLI tools, also forgot to commit to move the exercise solutions of SICP where it should be. The usual hierarchy notebook update.
2021-05-31 15:37:32 +00:00
** List all available options
FFmpeg has compile options, heaps of them.
You may want to know what codecs are available.
#+begin_src shell :results silent
ffmpeg -codecs
#+end_src
It tends to be a large list so prepare to send it through a pager.
You should also know FFmpeg can print out devices.
#+begin_src shell :results silent
ffmpeg -devices
#+end_src
** Capture video device
Update my notebook as of 2021-06-05
2021-06-05 00:32:50 +00:00
#+begin_src shell
Update my notes on stuff Some CLI tools, also forgot to commit to move the exercise solutions of SICP where it should be. The usual hierarchy notebook update.
2021-05-31 15:37:32 +00:00
# Assuming /dev/video0 is your webcam.
ffmpeg -f video4linux2 -i /dev/video0 cringe-at-yourself.mpg
#+end_src
Update my notebook as of 2021-06-05
2021-06-05 00:32:50 +00:00
** Extract a segment from a file
The timestamps are essentially seeking to a file.
For more information, see [[https://trac.ffmpeg.org/wiki/Seeking][FFmpeg documentation]].
#+begin_src shell
ffmpeg -nostdin -i $INPUT -ss 00:05:22 -to 00:22:43 $OUTPUT
#+end_src
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