media_editing 2021.10.17.2018

media_editing
=============

setup
=====

.. code:: bash

pip install media_editing

Markdown_to_HTML.py
===================

This script recursively converts Markdown files at a specified directory
to HTML files, with options to include numbered sections, table of
contents, CSS and to output commands only, not execute.

Example usage with CSS specified is as follows:

.. code:: bash

cd my_writing_files_in_Markdown

CSS="https://raw.githack.com/wdbm/style/master/SS/bluescale.css"
Markdown_to_HTML.py --CSS="${CSS}"

images_to_video.py
==================

This script converts a list of image files to a video with the options
of specifying the image extension, a soundtrack file, an output filename
and a framerate.

text_to_QR_code.py
==================

This script converts specified text to a QR code of specified scale and
filepath and optionally displays the resulting QR code image using the
default image viewer.

vidgif.py
=========

This script converts a video to an animated GIF, with the option to
output commands only, not execute.

OCR of region of display
========================

.. code:: bash

sudo apt install imagemagick scrot tesseract-ocr

.. code:: bash

tmp="$(mktemp)"
scrot -s "${tmp}".png -q 100
mogrify -modulate 100,0 -resize 400% "${tmp}".png
tesseract "${tmp}".png "${tmp}" &> /dev/null
cat "${tmp}".txt

--------------

High Dynamic Resolution (HDR)
=============================

Luminance HDR
-------------

.. _setup-1:

setup
~~~~~

.. code:: bash

sudo apt update
sudo apt install luminance-hdr

settings used to combine a darker and a lighter image 2019-02-24
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

- tonemap

- operator: Reinhard ’05
- brightness: -10
- chromatic adaptation: 0
- light adaptation: 1

- process

- pre-gamma: 0.86

--------------

recording internal audio: audio-recorder
========================================

.. _setup-2:

setup
-----

.. code:: bash

sudo dpkg -i audio-recorder_1.7-5~xenial_amd64.deb

usage
-----

.. code:: bash

audio-recorder

- Under “Audio settings.”, select the source as something like “Clear
Chat Comfort USB Headset (Audio output)”.
- Select “Start recording”.

|image0|

--------------

FFmpeg
======

trim video using start and stop times without reencoding
--------------------------------------------------------

Note the ordering of the command line arguments and options.

.. code:: bash

filepath_1="Star.Wars.1977.Despecialized.720p.x264.AC3.5.1.mkv"
filepath_2="out.mkv"
start="01:40:33"
stop="01:54:48"

time ffmpeg -y -i "${filepath_1}" -ss "${start}" -to "${stop}" -c copy "${filepath_2}"

remove audio from video
-----------------------

The ``-an`` flag is used.

.. code:: bash

ffmpeg -i in.mkv -c copy -an out.mkv

--------------

ImageMagick
===========

change quality of directory of JPEG images
------------------------------------------

.. code:: bash

mogrify -quality 95 *.jpg

strip/remove an image of all profiles and comments using ImageMagick
--------------------------------------------------------------------

.. code:: bash

convert -strip image_1.png image_2.png

.. code:: bash

mogrify -strip *.jpg

create an image of specified width, height and color using ImageMagick
----------------------------------------------------------------------

Width is specified before height.

.. code:: bash

convert -size 100x100 xc:#000000 out.png

.. code:: bash

convert -size 100x100 xc:rgba\(255,0,0,0.4\) out.png

.. code:: bash

width_pixels="3495"
height_pixels="2160"
color="#eeeeee"
filepath="out.png"
convert -size "${width_pixels}"x"${height_pixels}" xc:"${color}" "${filepath}"

.. code:: bash

width_pixels="3107"
height_pixels="1920"
color="#eeeeee"
filepath="background.png"
convert -size "${width_pixels}"x"${height_pixels}" xc:"${color}" "${filepath}"

overlay one foreground image on the center of a background image using ImageMagick
----------------------------------------------------------------------------------

.. code:: bash

convert background.png -coalesce -gravity center -draw 'image over 0,0,0,0 "foreground.png"' out.png

.. code:: bash

filepath_foreground="foreground.png"
filepath_background="background.png"
filepath_output="out.png"

# not working, under development:
# time convert "${filepath_background}" -coalesce -gravity center -draw 'image over 0,0,0,0 \"${filepath_foreground}\"' "${filepath_output}"

The option ``-layers flatten`` may be worth considering.

reduce quality of images at working directory in batch, making new images at new directory
------------------------------------------------------------------------------------------

.. code:: bash

mkdir new
mogrify -path new -quality 80 -format jpg *.jpg

--------------

Inkscape
========

set up palettes for Inkscape
----------------------------

.. code:: bash

/usr/share/inkscape/palettes

convert bitmap to vector using Inkscape
---------------------------------------

- https://www.youtube.com/watch?v=SjCFRI3knhE

--------------

Calibre
=======

setup 2019-01-24T0350Z
----------------------

.. code:: bash

sudo -v && wget -nv -O- https://download.calibre-ebook.com/linux-installer.sh | sudo sh /dev/stdin

view ebook
==========

.. code:: bash

ebook-viewer book.epub

convert EPUB to MOBI using ebook-convert
========================================

.. code:: bash

ebook-convert book.epub book.mobi

convert LaTeX to HTML to EPUB
=============================

.. code:: bash

mk4ht htlatex book.tex 'xhtml,charset=utf-8,pmathml'
ebook-convert book.html book.epub

convert Markdown to EPUB
========================

.. code:: bash

ebook-convert book.md book.epub

--------------

music
=====

some music software and tools
-----------------------------

- Audacity
- Hydrogen
- `MidiEditor <https://github.com/markusschwenk/midieditor>`__
- `MusE <https://muse-sequencer.github.io>`__
- MuseScore
- `Online Sequencer <https://onlinesequencer.net>`__

--------------

.. |image0| image:: https://raw.githubusercontent.com/wdbm/media_editing/master/media/Audio_Recorder.png