Convert to mp3 Using FFMPEG

In this example we will convert m4a audio files to mp3. But you can convert virtually any audio format.

$ mkdir converted
$ for f in *.m4a; do ffmpeg -i "$f" -codec:v copy -codec:a libmp3lame -q:a 2 converted/"${f%.m4a}.mp3"; done;
  • -q:a 2 means LAME’s option -V 2, which gives us a VBR MP3 audio stream with an average stereo bitrate of 170-210 kBit/s. See https://trac.ffmpeg.org/wiki/Encode/MP3 for more options.
  • make sure you convert to equal or lower quality (it would not make much sense to convert to better quality than the source)

Byobu Tmux Screen

Shortcuts

Function keys work by default only in byobu.

Create a new window

c-a a or F2

Move to the previous window

c-a p or F3

Move to the next window

c-a n or F4

Detach from the session and logout

c-a d or F6

Enter scrollback/search mode

c-a [  or F7

Rename the current window

c-a A or F8

Tell byobu to not set the terminal window title

export BYOBU_NO_TITLE=1
You can set the title of your terminal window by running
echo -ne "\033]0;${HOSTNAME%%.*}\007"

This will set your terminal title to the hostname your are on (without domain part). Add this to your $PROMPT_COMMAND to set it automatically with every command you run.

Organize your Photos by Date Using Exiftool

Find all photos without date information

$ exiftool -filename -filemodifydate -createdate -r -if '(not $datetimeoriginal) and $filetype eq "JPEG"' .

Set last created and modified to a specific date

$ find . -name "*.jpg" | while read filename;
exiftool "-AllDates=1986:11:05 12:00:00" "$filename";
done

Copy of the originals will be created. Remove *.jpg_original if everything went fine or add -overwrite_original parameter.

Timeshift

by one year

$ exiftool "-AllDates+=1:0:0 00:00:00" .

Rename your files to contain the date and time

they will be suffixed with -N if they have the same date and time

$ exiftool '-FileName<DateTimeOriginal' -d "%Y%m%d_%H%M%S%%-c.%%e" *.jpg
$ exiftool '-FileName<DateTimeOriginal' -d "%Y-%m-%d %H.%M.%S%%-c.%%e" *.jpg

Copy your photos in a folder structure organised by datetime

exiftool '-Directory<CreateDate' -d ~/Dropbox/Photos/%Y/%y%m -r .

ReplayGain your music using mp3gain

ReplayGain is the name of a technique invented to achieve the same perceived playback loudness of audio files. Read more on Hydrogenaudio.

Set all files to 92db – this is the most used loudness now-a-days (it’s recommended also in Serato DJ software and most streaming platforms seems to use same value). You might want to use 89db if you are listening on a Hi-Fi system – in this case just ignore the -d 3 option.

The suggested loudness is ~89, so we add 3.

mp3gain -d 3 -c -p -r *.mp3

or

mp3gain -s r -d 3 -c -p -r *.mp3

-s r this will ignore the replaygain information already stored in the file

-c will ignore clipping warning, use -k to lower the gain to not clip

-p preserve original timestamp of files

-r gain per track (as opposed to per album), it’s good for collections, best of, etc.

recursively apply gain to all your mp3 files

  • it works also for file names with spaces
find . -iname '*.mp3' -print0 | xargs -0 mp3gain -d 3 -c -p -r