Home

Command-line tools conversion

• Get an image sequence from video using mplayer

  mplayer video.avi -vo png

• Extract audio from a video file

  mplayer video.avi -ao pcm:file=arquivo.wav

• Create a video file from a set of images

  mencoder ""mf://*.jpg"" -mf fps=12 -o output.avi -ovc copy -lavcopts vcodec=raw
  ffmpeg -framerate 24 -i *.png output.mp4

• Convert video to mp4

  avconv -i input.avi -c:v libx264 -crf 31 -preset fast -c:a libmp3lame output.mp4
  #compression is greater for higher crf values, see also different presets

• Split video file using ffmpeg

  ffmpeg -i input.avi -ss X -t Y -acodec copy -vcodec copy output.avi
  where X is the start time and Y the split length (in seconds or hh:mm:ss)

• midi to mp3

  timidity teste.mid -Ow -o - | ffmpeg -i - -acodec libmp3lame -ab 64k teste.mp3

• Convert all the files from a directory to another format file.

  for i in *.jpg; do
      convert $i ${i%.jpg}.eps
  done;

• Concatenate videos into a single one

  ffmpeg -f concat -safe 0 -i list.txt -c copy output.avi

  list.txt contains location of each file, one per line

• Extract audio from video

  ffmpeg -i input.mp4 -vn -acodec pcm_s16le output.wav

Programming

• Virtual Environment

• Python Related

  python3 -m venv vname
  source vname/bin/activate
  python3 -m pip install package
  python3 -m pip install package --upgrade
  python3 -m pip install package==

Misc

• bashrc

  export PATH="$PATH:/usr/java/jre1.8.0_251/bin/"
  export PYTHONPATH="${PYTHONPATH}:/home/folder/"
  alias sshdimap='sshfs login@host:/home/folder/ /dstFolder/ -p 2222 -o reconnect'

• Packages to install almost everything need to use latex

  sudo apt-get install texlive-latex-extra latex-beamer texlive-extra-utils texlive-latex3 texlive-xetex texlive-generic-extra texlive-math-extra texlive-extra-utils texlive-doc-pt texlive-common texlive-lang-portuguese texlive-formats-extra texlive-science texlive-latex-recommended texlive-pictures texlive-latex-extra texlive-fonts-extra texlive-bibtex-extra abntex

• Move mouse automatically

  while [ 1 ]; do
  xdotool mousemove_relative 1 1
  sleep 1
  done