evadecker

import os

exportdir = 'new'

# Create a 'new' directory to put merged files
os.system('mkdir ' + exportdir)

# Iterate over files and combine using tiffcp
for file in os.listdir('.'):
  if file.endswith('@2x.tiff'):

evadecker

<div id="synth">
  <svg width="100%" viewBox="0 0 270 152" version="1.1" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink">
    <g id="synth-base">
      <rect id="Shadow" fill-opacity="0.1" fill="#000000" x="0" y="4" width="270" height="148" rx="12"></rect>
      <rect fill="#40445E" x="0" y="0" width="270" height="148" rx="12"></rect>
      <path d="M0,9.99832468 C0,4.47640243 4.47593818,0 10,0 L20,0 L20,148 L10,148 C4.4771525,148 0,143.530333 0,138.001675 L0,9.99832468 Z" id="Left-Endcap" fill="#272B43"></path>
      <path d="M250,0 L260,0 C265.522847,0 270,4.46966749 270,9.99832468 L270,138.001675 C270,143.523598 265.524062,148 260,148 L250,148 L250,0 Z" id="Right-Endcap" fill="#272B43"></path>
    </g>

    <g id="synth-keys" transform="translate(24.000000, 60.000000)">

evadecker

# Calculations courtesy of http://www.microsoftbob.com/post/Adjusting-Pitch-for-MP3-Files-with-FFmpeg

# Up half step
ffmpeg -i input.wav -filter:a "asetrate=r=46722.3224612449211671764955071340,atempo=0.94387431268169349664191315" output_up_halfstep.wav

# Up whole step
ffmpeg -i input.wav -filter:a "asetrate=r=49500.5763304433484812188074908520,atempo=0.8908987181403393047402262055" output_up_wholestep.wav

# Up 3 half steps
ffmpeg -i input.wav -filter:a "asetrate=r=52444.0337716199990422417487017170,atempo=0.84089641525371454303112547623321" output_up_3halfsteps.wav

evadecker

# Command to lower the bitrate of an mp3 using FFMPEG

# Options:
#   Low: 96k
#   Medium (Radio quality): 128k
#   Medium-High (CD quality): 192k
#   High: 320k

# "Converting an MP3 to a higher bit rate does not add any more
#  audio information to the file, so the sound quality does not

evadecker

# For use with https://github.com/tonistiigi/audiosprite
# and https://github.com/goldfire/howler.js/

# Replace outputNameWithoutExtension with whatever you want.
#
# *.mp3 will find all mp3 files in the current directory.
#
# * will find ALL files in the current directory, allowing you
# to mix wav, mp3, etc into the final combined sprite.

evadecker

# This will overwrite the original file! Be careful!
# I use ZSH. If you use Bash, the syntax will be different here.

# Options:
#   Change -20dB to whatever threshold you consider "silent" to be.

for file in *.mp3; ffmpeg -y -i $file -af silenceremove=1:0:-20dB ${file%.mp3}.mp3

evadecker

# Change 10dB to the amount you'd like to bump the volume.
# You can use negative values to decrease volume, too.

ffmpeg -i input.wav -filter:a "volume=10dB" output.wav

evadecker

# Generate a poster from the first frame
ffmpeg -i input.mp4 -vframes 1 output.png

# Generate a poster from the frame starting at 5 seconds
ffmpeg -i input.mp4 -ss 00:00:05 -vframes 1 output.png

evadecker

ffmpeg -i "input.mov" "output.mp4"

evadecker

# 1 frame per second
ffmpeg -framerate 1 -pattern_type glob -i '*.png' \
  -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4
  
# 30 frames per second
ffmpeg -framerate 30 -pattern_type glob -i '*.png' \
 -i audio.ogg -c:a copy -shortest -c:v libx264 -pix_fmt yuv420p out.mp4