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ffmpeg

Converting Audio into Different Formats / Sample Rates

Minimal example: transcode from MP3 to WMA:
ffmpeg -i input.mp3 output.wma

You can get the list of supported formats with:
ffmpeg -formats

You can get the list of installed codecs with:

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QLab + Applescript commands for Projector & Application Boot-Up/Shut-Down Routine

Boot Up Sequence

Open Projector Manager app

tell application "Terminal"
   delay 0.5
   do script "open -a Projector Manager"
   delay 0.5
   tell application "Terminal to quit"
end tell

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Each YouTube video has 4 generated images. They are predictably formatted as follows:

http://img.youtube.com/vi/<insert-youtube-video-id-here>/0.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/1.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/2.jpg
http://img.youtube.com/vi/<insert-youtube-video-id-here>/3.jpg

The first one in the list is a full size image and others are thumbnail images. The default thumbnail image (ie. one of 1.jpg, 2.jpg, 3.jpg) is:

http://img.youtube.com/vi/<insert-youtube-video-id-here>/default.jpg

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Download Only Certain File Types Using wget -r -A

You can use this under following situations:

• Download all images from a website
• Download all videos from a website
• Download all PDF files from a website

$ wget -r -A.pdf http://url-to-webpage-with-pdfs/

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Install ImageMagick

brew install ImageMagick

Pull specific region of frames from video file w/ ffmpeg

ffmpeg -ss 14:55 -i video.mkv -t 5 -s 480x270 -f image2 %04d.png

• -ss 14:55 gives the timestamp where I want FFmpeg to start, as a duration string.
  
• -t 5 says how much I want FFmpeg to decode, using the same duration syntax as for -ss.
  
• -s 480x270 tells FFmpeg to resize the video output to 480 by 270 pixels.
  
• -f image2 selects the output format, a series of still images — make sure there are leading zeros in filename.
  

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Renoise 3.0

Keyboard Shortcuts OS X 10.10.5

play from playhead position
shift space bar

toggle FOLLOW in pattern view [custom keybinding]
option esc

toggle global loop [custom keybinding]

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youtube-dl will output in the current directory

To list available formats

youtube-dl --list-formats URL

To download an entire user/channel

youtube-dl -citw ytuser:<USER> or

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using rsync

$ rsync -avE --progress /source/ /destination

• -v --verbose
• -a --archive (preserve all attributes)
• -n --dry-run
• -E, --executability (preserve executability)
• --delete This tells rsync to delete extraneous files from the receiving side (files that aren't on the sending side), but only for the directories that are being synchronized.

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quick/dirty process to merge audio streams

create initial video offset
ffmpeg -ss 0:00 -t 0:00 -i input.mp4 output.mp4

exctract audio from new output.mp4
ffmpeg -i output.mp4 -f mp3 -ab 192000 -vn output.mp3

merge the two audio files
ffmpeg -i output.mp3 -i audio2.mp3 -filter_complex amerge -ac 2 -c:a libmp3lame -q:a 4 merged.mp3

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$ img2pdf --first-frame-only *.jpg -o document.pdf