tehn

i have too many websites but you may be particularly interested in:

WORDS

yt-dlp

downloads video and audio from youtube. see github.com/yt-dlp/yt-dlp for the readme.

# video download, default settings:
yt-dlp [url]

# audio only, best quality:
yt-dlp -x -f "bestaudio" --audio-format mp3 $@

mpv

plays back audio and video from terminal.

# hotkeys
#
# q		quit
# p		pause
# m		mute
# [ ]		decrease/increase playback speed

sox

convert, edit, and process audio files.

# get info on file
soxi [file]

# audio info
sox [file] -n stat

# convert wav to mp3
sox [file.wav] [file.mp3]

# normalize to -0.1
sox [input-file] [output-file] norm -0.1

# convert to 48k sampling rate
sox [input-file] [output-file] rate 48k

# trim
sox [input-file] [output-file] trim [start-sec] [length-sec]

# combine files
sox -m [first-file] [second-file] [output-file]

# stereo file to two mono files
sox [input-file] [output-file-l] remix 1
sox [input-file] [output-file-r] remix 2

# two mono files to stereo
sox -M [input-file-l] [input-file-r] [output-file]

# half-speed
sox [input-file] [output-file] speed 0.5

ffmpeg

convert, edit, and process video (and audio) files

# mp4 to webm
ffmpeg -i input.mp4 -c:v libvpx-vp9 -crf 30 -b:v 0 -b:a 128k -c:a libopus output.webm

# compress video
ffmpeg -i input.mp4 -vcodec libx265 -crf 28 output.mp4

# cut region video
ffmpeg -ss 00:01:00 -to 00:02:00 -i input.mp4 -c copy output.mp4

# slow down audio
ffmpeg -i input.mp3 -af atempo=0.83 output.mp3

# encoder wav to mp3
ffmpeg -i input.wav -b:a 320k output.mp3

SPELLS

for

# encoder a folder of waves to mp3
for file in *.wav; do ffmpeg -i $file -ar 44100 -b:a 320k ${file%.*}.mp3; done

last edit: 02/29/2024