One-liners

Audio/visual

Best FLAC

$ flac --best --delete-input-file --keep-foreign-metadata --preserve-modtime --verify "$AUDIO"

Best MP3 with CBR

$ lame -b 320 -q 0 --cbr "$AUDIO"

Best MP3 with VBR

$ lame -b 320 -q 0 -V 0 "$AUDIO"

Fade image to white background

$ convert $1 -alpha on -channel a -evaluate set 20% out.png

Flip image horizontally

$ convert $IMAGE -flop $OUTPUT

Flip image vertically

$ convert $IMAGE -flip $OUTPUT

Increase video volume

$ ffmpeg -i "$VIDEO" -filter:a "volume=4.0" "out.$VIDEO"

Merge incomplete yt-dlp

$ ffmpeg -i "$VIDEO" -i "$AUDIO" "$OUT.mp4" && AtomicParsley "$OUT.mp4" --artwork "$THUMB.png"

Optimal PNG

$ pngcrush -blacken -check -fix -oldtimestamp -ow -reduce -speed -v "$IMG"

Retina/2x HiDPI export

$ convert -units PixelsPerInch -density 192 "$TARGET"

Remove EXIF data

$ exiftool -all= "$TARGET"

Rotate video counter-clockwise

$ ffmpeg -i "$VIDEO" -vf 'transpose=3' -c:a copy "out.$VIDEO"

Rotate video clockwise

$ ffmpeg -i "$VIDEO" -vf 'transpose=1' -c:a copy "out.$VIDEO"

Storage

Basic fio(1) read/write test

$ fio --randrepeat=1 --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randrw --rwmixread=75

Basic fio(1) read test

$ fio --randrepeat=1 --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randread

Basic fio(1) write test

$ fio --randrepeat=1 --direct=1 --gtod_reduce=1 --name=test --filename=test --bs=4k --iodepth=64 --size=4G --readwrite=randwrite