Media file analysis, editing, transcoding and conversions.
From DevOps-Bash-tools repo, determines whatever tool is available on either Linux or Mac and uses that to open the image file:
imageopen.sh "$filename"medium.com doesn't support using newer webp format images on the site so you need to convert them first:
On Mac, install the Imagemagick or Webp homebrew packages:
brew install imagemagickor
brew install webpConvert the image using ImageMagick:
magick "$name.webp" "$name.png"or using dwebp:
dwebp "$name.webp" -o "$name.png"or more simply use this script in DevOps-Bash-tools repo which will find / install and use one of the above tools, and protect against overwriting:
webp_to_png.sh "$name.webp"You can also inspect the webp header like this:
webpinfo "$name.webp"Many major websites like LinkedIn, Medium and Reddit do not accept SVG images so you must convert to another supported format like PNG.
Using ImageMagick:
convert "$name.svg" "$name.png"or using Inkscape (slower than ImageMagick):
inkscape "$name.svg" --export-filename="$name.png"or using rsvg-convert:
rsvg-convert "$name.svg" -o "$name.png"or more simply use this script in DevOps-Bash-tools repo which will find / install and use one of the above tools and protect against overwriting:
svg_to_png.sh "$name.svg"You can use Imagemagick to do this from the command line more easily than using Gimp etc.
The output image must come at the end.
magick "$image" -gravity East -chop 2x0 "$output_image"-gravity East tells it to keep to the left - like driving in the UK!
Useful to create memes.
Since images can have different widths and end up with whitespace around the smaller image, use this script from the DevOps-Bash-tools repo to joins them after matching their heights or widths so they align correctly:
image_join_vertical.sh "$top_image" "$bottom_image" "joined_image.png"image_join_horizontal.sh "$left_image" "$right_image" "joined_image.png"exiftool "$file"Identify command from imagemagick is more verbose:
identify -verbose "$file"Exiv2 is less reliable:
exiv2magick "$file" -edge 1 output.jpgThen visually inspect the output.jpg which is blacked out to see sillouttes more easily.
You can also try converting to black & white (grey):
magick "$file" -channel Red -separate output.jpgThis on only works if you've hidden something inside the image and know the password to extact it:
steghide info "$file"Looks like this is removed from Mac Homebrew, launch it in a debian docker container instead:
steghide extract -sf "$file"ffmpeg -i "$file"or
ffprobe "$file"ffmpeg -i "input.mkv" "output.mp4"There is an automated script in the DevOps-Bash-tools repo's media/ directory to iterate many files easily:
mkv_to_mp4.sh *.mkvor find all mkv files recursively under the given directory and convert them (retains originals), in this case the $pwd denoted by a dot:
mkv_to_mp4.sh .Create a clip from a video file using ffmpeg args:
-ss <offset>and-to <duration>where duration is integer seconds orHH:MM:SSformat-c copy--cspecifies codec,copyis quick and cheap codec compared to transcoding
ffmpeg -i input_vid.mp4 -ss 00:08:35.0 -t 72 -c copy output_vid.mp4or using time format -to 00:01:12 which is the same as 72 seconds from offset start.
ffprobe $fileexiftool $filemediainfo $filemediainfo --fullscan $fileavprobe $filemplayer -vo null -ao null -identify -frames 0 $filetovid id $fileUse the id3v2 program to set metadata on mp3 files.
Useful to group a bunch of mp3 files for an audiobook.
Set the --author / -a and --album / -A tags at once so Mac's Books.app groups them properly into one audiobook:
id3v2 -a "MyAuthor" -A "MyAlbum" *.mp3The scripts mp3_set_artist.sh and mp3_set_album.sh in the DevOps-Bash-tools repo's media/
directory make it slightly easier.
Set the --track number for each mp3 file, so they play in the right order:
i=0
for x in *.mp3; do
((i+=1))
id3v2 -T $i "$x"
doneThe scripts mp3_set_track_order.sh and mp3_set_track_name.sh in the DevOps-Bash-tools repo's media/
directory make this slightly easier.
Recursively set Artist/Album - XXX: Danger, use only in an audiobook subdirectory, otherwise it'll ruin the metadata of your MP3 library!
find . -maxdepth 2 -iname '*.mp3' |
{
i=0
while read mp3; do
((i+=1))
id3v2 -a "MyAuthor" -A "MyAlbum" "$mp3"
done
}Recursively set Track Order - for subdirectories eg. CD1, CD2 etc... XXX: use with care - misused at the top it'd ruin your MP3 library's metadata:
find . -maxdepth 2 -iname '*.mp3' |
{
i=0
while read mp3; do
((i+=1))
id3v2 -T $i "$mp3"
done
}This is old from 2010 and probably needs some updates:
aptitude install nvidia-glx-173
aptitude -y purge samba
aptitude -y purge bluez bluetooth gnome-bluetooth bluez-utils
aptitude -y purge cups bluez-cups cups-driver-gutenprint foo2zjs foomatic-db foomatic-db-engine ghostscript-cups hpijs hplip openprinting-ppds pxljr splix
apt-get -y purge evolution evolution-common
aptitude -y purge openssh-server
dpkg -l | grep openoffice | awk '{print $2}' | xargs aptitude -y purge language-support-en language-support-writing-en python-unoaptitude -y install sysstat
aptitude -y install unraraptitude -y install libdvdread4
/usr/share/doc/libdvdread4/install-css.shas root:
mkdir /var/run/lirc # it wouldn't create it and it wouldn't start without it on ubuntuaptitude -y install dvb-utilsCyberlink remote shows us as /dev/input/event3 according to google.
Can cat that or after installing dvb-utils, can do:
evtest /dev/input/event3except dvb-utils has no install candidate and tells you to instead get dvb-apps which is already installed and doesn't have evtest, only the c file for it
less /proc/bus/input/devicesremote control is detected as a keyboard so a bunch of stuff just works out of the box.
Should use xmodmap to add the remaining buttons to do things I want
Ported from private Knowledge Base pages 2010+