• highly recommanded
• video
  • get audio from video
  • download video
  • convert flv to mp4
  • convert png to mp4
  • scale the media
  • combine video and audio
  • compression mov
  • convert mov to mp4
  • slice video to images
  • convert video to gif
  • convert pngs into gif
  • record a screencast and convert to mpeg
  • tips
• image
  • convert webp to png
  • identity an image
  • convert svg to png
  • convert HEIC/HEIF to PNG
  • sed command to batch change fill and stroke of an SVG
• animation flow chart
  • create animation flow
  • convert svg to gif
• others
  • create manpage pdf
  • save command output to image

highly recommanded

cmd.to

video

get audio from video

[!NOTE|label:references:]

• ffmpeg params:
  • -acodec copy -vn
  • -ab 12800 -ar 44100

$ ffmpeg -i source.mpg -f s16le -acodec pcm_s16le audio.raw

# https://www.commandlinefu.com/commands/view/52/rip-audio-from-a-video-file.
$ mplayer -ao pcm -vo null -vc dummy -dumpaudio -dumpfile <output.file> <input.file>

# or
$ ffmpeg -i file.video file.audio

download video

• download video and extract with sepcific time

  $ yt-dlp --external-downloader ffmpeg --external-downloader-args "-ss 00:05:00 -t 00:01:00" "https://www.youtube.com/watch?v=Y6DGABIcB3w"
  

• convert youtube video to mp3

  $ youtube-dl -t --extract-audio --audio-format mp3 YOUTUBE_URL_HERE
  

convert flv to mp4

$ ffmpeg -i name.flv -qscale 0 name.mp4

convert png to mp4

$ ffmpeg -r 1/5 -i pic-%02d.png -c:v libx264 -r 30 -pix_fmt yuv420p out.mp4

scale the media

$ ffmpeg -i out.mp4 -vf scale=-1:720 out_720p.mp4

convert to 5 mins (300 sec)

$ ffmpeg -i name.mp4 -ss 0 -t 300 name-5m.mp4

sequence convert (every 5 mins ~> 300 secs)

• first 5 mins (0 ~> 300)

  $ ffmpeg -i name.mp4 -ss 0 -t 300 name-5m-1.mp4
  

• second 5 mins (300*1 ~> 300)

  $ ffmpeg -i name.mp4 -ss 300 -t 300 name-5m-2.mp4
  

• third 5 mins (300*2 ~> 300)

  $ ffmpeg -i name.mp4 -ss 600 -t 300 name-5m-3.mp4
  

convert pdf to png

$ convert -density 400 input.pdf pic.png

combine video and audio

$ ffmpeg -i <origin-video> -i <origin-audio> -c copy -map 0:0 -map 1:0 -shortest <new-video>

compression mov

[!NOTE|label:references:]

• Reduce MOV file size

$ ffmpeg -i coc-groovy-lsp.org.mov -c:v libx264 -c:a copy -crf 20 coc-groovy-lsp.mov
$ ls -altrh | grep coc-groovy-lsp
-rw-r--r--   1 marslo staff  37M Jan 15 18:39 coc-groovy-lsp.org.mov
-rw-r--r--   1 marslo staff  10M Jan 15 19:02 coc-groovy-lsp.mov

$ ffmpeg -i coc-groovy-lsp-minirc.org.mov -c:v libx264 -c:a copy -crf 20 coc-groovy-lsp-minirc.mov
$ ls -altrh | grep coc-groovy-lsp-minirc
-rw-r--r--   1 marslo staff  14M Jan 15 19:16 coc-groovy-lsp-minirc.org.mov
-rw-r--r--   1 marslo staff 4.1M Jan 15 19:20 coc-groovy-lsp-minirc.mov

convert mov to mp4

[!NOTE|label:reference:]

• convert .mov video to .mp4 with ffmpeg

# handbrakecli
$ handbrakecli -i {in-video}.mov -e x264 -E facc -o {out-video}.mp4

# ffmpeg
$ ffmpeg -i {in-video}.mov -vcodec h264 -acodec aac {out-video}.mp4
# or
$ ffmpeg -i input.mov -c copy -movflags +faststart output.mp4

slice video to images

$ ffmpeg -i video.mp4 -vf "fps=24" css_%04d.png

convert video to gif

[!NOTE|label:references:]

• How do I convert a video to GIF using ffmpeg, with reasonable quality?
  • options:
    • -ss 30: skip first 30 seconds
    • -t 3: create a 3 second output
    • fps=10: fps filter sets the frame rate
    • scale=320:-1: resize the output to 320 pixels wide and automatically determine the height, the lanczos scaling algorithm is used in this example.
      • scale=0:-1: do not resize
    • split[s0][s1]: split filter will allow everything to be done in one command and avoids having to create a temporary PNG file of the palette
    • [s0]palettegen[p];[s1][p]paletteuse: palettegen and paletteuse filters will generate and use a custom palette generated from your input
  • ffmpeg options:
    • -vf "fps=10,scale=320:-1:flags=lanczos" a filtergraph using the fps and scale filters.
    • -c:v pam: chooses the pam image encoder
    • -f image2pipe: chooses the image2pipe muxer
  • convert options:
    • -delay: set frame rate with a combination of the fps filter in ffmpeg
    • -loop 0: makes infinite loop
    • -layers optimize: enable the general purpose GIF optimizer
  • to set rgb -vf scale=320:-1,format=rgb8,format=rgb24
• ImageMagick Examples -- Animation Optimization
• thevangelist/FFMPEG-gif-script-for-bash

# with specific size
$ ffmpeg -ss 30 -t 3 -i input.mp4 \
         -vf "fps=10,scale=320:-1:flags=lanczos,split[s0][s1];[s0]palettegen[p];[s1][p]paletteuse" \
         -loop 0 output.gif

# or
$ ffmpeg -i input.mp4 -vf "fps=10,scale=320:-1:flags=lanczos" -c:v pam \
         -f image2pipe - | \
         convert -delay 10 - -loop 0 -layers optimize output.gif

# with original size
$ ffmpeg -ss 30 -t 3 -i coc-groovy-minirc.org.mov \
         -vf "fps=35" \
         -loop 0 output.gif

# using ImageMagick
$ convert in.mp4 out.gif

• function

  #### video2gif.sh
  # Convert video to gif file.
  # Usage: video2gif video_file (scale) (fps)
  video2gif() {
    ffmpeg -y -i "${1}" -vf fps=${3:-10},scale=${2:-320}:-1:flags=lanczos,palettegen "${1}.png"
    ffmpeg -i "${1}" -i "${1}.png" -filter_complex "fps=${3:-10},scale=${2:-320}:-1:flags=lanczos[x];[x][1:v]paletteuse" "${1}".gif
    rm "${1}.png"
  }
  
  REM video2gif.bat
  @echo off
  set arg1=%1
  set arg2=%arg1:~0,-4%
  ffmpeg -y -i %arg1% -vf fps=10,scale=-1:-1:flags=lanczos,palettegen %TEMP%\palette.png
  ffmpeg -i %arg1% -i %TEMP%\palette.png -filter_complex "fps=10,scale=-1:-1:flags=lanczos[x];[x][1:v]paletteuse" %arg2%.gif
  del /f %TEMP%\palette.png
  
  # usage
  $ video2gif input.flv
  $ video2gif input.flv 320 10
  

• another simple solution

  src="input.flv"
  dest="output.gif"
  palette="/tmp/palette.png"
  
  ffmpeg -i $src -vf palettegen -y $palette
  ffmpeg -i $src -i $palette -lavfi paletteuse -y $dest
  

• create an animated gif from a youtube video

  $ url=http://www.youtube.com/watch?v=V5bYDhZBFLA;
  youtube-dl -b $url; mplayer $(ls ${url##*=}*| tail -n1) -ss 00:57 -endpos 10 -vo gif89a:fps=5:output=output.gif -vf scale=400:300 -nosound
  

convert pngs into gif

$ convert -delay 5 -loop 0 -dither None -colors 80 "frames/ffout*.png" -fuzz "40%" -layers OptimizeFrame  "output.gif"

# simple version
$ convert -delay 10 *.png sample.gif

record a screencast and convert to mpeg

$ ffmpeg -f x11grab -r 25 -s 800x600 -i :0.0 /tmp/outputFile.mpg

# or: https://www.commandlinefu.com/commands/view/7109/capture-video-of-a-linux-desktop
$ ffmpeg -y -f alsa -ac 2 -i pulse -f x11grab -r 30 -s `xdpyinfo | grep 'dimensions:'|awk '{print $2}'` -i :0.0 -acodec pcm_s16le output.wav -an -vcodec libx264 -vpre lossless_ultrafast -threads 0 output.mp4

# or: https://www.commandlinefu.com/commands/view/5189/capture-video-of-a-linux-desktop
$ ffmpeg -f x11grab -s `xdpyinfo | grep 'dimensions:'|awk '{print $2}'` -r 25 -i :0.0 -sameq /tmp/out.mpg > /root/howto/capture_screen_video_ffmpeg

# or: https://www.commandlinefu.com/commands/view/24389/capture-video-of-a-linux-desktop
$ ffmpeg -video_size 1024x768 -framerate 25 -f x11grab -i :0.0+100,200 output.mp4

# or: https://www.commandlinefu.com/commands/view/12572/capture-video-of-a-linux-desktop
ffmpeg -f x11grab -s wxga -r 25 -i :0.0+1366,0 -qscale 0 /tmp/out.mpg

tips

• get the total length of time

  $ find -type f -name "*.avi" -print0 | xargs -0 mplayer -vo dummy -ao dummy -identify 2>/dev/null | perl -nle '/ID_LENGTH=([0-9\.]+)/ && ($t +=$1) && printf "%02d:%02d:%02d\n",$t/3600,$t/60%60,$t%60' | tail -n 1
  

• edit video by cutting the part you like without transcoding

  $ mencoder -ss <start point> -endpos <time from start point> -oac copy -ovc copy <invid> -o <outvid>
  
  # i.e.: take frames starting at 15.2 seconds for a total of 45.9 seconds
  $ mencoder -ss 15.2 -endpos 30.7 -oac copy -ovc copy origin.avi -o new.avi
  
  # i.e.: total 3m3s length
  $ mencoder -ss 1 minute -endpos 2 minutes 3 seconds -oac copy -ovc copy origin.avi -o new.avi
  

• stream and copy a video from lan

  $ nc HOST PORT | tee movie.mp4 | mplayer -
  
  # via ssh: https://www.commandlinefu.com/commands/view/12955/securely-stream-and-save-a-file-from-a-remote-server
  $ ssh USER@HOST cat REMOTE_FILE.mp4 | tee LOCAL_FILE.mp4 | mplayer -
  

image

convert webp to png

$ ffmpeg -i file.webp out.png

• for multiple images

  $ for x in ls *.webp; do
      ffmpeg -i "$x" "${x%.webp}.jpg"
    done
  

identity an image

$ identify arms009.jpg | grep -o "[[:digit:]]*x[[:digit:]]*" | tail -1
1024x768

convert svg to png

• rsvg-convert

  $ brew install librsvg
  $ rsvg-convert -h 256 file.svg > file.png
  

• qlmanage

  $ qlmanage -t -s 1000 -o . k-1.svg
  

• convert

  $ convert -resize 128x128 input.svg output.png
  
  # or
  $ convert -density 500 -resize 128x128 input.svg output.png
  $ convert -density 1200 -resize 10000x10000 your.svg your.png
  $ convert -background none -size 1024x1024 infile.svg outfile.png
  

• svgexport

  $ npm install svgexport -g
  $ svgexport input.svg output.png 256:256
  

• inkscape

  [!NOTE]

  • Warning: Option --without-gui= is deprecated

  $ brew install inkscape
  $ inkscape --shell -w 256 -h 256 code.svg -o code.png -background none
  
  # or
  $ inkscape -z -w 1024 -h 1024 input.svg -e output.png
  

• imagemagick

  in_size=50
  in_density=96
  out_size=512
  
  magick -density "%[fx:$in_density*$out_size/$in_size]" button.svg button3.png
  

convert HEIC/HEIF to PNG

$ brew install imagemagick --with-libheif

# for single convert
$ magick convert [-monitor] <name>.HEIC <new-name>.png

# for batch convert
$ magick mogrify [-monitor] -format png *.HEIC.

sed command to batch change fill and stroke of an SVG

#!/usr/bin/env sh

COLOR=yellow
sed -i -E 's/fill\="[^"]+"//g; s/stroke\="[^"]+"//g' *.svg
sed -i "s/<path/<path fill=\"$COLOR\" stroke=\"$COLOR\"/g" *.svg

• or

  #!/usr/bin/env sh
  COLOR=yellow
  sed -i -E 's/fill\="[^"]+"//g; s/stroke\="[^"]+"//g' *.svg
  sed -i "s/<path/<path fill=\"$COLOR\" stroke=\"$COLOR\"/g" *.svg
  sed -i "s/<rect/<rect fill=\"$COLOR\" stroke=\"$COLOR\"/g" *.svg
  sed -i "s/<polygon/<polygon fill=\"$COLOR\" stroke=\"$COLOR\"/g" *.svg
  sed -i "s/<circle/<circle fill=\"$COLOR\" stroke=\"$COLOR\"/g" *.svg
  sed -i "s/<ellipse/<ellipse fill=\"$COLOR\" stroke=\"$COLOR\"/g" *.svg
  sed -i "s/<polyline/<polyline fill=\"$COLOR\" stroke=\"$COLOR\"/g" *.svg
  sed -i -E "s/stroke\:[^\;]+/stroke\:$COLOR/g" *.svg
  sed -i -E "s/fill\:\#[0-9]+/fill\:$COLOR/g" *.svg
  

animation flow chart

create animation flow

[!NOTE|label:references:]

• #3739 - Export as a GIF
• 如何用drawio让自己的流程图线条产生动起来的效果
• processflow.sharehoo.cn

• draw.io

  

• export to svg

  

convert svg to gif

• online tools

  [!NOTE|label:references:]

  • Convert animated SVG to GIF free

  • convert svg to gif with watermark in html5animationtogif.com

    • increase the SVG image height to make the watermark shows below of original image

    

    

• crop the watermark in animated GIF editor and Gif maker

  

• local tools

  • chrome extension: Chrome Capture - screenshot & GIF
  • desktop application: GIF Brewery: .045s, 0.50s or 0.52s
    • GIF Brewery for Mac v3.9.5 英文破解 GIF制作工具
      • 提取码: iasr
    • Gifox

others

create manpage pdf

$ man -t manpage | ps2pdf - filename.pdf

# https://www.commandlinefu.com/commands/view/9751/save-man-page-as-pdf
$ man -t awk | ps2pdf - awk.pdf

save command output to image

$ ifconfig | convert label:@- ip.png
# or: https://www.commandlinefu.com/commands/view/18168/save-command-output-to-image
$ convert label:"$(ifconfig)" output.png

# and more
$ ifconfig | convert -background none label:@- miff:- | composite -tile pattern:checkerboard - -compose Dst_Over ip.png

# and more with fonts: `convert -list font | grep Font:`
$ /usr/bin/lynx -dump -nolist http://www.commandlinefu.com/ | /usr/bin/convert -font "FreeMono-Medium" label:@- output.png