ravijo / image-video-editing

This repository contains commands for beginner level image and video editing in Ubuntu OS.

Image and Video Editing

This repository contains commands for beginner level image and video editing in Ubuntu OS.

Tools Required

1. ImageMagick
2. ffmpeg

Install ImageMagick on Ubuntu 14.04

1. Open the terminal or press CTRL+ALT+T
2. Run following command sudo apt-get install imagemagick

Install FFmpeg on Ubuntu 14.04

1. Use PPA. Open the terminal or press CTRL+ALT+T
2. Run following commands-

   sudo add-apt-repository ppa:mc3man/trusty-media
   sudo apt-get update
   sudo apt-get install ffmpeg gstreamer0.10-ffmpeg

Image Editing

Resizing

Resizing can be done in following ways-

• Provide the height and width in pixel convert input.png -resize 800x600 output.png
• The above command preserves the aspect ratio. If you want to force the image to become exactly specific size, add exclamation mark like this convert input.png -resize 800x600! output.png
• By providing width only and keeping the aspect ratio preserve convert input.png -resize 800 output.png
• By providing height only and keeping the aspect ratio preserve convert input.png -resize x600 output.png
• By providing percentage such as convert input.png -resize 50% output.png

Crop Image

convert input.jpg -crop 640x620+0+0 output.jpg

Convert PNG to JPG

• Convert PNG to JPG by specifing the compression level using following command

convert input.png -quality 95 output.jpg

Remove Image Metadata

mogrify -strip *.jpg

Convert HEIC image to JPG

for file in *.HEIC; do heif-convert $file ${file%.HEIC}.jpg; done

Add Text on Image

convert -font helvetica -fill white -pointsize 40 -gravity north \
    -draw "text 0,100 'TEXT TO BE DISPLAYED'" input.jpg output.jpg

convert -font helvetica -undercolor white -fill black -pointsize 40 \
    -gravity northwest -draw "text 0,0 'TEXT TO BE DISPLAYED'" input.jpg output.jpg

Increase Brightness on Image

mogrify -brightness-contrast 10  *.JPG

Video Editing

Crop

• Command syntax ffmpeg -i input.mp4 -filter:v "crop=out_w:out_h:x:y" output.mp4. For example To crop a 80x60 section, starting from position (200, 100) use the following command:

ffmpeg -i input.mp4 -filter:v "crop=80:60:200:100" -c:a copy output.mp4

Preview

It is better to check the preview before cropping a video.

ffplay -i input.mp4 -vf "crop=80:60:200:100"

# Use following, if above command says "ffplay: command not found" 
ffmpeg.ffplay -i input.mp4 -vf "crop=80:60:200:100"

Cut

• A part in between

  ffmpeg -i input.mp4 -ss 00:00:03 -to 00:00:16 -c copy output.mp4

• From beginning

  ffmpeg -i input.mp4 -t 00:00:30 -c copy output.mp4

Reduce Size

• By decreasing frame rate 30 frames/sec ffmpeg -i input.mp4 -r 30 output.mp4
• By resizing video ffmpeg -i input.avi -vf scale=1024:-1 output.avi
• By decreasing video bit rate use a bitrate of 64kb/sec ffmpeg -i input.mp4 -b:v 64k output.mp4

Convert MOV to MP4

ffmpeg -i input.mov -q:v 0 output.mp4
ffmpeg -i input.mov -vcodec h264 -acodec mp2 output.mp4

Remove Audio from Video

ffmpeg -i input.mp4 -c copy -an output.mp4 

Add Text on Video

ffmpeg -i input.mp4 -vf "drawtext=:text='Stack Overflow':\
    fontcolor=white:fontsize=50:box=1:boxcolor=black@0.5:\
    boxborderw=5:x=(w-text_w)/2:y=(h-text_h)/2" -codec:a copy output.mp4

Place Two Videos Side-by-Side

ffmpeg -i left.mp4 -i right.mp4 -filter_complex hstack output.mp4

Concatenate Videos

$ cat mylist.txt
file '/path/to/file1'
file '/path/to/file2'
file '/path/to/file3'
    
$ ffmpeg -f concat -safe 0 -i mylist.txt -c copy output.mp4

Convert PDF to JPEG

convert -density 600 input.pdf -quality 90 -background white -alpha remove output.jpg

Create EPS from Latex

latex input.tex
dvips -o output.eps input.dvi 

Gif from Video

• Normal mode:

  ffmpeg -i input.mp4 output.gif

• Advance mode:

  ffmpeg -y -i input.mp4 -vf palettegen palette.png
  ffmpeg -y -i input.mp4 -i palette.png -filter_complex paletteuse \
      -r 10 -s 320x480 output.gif

Reduce Gif Size

mogrify -layers 'optimize' -fuzz 7% file.gif

References

The above information is taken from various sources such as following-

• Video Stackexchange
• Unix Stackexchange
• Stackoverflow
• FFmpeg
• Reduce Gif Size
• FFmpeg with Palette
• Mov2Mp4
• Mov2Mp4
• Remove Audio from Video
• Convert Heic to Jpg
• Add Text on Video
• Add Text on Image
• Preview Video
• Increase Brightness on Image
• Crop Image
• Place Two Videos Side-by-Side
• Cut Video from Beginning
• Concatenate Videos