script/ffmpeg.txt at master · alochym01/script · GitHub

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http://journal.code4lib.org/articles/9856

 - for image is not in 16:9 or 4:3. the image should be normalize into 16:9/4:3 first
 - the dimension => 16/9 = 1.7777777(1.78), 4/3 = 1.333333(1.4)

cropping image into height = 90 and width = 120
 ffmpeg -i input.png -vf  "crop=120:90:ih/2:iw/2" input_crop.png
 syntax: ffmpeg -i input.png -vf  "crop=w:h:x:y" input_crop.png
    - width = 120
    - height = 90
    - position horizontal - x
    - position vertical - y

scale image into height = 90 and the width is relative
 ffmpeg -i ngangnhienxayresortkhongphepgiuavuonquocgia.jpeg -vf scale=-1:90 result.jpg

scale image into height is relative and the width = 120
 ffmpeg -i luu-hoang-tai-jpg-1457160278.jpg -vf scale=120:-1 tuoitre.jpg

add the border of image with pad=w:h:x:y
    - the height = 90
    - width is not change
    - the x = 0
    - the y = 10 px
 ffmpeg -i tuoitre.jpg -vf pad=0:90:0:10:black output.jpg
 ffmpeg -i tuoitre.jpg -vf pad=0:90:(width/2):(height/2):black output.jpg -- for center x and y
 ffmpeg -i /home/hadn/script/tuoitre_crawler/tuoitre/1063453/3af2666a.jpg -vf "pad=780:1040:(780-665)/2:(1040-771)/2:black" /home/hadn/script/tuoitre_crawler/tuoitre/1063453/3af2666a_pad_43.jpg
example:
    - the origin image
        Image
        Format                                   : JPEG
        Width                                    : 120 pixels
        Height                                   : 67 pixels
        Color space                              : YUV
        Bit depth                                : 8 bits
        Compression mode                         : Lossy
        Stream size                              : 2.99 KiB (100%)
    - the output image
        Image
        Format                                   : JPEG
        Width                                    : 120 pixels
        Height                                   : 90 pixels
        Color space                              : YUV
        Bit depth                                : 8 bits
        Compression mode                         : Lossy
        Stream size                              : 2.93 KiB (100%)

Cropping syntax
In this chapter, we'll crop the input video to given dimensions.

The command syntax looks like this:

ffmpeg -i before.mp4 -vf "crop=w:h:x:y" after.mp4
The crop filter accepts the following options:

w: Width of the output video (out_w). It defaults to iw. This expression is evaluated only once during the filter configuration.
h: Height of the output video (out_h). It defaults to ih. This expression is evaluated only once during the filter configuration.
x: Horizontal position, in the input video, of the left edge of the output video. It defaults to (in_w-out_w)/2. This expression is evaluated per-frame.
y: Vertical position, in the input video, of the top edge of the output video. It defaults to (in_h-out_h)/2. This expression is evaluated per-frame.