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Full Discussion: Change size of watermark
Top Forums UNIX for Advanced & Expert Users Change size of watermark Post 303034435 by locoroco on Thursday 25th of April 2019 03:54:51 PM
Old 04-25-2019
Answering my own question. Here I have chosen to scale from height. It is also possible to scale from width.



Code:
height=$(ffprobe -v quiet -show_entries stream=width,height -of default=noprint_wrappers=1 $filename | awk -F '=' '/height/{print $2}')
ffmpeg -i watermark2.png -y -v quiet -vf scale=$height*0.25:-1 scaled.png       #scale watermark
ffmpeg -i $filename -i scaled.png -filter_complex overlay=15:15 output.png      #add watermark

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IMAGECREATE(3)								 1							    IMAGECREATE(3)

imagecreate - Create a new palette based image

SYNOPSIS
resource imagecreate (int $width, int $height) DESCRIPTION
imagecreate(3) returns an image identifier representing a blank image of specified size. In general, we recommend the use of imagecreatetruecolor(3) instead of imagecreate(3) so that image processing occurs on the highest qual- ity image possible. If you want to output a palette image, then imagetruecolortopalette(3) should be called immediately before saving the image with imagepng(3) or imagegif(3). PARAMETERS
o $width - The image width. o $height - The image height. RETURN VALUES
Returns an image resource identifier on success, FALSE on errors. EXAMPLES
Example #1 Creating a new GD image stream and outputting an image. <?php header("Content-Type: image/png"); $im = @imagecreate(110, 20) or die("Cannot Initialize new GD image stream"); $background_color = imagecolorallocate($im, 0, 0, 0); $text_color = imagecolorallocate($im, 233, 14, 91); imagestring($im, 1, 5, 5, "A Simple Text String", $text_color); imagepng($im); imagedestroy($im); ?> The above example will output something similar to:[NOT DISPLAYABLE MEDIA]Output of example : Creating a new GD image stream and outputting an image. SEE ALSO
imagedestroy(3), imagecreatetruecolor(3). PHP Documentation Group IMAGECREATE(3)
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