Create centered, transparent text watermark
E.g For creating access copies with your institutions name
-
ffmpeg -i input_file -vf drawtext="fontfile=font_path:fontsize=font_size:text=watermark_text:fontcolor=font_colour:alpha=0.4:x=w/2-tw/2:y=h/2-th/2" output_file
+
ffmpeg -i input_file -vf drawtext="fontfile=font_path:fontsize=font_size:text=watermark_text:fontcolor=font_colour:alpha=0.4:x=(w-text_w)/2:y=(h-text_h)/2" output_file
- ffmpeg
- starts the command
- -i input_file
- path, name and extension of the input file
- -vf drawtext=
- This calls the drawtext filters with the following options:
- - fontfile=font_path
- Set path to font. For example in OSX:
"fontfile=/Library/Fonts/AppleGothic.ttf"
+ - fontfile=font_path
- Set path to font. For example in OSX:
fontfile=/Library/Fonts/AppleGothic.ttf
- fontsize=font_size
- Set font size.
35 is a good starting point for SD. Ideally this value is proportional to video size, for example use ffprobe to acquire video height and divide by 14.
- - text=watermark_text
- Set the content of your watermark text. For example:
"text="FFMPROVISR HACK DAY NEVAR ENDS"
- - fontcolor=font_colour
- Set colour of font. Can be a text string such as
"fontcolor=white" or a hexadecimal value such as "fontcolor=0xFFFFFF"
+ - text=watermark_text
- Set the content of your watermark text. For example:
text='FFMPROVISR HACK DAY NEVAR ENDS'
+ - fontcolor=font_colour
- Set colour of font. Can be a text string such as
fontcolor=white or a hexadecimal value such as fontcolor=0xFFFFFF
- alpha=0.4
- Set transparency value.
- - x=w/2-tw/2:y=h/2-th/2
- Sets x and y coordinates for the watermark. These relative values will centre your watermark regardless of video dimensions.
+ - x=(w-text_w)/2:y=(h-text_h)/2
- Sets x and y coordinates for the watermark. These relative values will centre your watermark regardless of video dimensions.
- output_file
- path, name and extension of the output file.