ffmpeg create blank screen with text video

问题:

I would like to create a video consisting of some text. The video will only be 0.5 seconds long. The background should just be some colour, I am able to create such video from a photo, but cant find anywhere how this could be done without a photo, just using text to create such video.

Can you help me ? Thanks in advance

回答1:

Add text to solid color background

Use the color video source filter and the drawtext video filter.

ffmpeg -f lavfi -i color=c=blue:s=320x240:d=0.5 -vf \
"drawtext=fontfile=/path/to/font.ttf:fontsize=30: \
 fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:text='Stack Overflow'" \
output.mp4

• The d=0.5 will make a 0.5 second duration output.
• See the list of supported color names and how to use a hex code to set color.

With a transparent box behind text

Another example with a white box behind the text at 25% opacity with 5 pixel padding:

ffmpeg -f lavfi -i color=c=red:s=320x240:d=0.5 -vf \
"drawtext=fontfile=/path/to/font.ttf:fontsize=30: \
 box=1:boxborderw=5:boxcolor=white@0.25: \
 fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:text='Stack Overflow'" \
output.mp4

Multiple lines

_{It's easier to center the two lines with multiple drawtext instances (left image). Right image is from the external file and line break examples.}

You can chain together two drawtext filters, or reference an external text file with the textfile option, or add the line break in the command.

Multiple drawtext instances

ffmpeg -f lavfi -i color=c=green:s=320x240:d=0.5 -vf \
"drawtext=fontfile=/path/to/font.ttf:fontsize=30:fontcolor=white:x=(w-text_w)/2:y=(h-text_h-text_h)/2:text='Stack', \
 drawtext=fontfile=/path/to/font.ttf:fontsize=30:fontcolor=white:x=(w-text_w)/2:y=(h+text_h)/2:text='Overflow'" \
output.mp4

External text file

The contents of the text file, text.txt, looks like this:

Stack
Overflow

The ffmpeg command:

ffmpeg -f lavfi -i color=c=green:s=320x240:d=0.5 -vf \
"drawtext=fontfile=/path/to/font.ttf:fontsize=30: \
 fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:textfile=text.txt" \
output.mp4

Line break in command

ffmpeg -f lavfi -i color=c=green:s=320x240:d=0.5 -vf \
"drawtext=fontfile=/path/to/font.ttf:fontsize=30: \
fontcolor=white:x=(w-text_w)/2:y=(h-text_h)/2:text='Stack
Overflow'" \
output.mp4

Output image instead of video

If you want an image output instead replace output.mp4 with -frames:v 1 output.png.

Alternative method

Using the subtitles filter is another method to do this.