Generate smptebars with test text on top

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https://www.ffmpegbyexample.com/video/16x9.jpg

Use the smptebars video filter generator to generate an SMPTE test source. With the simple video input in place, use the drawtext filter to render the text ‘16x9’ and place it in the middle of the frame.

For more info, see smptebars and drawtext on the official ffmpeg documentation.

ffmpeg -f lavfi -i "smptebars=s=640x360" -vf drawtext="fontsize=220:text='16x9':x=(w-text_w)/2:y=(h-text_h)/2:fontcolor=White" -frames:v 1 -qscale:v 1 16x9.jpg